Дисертації з теми "Rubber Blends"
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Lewan, Michael Victor. "Crosslink density distributions in natural rubber/nitrile rubber blends." Thesis, Loughborough University, 1995. https://dspace.lboro.ac.uk/2134/32972.
Повний текст джерелаChoi, Jaesun. "Ultrasonically Aided Extrusion of Rubber Nanocomposites and Rubber Blends." University of Akron / OhioLINK, 2013. http://rave.ohiolink.edu/etdc/view?acc_num=akron1362747207.
Повний текст джерелаHuynh, Anh Nhut Materials Science & Engineering Faculty of Science UNSW. "Rubber-polymer blends: a thesis in polymer engineering." Awarded by:University of New South Wales. Materials Science & Engineering, 2007. http://handle.unsw.edu.au/1959.4/40833.
Повний текст джерелаEgodage, Shantha M. "The development of rubber-thermoplastic blends from ground tyre rubber and waste polypropylene." Thesis, Loughborough University, 2008. https://dspace.lboro.ac.uk/2134/36154.
Повний текст джерелаEuchler, Eric, Radek Stocek, Michael Gehde, Jörg-Michael Bunzel, Wolfgang Saal, and Reinhold Kipscholl. "Fracture behavior of rubber powder modified rubber blends applied for conveying belt top covers." Universitätsbibliothek Chemnitz, 2016. http://nbn-resolving.de/urn:nbn:de:bsz:ch1-qucosa-198136.
Повний текст джерелаEuchler, Eric, Radek Stocek, Michael Gehde, Jörg-Michael Bunzel, Wolfgang Saal, and Reinhold Kipscholl. "Fracture behavior of rubber powder modified rubber blends applied for conveying belt top covers." Technische Universität Chemnitz, 2014. https://monarch.qucosa.de/id/qucosa%3A20409.
Повний текст джерелаGoktas, Ahmet. "Electrospinning Of Polystyrene/butly Rubber Blends: A Parametric Study." Master's thesis, METU, 2008. http://etd.lib.metu.edu.tr/upload/12609361/index.pdf.
Повний текст джерела(i) an AC/DC high voltage equipment which creates high electrical potential, (ii) a syringe, and (iii) a collecting screen. The purpose of this study is to electrospin polystyrene/butyl rubber blends and to investigate the effects of electrospinning parameters on the fibers produced. In this study, polystyrene/butyl rubber blends were electrospun by changing the applied voltage, the tip-to-collector distance, the flowrate, and the butyl rubber content in the fiber. Finally, morphology of electrospun fibers was characterized by SEM. The average fiber diameters varied from 760 nm to nearly 10 µ
m. Increasing butyl rubber content in the fiber resulted in a decrease in the final fiber diameter. Increasing applied voltage also caused a decrease in the final fiber diameter. The tip-to-collector distance did not affect the average fiber diameter. Increasing flowrate yielded fibers with larger diameters. Finally, the addition of non-ionic surfactant decreased the average fiber diameter.
Sagoo, P. S. "Vapour transport in natural rubber blends and graft copolymers." Thesis, Imperial College London, 1985. http://hdl.handle.net/10044/1/37842.
Повний текст джерелаBussi, Philippe Jacques. "Dynamic mechanical properties of epoxy resin/epoxidized rubber blends." Case Western Reserve University School of Graduate Studies / OhioLINK, 1993. http://rave.ohiolink.edu/etdc/view?acc_num=case1060697951.
Повний текст джерелаTaksapattanakul, Korn. "Thermoplastic Vulcanizates Based on Hydrogenated Natural Rubber/Polypropylene Blends." Thesis, Le Mans, 2016. http://www.theses.fr/2016LEMA1028/document.
Повний текст джерелаThe non-catalytic hydrogenation of natural rubber latex (NRL) was carried out by using diimide generated in situ from the reaction between hydrazine (N2H4) and hydrogen peroxide (H2O2). The effects of mole ratios of [C=C]:[N2H4]:[H2O2], reaction conditions, solvent types, solvent volumes and reaction scale-up on the hydrogenation levels were investigated. Nuclear magnetic resonance (NMR), Fourier transform infrared (FTIR), and Raman spectroscopic techniques were employed to investigate the chemical structure of the hydrogenated natural rubber (HNRs) and to quantify the hydrogenationlevels. It was found that variations in moles of N2H4 and H2O2 in the range of 1.0-2.0 moles resulted in degrees of hydrogenation in the range of 10-18%. Little improvement in hydrogenation levels of HNRs was obtained when NRL particles were swollen in solvents by which toluene yielded better results than hexane. The increase in toluenevolume resulted in the increase in hydrogenation levels up to 42 %. TEM micrographs revealed that swelling mainly occurred at the surface of NRL particles, implying that hydrogenation reaction confined largely at the surface of NRL particles. After removal of toluene, particle size and particle size distribution of partially hydrogenated NRL remained unchanged. To further improve degrees of hydrogenation, the reaction volume was extended and 65% hydrogenation levels were obtained. Therefore, 14%HNR, 33%HNR, and 65%HNR were successfully prepared under suitable reaction conditions. However, crosslinking and cis-trans isomerization were side-reactions occurring during hydrogenation. Gel and trans contents increased with increasing hydrogenation levels, leading to the increase in hardness of HNRs. Mooney viscosities of HNRs increased with increasing degrees of hydrogenation due to the increased gel contents. Mooney torquerelaxation of NR and HNRs were similar. Thermogravimetric analysis revealed that vi HNRs had greater thermal stability than NR and thermal stability increased with increasing degrees of hydrogenation. HNR vulcanizates were much better resistant to ozone and UV than cured NR. Sulfur-vulcanized rubbers had greater ozone resistance than peroxide-cure rubbers due to less amounts of carbon-carbon double bonds present in rubbers. In addition, modulus at low strain and tensile strength of sulfur-cured rubbers were higher than those of peroxide-cured rubbers, but lower elongation due to higher crosslink densities. Also, modulus at low strain and tensile strength increased with increasing hydrogenation levels of HNRs, in contrast to strain at break. Thermoplastic vulcanizates (TPVs) from blends of HNR and Polypropylene (PP) were prepared via dynamic vulcanization using peroxide and sulfur as curing agents. The effects of blend ratios on mechanical properties of TPVs were investigated. Tensile strength increased with increasing PP portions, but breaking strain decreased. Morphology of TPVs was characterized with Raman mapping and scanning electron microscope (SEM). The phase sizes of crosslinked rubber obtained from both techniques were correlated well
Whiteman, David James. "The physical chemistry of stabilising additives in rubber toughened polyolefins." Thesis, University of Sussex, 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.285136.
Повний текст джерелаGuo, Yuelei. "INVESTIGATION OF SILICONE RUBBER BLENDS AND THEIR SHAPE MEMORY PROPERTIES." University of Akron / OhioLINK, 2018. http://rave.ohiolink.edu/etdc/view?acc_num=akron1525982588046477.
Повний текст джерелаLinares, Elisangela Moura. "Caracterização microestrutural de filmes de blendas de latex." [s.n.], 2009. http://repositorio.unicamp.br/jspui/handle/REPOSIP/250299.
Повний текст джерелаDissertação (mestrado) - Universidade Estadual de Campinas, Instituto de Quimica
Made available in DSpace on 2018-08-14T14:09:30Z (GMT). No. of bitstreams: 1 Linares_ElisangelaMoura_M.pdf: 5164980 bytes, checksum: d9e4505544f0a48a985e78fccc9e1832 (MD5) Previous issue date: 2009
Resumo: Este trabalho mostra o efeito da distribuição de espécies iônicas na morfologia e nas propriedades mecânicas de filmes de blendas de látices, e também demonstra o uso da técnica de microscopia eletrônica de transmissão por energia filtrada (EFTEM) para caracterização morfológica das blendas e de seus nanocompósitos com argila, explorando a região de baixa perda de energia de elétrons. Blendas de látex de borracha natural (NR)/poli(estireno-acrilato de butila) [P(S-BA] e NR/poli(cloreto de vinila) [PVC] foram investigadas, utilizando-se microscopia de varredura de potencial elétrico (SEPM). Através dos mapas de potencial elétrico, foi verificada a ocorrência de migração de espécies iônicas da blenda de uma fase polimérica para a outra, durante a preparação da blenda. Esta migração é espontânea, porque permite a redução da energia do sistema através da diminuição da repulsão eletrostática entre íons, distribuindo-os entre as fases, e é direcionada para o polímero que inicialmente tem menor concentração de cargas e apresenta maior constante dielétrica. Os domínios formados pelos dois componentes da blenda apresentam sinais de carga opostos, o que contribui para o aumento na compatibilidade, através da adesão eletrostática. Os espectros de baixa perda de energia mostram diferenças nas estruturas moleculares dos polímeros das blendas. Essas diferenças se expressam através de mudanças de contraste em imagens de perda de energia (mapas moleculares) adquiridas entre 20 e 90 eV. Blendas de NR/P(S-BA), P(S-BA)/PVC, P(S-BA)/poli(estirenometacrilato de 2-hidroxietila) e seus respectivos nanocompósitos foram analisados por EFTEM que revelou domínios em escala nanométrica, mesmo tendo pequenas diferenças na composição química, sem a necessidade de corar a amostra. Nos nanocompósitos, a disposição das lamelas de argila foi revelada graças ao cancelamento do contraste entre os polímeros.
Abstract: This work shows the effect of ionic specie distribution on the morphology and on the mechanical properties of latex blend films, as well as it demonstrates the use of energy-filtered transmission electron microscopy (EFTEM) technique to morphological characterization of these blends and its clay nanocomposites, by exploring the low-loss electron energy region. Natural rubber (NR)/poly(styrenebutyl acrylate) [P(S-BA)] and NR/poly(vinyl chloride) [PVC] blends were investigated by scanning electric potential microscopy (SEPM). Using the electric potential maps, it has been observed ionic specie migration from one polymer phase towards the other, during blend preparation. The migration is spontaneous because it allows the reduction of system energy thanks to the decreasing of ionion electrostatic repulsion given by ion distribution throughout the phases. The migration is directed towards the polymer that has initially the lower charge concentration and that presents the higher dielectric constant. The domains formed by the two blend component present opposite charge signals, which contribute to compatibility enhancement through electrostatic adhesion. Low-energy-loss electron spectra show differences on molecular structure of polymers that form the blends. Such differences are expressed through contrast changing in low-energyloss images (molecular maps) acquired between 20 and 90 eV. NR/P(S-BA), P(SBA)/ PVC, P(S-BA)/poly(styrene-2-hydroxyethyl metacrylate) and their respective clay nanocomposites have been analyzed by EFTEM without staining and it revealed nano-sized domains, even when chemical composition was slightly different. Clay platelet distribution within nanocomposites was revealed due to contrast canceling of polymer domains on EFTEM images.
Mestrado
Físico-Química
Mestre em Química
BRAZZO, PAOLO. "New strategies for the controlled release of vulcanization curatives in rubber blends." Doctoral thesis, Università degli Studi di Milano-Bicocca, 2018. http://hdl.handle.net/10281/199115.
Повний текст джерелаVulcanization is a process that converts rubber – natural or synthetic – into more durable objects with superior mechanical properties. Sulfur is the most used curing agent, but in the actual state-of-the-art processes new components – accelerators and activators – have been introduced to maximize the quality of the product and, meanwhile, decreasing the curing time. In tire industry is very common to work with polymer blends to achieve otherwise inaccessible properties. The main drawback is that the curatives can selectively diffuse into one phase, according to their partition coefficient. This result in a non-homogeneous vulcanization and in a gap between theoretical and real mechanical properties. Our project face this issue using a drug-delivery-inspired process. The accelerator is enclosed in a capsule made of a material that hinders its diffusion at temperature lower than the vulcanization one. We chose ethylcellulose as encapsulating material, since its softening point is compatible with the vulcanization temperatures. We used N-tert-butyl-benzothiazole-2-sulfenamide (TBBS) as accelerator. We optimized an emulsion process for the capsule production; in particular, this is a simple, easily scalable process, which can be extended to different core and encapsulating materials. However, the vulcanization test in rubber blends shows that the capsules are inefficient. In fact, there are no differences in terms of kinetics using the encapsulated accelerator or the pristine one. We recognized that the capsules are intrinsically thermally instable; in fact, the vulcanization temperatures are higher than the melting point of the accelerator, and its melting causes the capsules collapse. To overcome this problem we developed an innovative crosslinking procedure. Ethylcellulose is prefunctionalized with an epoxy; the obtained capsules are crosslinked with a thermal treatment, which complete the reaction of the epoxy with ethylcellulose. The crosslinked capsules are now thermally stable, and no collapse is observed when the temperature is increased. However, the crosslinked capsules cause a dramatic acceleration of the vulcanization kinetics in the rubber blends, even at low temperatures. We hypothesize that, due to its polarity, ethylcellulose dredges all the polar components around the capsules, saturating the surrounding region with curatives. When TBBS leaks out of the capsule, it reacts immediately. Currently, this effect is still under observation.
Cheng, Hok Yan. "Morphology and mechanical properties of polystyrene/polyethylene blends and its toughening mechanism /." View Abstract or Full-Text, 2002. http://library.ust.hk/cgi/db/thesis.pl?MECH%202002%20CHENGH.
Повний текст джерелаIncludes bibliographical references (leaves 93-100). Also available in electronic version. Access restricted to campus users.
Ahmad, Aris Bin. "A study of the partition of plasticizer and filler for highly hysteretic rubber blends." Thesis, Open University, 1990. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.238370.
Повний текст джерелаBizi, Claudia Maria Pena. "Efeito das condições de processamento e da adição de borracha trans-polioctenileno nas propriedades de blendas de borracha natural/estireno butadieno." Universidade de São Paulo, 2007. http://www.teses.usp.br/teses/disponiveis/3/3133/tde-07012008-171742/.
Повний текст джерелаPolymer blends are used in tyre industries because of their low cost and better properties. When the blend components are not miscible, chemical methods (using compatibilizing agents) or mechanical methods (increasing the mixture time of elastomers) of compatibilization are necessary to improve the compatibility of the components of the blend. In this work, Trans-Polyoctenylene Rubber (TOR) was used as a compatibilizing agent of the NR/SBR rubber blend. The Mooney viscosity, stress and elongation at break of different blends were evaluated, using a Factorial Design. The experimental results obtained showed that the Mooney viscosity is greatly affected by the addition of TOR whereas the dynamometric properties, the stress and elongation at break are more sensitive to the changes of processing time of polymers. Based on statistical results, regression equations to evaluate the properties studied as a function of TOR concentration and processing time were obtained and verified using blends which were not on the original design. The results were very satisfactory, either on the effects determination or on the regression equation determination. It was concluded that the Mooney viscosity is more sensitive to the alterations of TOR concentration than the changes in the processing time of the elastomers and the dynamometric properties are more affected by the processing time.
Wunde, Matthias [Verfasser]. "Crack propagation in rubber blends : impact of blend morphology and energy dissipation mechanisms around the crack tip / Matthias Wunde." Hannover : Gottfried Wilhelm Leibniz Universität Hannover, 2020. http://d-nb.info/1220422169/34.
Повний текст джерелаVoytyuk, Nazariy. "Recycling of Polypropylene and Polyamide Blends Using Thermomechanical Recycling." Thesis, KTH, Materialvetenskap, 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-277883.
Повний текст джерелаSyftet med avhandlingen var att återvinna en vanlig matta som innehåller polyamid-6- och polypropenpolymerer med termomekanisk återvinning och jämföra produkten med rena polymermaterial. Det återvunna materialet tillverkades med den termomekaniska processen som inkluderar malning och strängsprutning (extrudering). Filamentet analyseras med olika analystekniker inklusive FTIR, SEM, DSC och dragprovning för mekaniska egenskaper. Filamentet testas sedan med en 3D-skrivare för att se om en produkt kan tillverkas av materialet. Filamentet med återvunnen matta användes för att skapa en 3D-skriven produkt, därför verkar metoden lovande. Resultaten från analysteknikerna visade polymererna bröts ner efter flera återvinningscykler, mestadels av PA6-polymeren. De mekaniska egenskaperna med tillsats av återvunnet matta till en blandning av rena material visar liknande egenskaper jämfört med endast rena material. Sammanfattningsvis är det möjligt att 3D-skriva med återvunnet mattfilament för att skapa en 3D-skriven produkt, metoden verkar lovande.
Tahir, Muhammad. "Development of Novel Blends based on Rubber and in-situ Synthesized Polyurethane-urea." Doctoral thesis, Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2018. http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-232718.
Повний текст джерелаRomaine, Jennifer. "The synthesis, characterisation and properties of novel blends based on natural rubber latex." Thesis, Lancaster University, 1988. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.357029.
Повний текст джерелаJacob, Ricardo Francischetti. "\"Estudo das propriedades das blendas de amido termoplástico e látex natural\"." Universidade de São Paulo, 2006. http://www.teses.usp.br/teses/disponiveis/75/75131/tde-26042007-090356/.
Повний текст джерелаThe aim of the study reported here was to prepare and characterize blends of thermoplastic starch and natural rubber, based on manioc starch (tapioca), corn starch and natural rubber latex used directly as extracted from Hevea brasiliensis (Brazilian rubber tree), without prior treatment. The thermoplastic starch (TPS) matrices were prepared in a high-intensity mixer at two temperatures (120°C and 150°C), with 30% (w/w) glycerol, ethylene glycol or propylene glycol as plasticizer, and from 2.5% to 10% (w/w) natural rubber latex (NRL) was added to form the blends. The properties of the composite blends were assessed by XRD, TGA, tensile strength tests, water absorption tests and SEM. The shearing forces developed during mixing resulted in a loss of crystallinity and breakdown of the starch granule structure. The addition of NRL reduced the crystallinity index of the TPS, but did not change the type of crystal structure exhibited by this phase. The thermal stability of the TPS matrix was found to depend on the origin of the starch, the type of plasticizer, the processing temperature and the latex content. In the mechanical strength tests, the cornstarch TPS proved stronger than the manioc product, especially when plasticized with glycerol, while the mixing temperature had little influence. With the addition of NRL, no significant was observed in the mechanical properties, except for a small increase in the elongation of the material at breakpoint. As latex was added there was a linear decrease in the maximum absorption of water at equilibrium, as well as a reduction in the diffusion coefficient of water in the matrix. While the mixing process played an important part in producing an adequate blend morphology in most of the mixtures containing glycerol, the components of blends in which the TPS was plasticized with ethylene or propylene glycol were not well-dispersed. The TPS that afforded the best dispersion of latex particles was composed of cornstarch and glycerol and plasticized at 150°C. The highquality dispersion achieved was a consequence of using raw latex instead of solid rubber, since in the latex the rubber particles are coated with surface proteins and lipids that help to compatibilize the starch, a polar matrix, with the nonpolar rubber.
Adewole, Akinlabi A. "Mixing, morphological structure and properties relationship for rubber-modified polypropylene-g-polystyrene copolymer blends." Thesis, Loughborough University, 1997. https://dspace.lboro.ac.uk/2134/32028.
Повний текст джерелаBhuana, Krishna Surya. "A study of extrudate swelling and melt fracture of natural rubber blends with EPDM and SBR." Thesis, Loughborough University, 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.394889.
Повний текст джерелаLIANG, TIAN. "Structure and properties of rubbers and their blends affected by ultrasonically assisted extrusion." University of Akron / OhioLINK, 2017. http://rave.ohiolink.edu/etdc/view?acc_num=akron1502312081124254.
Повний текст джерелаTang, Kangli. "Study Of Genistein /Epoxidized Natural Rubber (ENR) Blends And Its Application For Poly (Vinyl Chloride) (PVC) Plasticization." University of Akron / OhioLINK, 2015. http://rave.ohiolink.edu/etdc/view?acc_num=akron1430243580.
Повний текст джерелаvenoor, varun. "Investigation of Poly(3-hydroxybutyrate-co-3-hydroxyvalerate)/Natural Rubber blends and Polystyrene/Polybutadiene Silica Nano-Composites." The Ohio State University, 2017. http://rave.ohiolink.edu/etdc/view?acc_num=osu1492725718211967.
Повний текст джерелаAlvares, Daniela de Assis. "Estudo da influência da morfologia sobre as propriedades elétricas da blenda de PAni com EPDM desvulcanizado por microondas, proveniente do descarte da indústria de autopeças." Universidade de São Paulo, 2008. http://www.teses.usp.br/teses/disponiveis/3/3140/tde-06112008-105348/.
Повний текст джерелаPolyaniline doped with dodecylbenzenesulfonic acid (PAni-DBSA) and ethylene-propylene-diene-monomer (EPDM) rubber devulcanizated by microwave (dEPDM) blends have been prepared by mechanical process. Flexible, free-standing and stretchable films have been obtained, which have been characterized by electrical conductivity measurements, FTIR, XRD, DSC, TGA, DMTA and SEM. Study about EPDM rubber devulcanization has been described. DSC analysis have showed different glass-transition temperatures in the blends and it has been observed that the compositions present enough compatibility to form a conductive network (PAni-DBSA) in the elastomeric matrix (dEPDM). By FTIR analysis, it has been noted that there was not modification about the spectrum of blends; therefore the interactions between the components were, basically, physics. X-ray analysis have confirmed the presence of a crystalline phase into the blends that is attributed by PAni-DBSA. TGA analysis have showed that the PAni-DBSA decreased significantly the rubber thermal stability. DMTA analysis have indicated that the system damping decreased according to the presence of PAni because of its stiffness. Finally, blends electric conductivity study has been carried out and as expected, the conductivity have increased with PAni-DBSA concentration in the blends and a low percolation threshold has been observed with the onset of conductivity occurring at lower concentrations of the conductive materials (<20%).
Pantoja, Marcos. "Compounding and Processing Approaches for the Fabrication of Shape Memory Polymers." University of Akron / OhioLINK, 2019. http://rave.ohiolink.edu/etdc/view?acc_num=akron1555666527682024.
Повний текст джерелаAhmad, Azhar. "Functionalisation of ethylene-propylene rubber with glycidyl methacrylate in the presence of comonomer and in situ compatibilisation of PET/f-EPR blends." Thesis, Aston University, 2008. http://publications.aston.ac.uk/15263/.
Повний текст джерелаTahir, Muhammad [Verfasser], Gert [Akademischer Betreuer] Heinrich, Gert [Gutachter] Heinrich, and József [Gutachter] Karger-Kocsis. "Development of Novel Blends based on Rubber and in-situ Synthesized Polyurethane-urea / Muhammad Tahir ; Gutachter: Gert Heinrich, József Karger-Kocsis ; Betreuer: Gert Heinrich." Dresden : Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2018. http://d-nb.info/1152943006/34.
Повний текст джерелаSalaeh, Subhan. "Élaboration des composites et mélanges à base de caoutchouc naturel : relations structure - propriétés." Thesis, Lyon 1, 2014. http://www.theses.fr/2014LYO10141/document.
Повний текст джерелаNatural rubber (NR) and epoxidized natural rubber (ENR) were chosen to study the composites and blends of polymers. The presence of epoxide group caused to improve the mechanical properties in terms of modulus and tensile strength. Furthermore, dielectric spectroscopy revealed that ENR showed conductivity process at low frequency and high temperature. Epoxidized natural rubber containing 50 mol% of epoxide group or ENR-50 exhibited the highest dielectric permittivity and electrical conductivity. Therefore, ENR-50 was then selected to prepare polymer composite filled with barium titanate (BT) and carbon black (CB) particles. The permittivity and conductivity of the composites increased with the volume content of the fillers. The BT/ENR-50 composites reached a high permittivity of 4 8 . 7 for addition of 50 vol% BT. Meanwhile, CB/ENR-50 composite reached percolation threshold at 6. 3 vol% of CB. The phase development and miscibility of poly(vinylidene fluoride) (PVDF)/epoxidixed natural rubber (ENR) blends were then investigated. It was also found that phase structure depended on epoxidation level and blend compositions. The blend exhibited a co-continuous phase morphology in the region of 40 to 60 wt% of ENR-50. Furthermore, the results from dynamic mechanical and dielectric analysis revealed that these blends present a partial miscibility. Finally, the composites based on binary blends of PVDF/ENR-50 containing BT were prepared. The study of the morphologies revealed that BT was dispersed in ENR-50 phase in the case of simple blend. However, the addition of BT after dynamic vulcanization induced localization of BT in PVDF phase and at interface. The highest increment of permittivity can be observed for the composite based on dynamically cured PVDF/ENR-50 (80/20) blend
ศึกษาอิทธิพลของโครงสร้างโมกุลยางธรรมชาติ (NR) และยางธรรมชาติอิพอกไซด์ (ENR) ต่อสมบัติ พบว่าการมีหมู่อิพอกไซด์อยู่ในยาง ENR ทำให้มีการปรับปรุงสมบัติเชิงกล เช่น มอดุลัสและความต้านทานต่อแรงดึง นอกจากนี้สมบัติไดอิเล็กทริกได้แสดงให้เห็นถึงการนำ ไฟฟ้าที่ความถี่ต่ำและอุณหภูมิสูง ยางที่มีหมู่อิพอกไซด์ 50 โมล% (ENR-50) มีค่าการนำไฟฟ้า และค่า permittivity สูงที่สุด ดังนั้นจึงนำยาง ENR-50 ไปใช้ในการเตรียมคอมพอสิตที่ใช้แบเรียม ไททาเนตและเขม่าดำเป็นตัวเติม ซึ่งพบว่าค่า permittivity และค่าการนำไฟฟ้าสูงขึ้นตาม ปริมาณตัวเติมที่ใส่ลงไป ที่ปริมาณ 50%โดยปริมาตรของแบเรียมไททาเนตในยางให้ค่า permittivity สูงถึง 48.7 ในขณะเดียวกันก็พบว่าการเตรียม ENR-50 คอมพอสิตที่ใช้เขม่าดำมี percolation threshold ที่ 6.3 vol% ของเขม่าดำ สำหรับการศึกษาการเปลี่ยนแปลงของสัณฐาน วิทยาและความเข้ากันได้ของพอลิเมอร์เบลนด์ระหว่างพอลิไวนิลลิดีนฟลูออไรด์ (PVDF) กับยาง ENR พบว่า สัณฐานวิทยาของพอลิเมอร์ที่เตรียมได้ขึ้นอยู่กับปริมาณหมู่อิพอกไซด์ในยาง ENR และอัตราส่วนการเบลนด์ อัตราส่วนการเบลนด์ในช่วง 40 ถึง 60% โดยน้ำหนักของยาง ENR- 50 ให้ลักษณะสัณฐานวิทยาแบบวัฏภาคร่วม (co-continuous) นอกจากนี้ผลการทดสอบจาก สมบัติพลวัตเชิงกลและสมบัติไดอิเล็กทริกแสดงให้เห็นถึงความเข้ากันได้บางส่วน (partial miscibility) ท้ายที่สุดนี้ได้เตรียมคอมพอสิตจากพอลิเมอร์เบลนด์ที่เติมแบเรียมไททาเนต สัณฐานวิทยาของคอมโพสิทที่เตรียมได้นั้น พบว่าแบเรียมไททาเนตกระจายตัวในเฟสยางเป็น หลัก อย่างไรก็ตามการเติมแบเรียมไททาเนตหลังจากการวัลคาไนซ์แบบไดนามิกส์ทำให้ แบเรียมไททาเนตกระจายตัวในเฟสพอลิไวนิลลิดีนฟลูออไรด์ (PVDF) และที่ผิวประจัญ (interface) นอกจากนี้คอมพอสิตที่เตรียมจากเทอร์โมพลาสติกวัลคาไนซ์ของ PVDF/ENR 50 ที่ อัตราส่วนการเบลนด์ที่ 80/20 ให้ค่า permittivity ที่สูง
Souza, Pricila Silva de. "Avaliação da biodegradabilidade de filmes de polihidroxibutirato com borracha natural." Universidade do Estado do Rio de Janeiro, 2014. http://www.bdtd.uerj.br/tde_busca/arquivo.php?codArquivo=9146.
Повний текст джерелаModernity requires versatile , sturdy materials , and for a long time plastic served this purpose. However , the accumulation of these materials to be discarded in the environment has become a problem Biodegradable polymers have emerged in this scenario as an alternative to avoid the accumulation of plastic waste in the environment . The polyhydroxybutyrate ( PHB ) is a class of biodegradable polymers , but it is costly and still has limited thermal properties . Natural rubber has excellent mechanical properties , aging resistance , flexibility and presents best value compared to synthetic rubbers . In this study, polymer mixtures of polyhydroxybutyrate (PHB ) and natural rubber latex in different concentrations were prepared by hot pressing . Tests of differential scanning calorimetry ( DSC ) , thermal gravimetric analysis ( TGA ) , infrared spectroscopy (FTIR ) , optical microscopy (OM ) and scanning electron microscopy (SEM ) were used to characterize and evaluate the properties of polymer blends . The PHB and blends with natural rubber were subjected to biodegradation test by simulated soil burial , according to ASTM G 160-03 , for a period ranging 2-17 weeks. At the end of each period were determined mass loss , the morphology of the specimens and the analysis of DSC , TGA and FTIR were performed . The blends showed lower thermal resistance than the PHB . In the biodegradability test , the mixtures were considered biodegradable according to ASTM G 160-03 and had reduced the percentage of crystallinity , and the content of natural rubber contributed to increase the rate of biodegradation. The SEM analysis confirmed the existence of consortia of microorganisms responsible for the biodegradation of PHB and the polymer blends
Grau, Pauline. "Étude de la structuration de mélanges d'élastomères chargés silice ; influence sur leurs propriétés dissipatives et de renfort." Thesis, Lyon 1, 2014. http://www.theses.fr/2014LYO10056/document.
Повний текст джерелаThe tradeoff in tread properties is notably controlled by the dependence in frequency of rubber dissipation: a high dissipation of energy improves wet grip at high frequencies, while it may increase rolling resistance at low frequencies. Using silica instead of carbon black has enabled an improvement of this tradeoff, but the physical mechanisms responsible of these properties are still under discussion. Besides, using polymer blends is a well-known technique to obtain materials with tailored properties, allowing for example the tuning of dissipation range and mechanical properties. These unique properties depend not only on the miscibility state of rubbers, but also on rubber phase morphology and particles distribution between phases. In this context, the issue of this work is to understand which parameters enable the modification of filler location between phases, and then to identify the impact of the various morphologies on the viscoelastic and reinforcement properties. We first study the impact of fillers on blends structuration by first varying interactions parameters between the three components (polymer A, polymer B, silica) to obtain various morphologies. It also has been shown that final blends morphologies depend also on rheological parameters. Thus the impact of process and rubber viscosities is studied, in an attempt to decorrelate the influence of rheology and interactions on blend structuration. To study reinforced rubber blends morphologies, a new microscopy technique has been developed to obtain a very clear viewing of silica in the different rubber phases. Then, the blends viscoelastic properties in the linear regime are investigated. Close to Tg, a direct relationship between filler location and dissipative and reinforcement properties is established. At higher temperatures, the filler state of dispersion appears to be a key parameter on reinforcement properties. Finally, the investigation of blends mechanical properties at larger deformations shows and impact of filler location but also filler dispersion when strong interactions are involved. Thanks to the different tools developed, we define criteria to control filler location in immiscible rubber blends, which enables a modification of their dissipative and mechanical properties
SILVA, Divânia Ferreira da. "Desenvolvimento de blendas de poliestireno/composto de resíduo de borracha da indústria calçadista." Universidade Federal de Campina Grande, 2018. http://dspace.sti.ufcg.edu.br:8080/jspui/handle/riufcg/1037.
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Capes
O objetivo deste trabalho foi desenvolver blendas de poliestireno/composto de resíduo de borracha de estireno-co-butadieno (PS/SBRr) da indústria calçadista visando tenacificar o PS e reaproveitar o SBRr. As blendas foram preparadas nas composições (70/30; 60/40 e 50/50%) em massa e com 5% do compatibilizante estireno-butadieno-estireno (SBS). A fim de se estudar o efeito da sequência de mistura, escolheu-se a composição 50/50% que apresentou o melhor resultado de resistência ao impacto. As sequências realizadas foram: PS/SBRr/SBS 47,5/47,5/5%; PS/SBRr + SBS 47,5/47,5 + 5% e PS/SBS + SBRr 47,5/5 + 47,5% em massa. As blendas foram preparadas por extrusão seguida de injeção e caracterizadas por reometria de torque, tração, impacto, flexão, temperatura de deflexão térmica (HDT), análise térmica dinâmico-mecânica (DMTA), calorimetria exploratória diferencial (DSC), microscopia eletrônica de varredura (MEV) e microscopia eletrônica de transmissão (MET). Observou-se nos resultados dos ensaios mecânicos redução no módulo de elasticidade e na resistência à tração e um aumento significativo na resistência ao impacto quando comparados ao PS para todas as composições. A HDT das misturas reduziu pouco em relação ao PS. A sequência de mistura proporcionou bons resultados das propriedades mecânicas, principalmente na composição PS/SBS + SBRr 47,5/5 + 47,5% em massa. Por MEV e MET, pôde-se observar que as blendas compatibilizadas obtiveram uma melhor distribuição das partículas de borracha com uma morfologia mais estável que as não compatibilizadas. Estes resultados foram confirmados por meio dos maiores valores de resistência ao impacto, o que indica a ação do compatibilizante melhorando a adesão entre os componentes desta blenda. Por DMTA constatou-se que estas blendas são imiscíveis. Portanto, fica evidenciada a importância da reutilização dos resíduos de borracha tanto para a tenacificação do PS como também para a redução dos problemas causados ao meio ambiente, quando estes são descartados de forma indevida.
The aim of this study was to develop blends of polystyrene/compound of rubber waste (PS/SBRr) of the shoes industry aiming to tough the PS and to reuse the SBRr. The blends were prepared in the compositions (70/30; 60/40 and 50/50 wt.%) and with 5 wt.% of styrene-butadiene-styrene compatibilizer (SBS). In order to study the effect of mixing sequence, the 50/50 wt.% composition, which presented the best result in impact strength, was selected. The sequences were PS/SBRr/SBS 47.5/47.5/5%; PS/SBRr + SBS 47.5/47.5 + 5% and PS/SBS + SBRr 47.5/5 + 47.5 wt.%. The blends were prepared by co-rotational twin screw extruder and molded by injection and characterized by torque rheometer, mechanical properties, heat deflection temperature (HDT), dynamic mechanical thermal analysis (DMTA), differential scanning calorimetry (DSC), scanning electron microscopy (SEM) and transmission electron microscopy (TEM). From the mechanical tests, a reduction in elastic modulus and tensile strength and a significant increase in impact strength were observed in relation to PS. The HDT for all blends was reduced compared to the PS. The mixing sequence showed good results in mechanical properties, especially in composition PS/SBS + SBRr 47.5/ 5 + 47.5 wt.%. By SEM and TEM it can be seen that the compatibilized blends presented a better distribution of the rubber particles with a morphology that was more stable than the one that was not compatibilized. These results were confirmed by the highest impact strength values, indicating the compatibiliz er action that improves adhesion among the components of the blend. By DMTA it was possible to state that these blends are immiscible. Hence, the importance of the reusing of rubber wastes is evidenced both for toughening of the PS and for the reduction of problems caused to the environment, when they are discharged improperly.
Merlin, Marie. "Structure et propriétés de mélanges d'élastomères chargés de noir de carbone : étude des coupages NR / SBR et BR / SBR." Phd thesis, Université Jean Monnet - Saint-Etienne, 2012. http://tel.archives-ouvertes.fr/tel-00952025.
Повний текст джерелаBarrera, Torres Giovanni [UNESP]. "Compósitos de termoplásticos com borracha natural reforçada com cinzas de bagaço de cana." Universidade Estadual Paulista (UNESP), 2017. http://hdl.handle.net/11449/151278.
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Asociación Universitaria Iberoamericana de Postgrado (AIUP)
A presente pesquisa foi projetada para promover o desenvolvimento de compósitos poliméricos a partir da mistura de polietileno de baixa densidade (PEBD) com borracha natural (BN) reforçada com a cinza, resíduo da queima do bagaço, a cinza da cana de açúcar (CBC). Uma das propostas desta pesquisa foi direcionar uma aplicação ao resíduo, que é um material abundante e descartado, gerado no processo usual das usinas. A borracha natural empregada foi obtida a partir do látex de seringueira de Hevea Brasiliensis, Clone RRIM 600 muito cultivado no Brasil. A fim de se estudar separadamente a interação entre a CBC junto a BN e os agentes de vulcanização. Foi estudada numa primeira etapa: a mistura de borracha natural com a cinza de bagaço da cana até desenvolver uma mistura chamada de master, com boas propriedades de tensão e deformação. Foram produzidos compósitos elastoméricos aplicando agente silano como sistema de acoplamento. Numa segunda etapa o master compatibilizado foi misturado ao PEBD sem o uso de agentes de vulcanização; a finalidade destes compósitos foi de estudar a interação dos constituintes visando obter um compósito com o mínimo de agentes químicos e funcional para a indústria. Numa última etapa foram desenvolvidas blendas e compósitos termoplásticos vulcanizáveis (TPV); nesta etapa foram aplicados os agentes de vulcanização empregados na primeira etapa da pesquisa. As amostras foram estudadas por meio das técnicas de análises estruturais (FT-IR); físico-mecânicas (tensão e deformação; dinâmicas e mecânicas, DMA); térmicas (DSC e TG); dureza (Shore A). Foram obtidos resultados sobressalientes em comparação com as amostras sem agentes de vulcanização nas amostras com 50 % de master e 50 % de PEBD na resposta de elongação e tensão; a dureza acima do Shore A 85 obtida, foi produto da porcentagem da fase de PEBD presente nas amostras; nas análises térmicas foi possível observar degradação acima dos 160 oC resultando uma boa característica para aplicações industriais. Com os resultados obtidos tornou-se possível direcionar tanto a CBC como os compósitos para aplicações tecnológicas a fim de serem utilizados na fabricação de cabos de ferramentas, amortecedores, produtos para o lar, entre outros.
The present research was aimed to promote the development of polymeric composites from the mixture of low density polyethylene (LDPE) with natural rubber reinforced with ash, residue of the burning of sugarcane bagasse (SCB). One of the proposals of this research was to direct an application to the residue, which is an abundant and discarded material, generated in the usual process of the plants. The natural rubber used was obtained from rubber latex clone of Hevea Brasiliensis, Clone RRIM 600 widely cultivated in Brazil. In order to study separately the interaction between SCB with NR and vulcanization agents. It was developed in the first stage: the mixing of natural rubber with the sugarcane bagasse ash to develop a mixture called master, with good tensile and deformation properties. Elastomeric composites were produced by applying silane as a coupling agent. In a second stage the compatibilized master was mixed to the LDPE without the use of vulcanization agents; the purpose of these composites was to study the interaction of the constituents in order to obtain a composite with the minimum of chemical and functional agents for the industry. In the latter stage vulcanizable thermoplastic blends and thermoplastic composites were developed; In this stage the vulcanization agents used in the first stage of the research were applied. The samples were studied using structural analysis techniques (FT-IR); Physical-mechanical (tension and deformation, dynamic and mechanical, DMA); (DSC and TG); Hardness (Shore A). Sparing results were obtained in comparison with the samples without vulcanization agents in samples with 50 % of master and 50 % of LDPE in the strain and stress response; the hardness above Shore A 85, obtained was the product of the percentage of the LDPE phase present in the samples; In the thermal analyzes it was possible to observe degradation above 160 oC resulting in a good characteristic for industrial applications. With the results obtained, it became possible to target both SCB and composites for technological applications in order to be used in the manufacture of tool cables, shock absorbers, household products, among others.
AIUP: A0 185864
Sousa, Fabiula de. "Étude des mélanges de polyéthylène renforcé avec des nanocharges et résidus de pneus régénérés par micro-ondes." Thesis, Université de Lorraine, 2016. http://www.theses.fr/2016LORR0083/document.
Повний текст джерелаThe main objective of this work was the production of dynamically revulcanized blends containing HDPE and GTR devulcanized by microwaves. It comes against a big global problem which is the waste disposal of vulcanized elastomers, especially tires, which bring with them serious environmental and public health problems, since these materials require long periods of time to degrade naturally due to their structure of cross-linkings, and the presence of stabilizers and other additives in its formulation. A way of using the GTR that has been widely studied by researchers is as polymer blends in which one of the phases is a thermoplastic polymer. In this context, the role of elastomers devulcanization is to increase the interaction between raw and recycled material, reducing the degradation of properties of the finished product with its incorporation and making it possible the increase of the recycled rubber amount in the compound recycled rubber/thermoplastic. The devulcanization transformes devulcanized elastomer into a fluid material, allowing a better control of the particle size during the mixing process of the blend by breaking processes in the application of high shear rates. In addition, by becoming a fluid material, it is possible the incorporation of a higher amount of elastomer to the thermoplastic without great damage to its processability. However, the literature does not have works in which the study of the processing parameters of dynamically revulcanized blends containing devulcanized elastomer, as well as the influence of addition of clays from different shapes (lamellar and tubular) on their final properties, especially on rheological properties, which sets out the present work. Summarizing, this work aims to propose a possible solution to the problem of solid waste disposing by producing a dynamically revulcanized blend containing HDPE and GTR devulcanized by microwaves, in addition to decrease some gaps observed currently in the literature from the obtained results
Chumeka, Wannapa. "Improvement of compatibility of poly(lactic acid) blended with natural rubber by modified natural rubber." Phd thesis, Université du Maine, 2013. http://tel.archives-ouvertes.fr/tel-01018026.
Повний текст джерелаCamargo, Felipe Filizzola. "Field and laboratory performance evaluation of a field-blended rubber asphalt." Universidade de São Paulo, 2016. http://www.teses.usp.br/teses/disponiveis/3/3138/tde-01072016-111905/.
Повний текст джерелаNo Brasil, o asfalto-borracha vem sendo utilizado desde meados de 2001. Dentre os processos de fabricação do asfalto-borracha, o mais utilizado no Brasil é o asfalto-borracha estocável ou terminal blend. Contudo, o asfalto-borracha do tipo não estocável (field blend) vem sendo bastante difundido nos Estados Unidos há décadas, principalmente no estado do Arizona. Este processo resulta em um asfalto-borracha de alta viscosidade, com alto desempenho, porém requer um equipamento de fabricação de asfalto-borracha específico, instalado no canteiro de obras, ou muito próximo à usina de asfaltos fornecedora da obra. Tendo em vista as possíveis vantagens tecnológicas do asfalto-borracha field blend e o conhecimento ainda pequeno sobre esta técnica no Brasil, há a necessidade de desenvolver estudos para a avaliação deste tipo de material frente às condições climáticas e de solicitação pelas cargas viárias em nosso país. Para tanto, foi realizado um estudo em laboratório para verificar as propriedades reológicas de um asfalto-borracha field blend e compará-las com as características de ligantes típicos empregados no Brasil (um CAP 30-45 e um ligante modificado por polímero elastomérico do tipo SBS). Elegeu-se o Multiple Stress Creep and Recovery (MSCR) para verificar a deformação permanente e o Time Sweep e Linear Amplitude Sweep (LAS) para verificar o comportamento na fadiga dos ligantes. Na sequência, determinou-se a deformação permanente e o comportamento à fadiga de uma mistura asfáltica descontínua (gap-graded) empregando o asfalto-borracha field blend em laboratório e no campo. A deformação permanente da mistura foi verificada por meio do simulador de tráfego LCPC, enquanto a vida de fadiga foi determinada utilizando o ensaio de flexão em viga (4 pontos). Por fim, foi construída uma seção teste após a conclusão da obra de restauração dos pavimentos da rodovia RJ-122, local onde se elegeu a utilização desta tecnologia pela primeira vez no país. O desempenho da mistura foi estudado in loco com o emprego de ensaios acelerados do pavimento utilizando-se o simulador de tráfego linear móvel em tamanho real. Os resultados obtidos foram utilizados para modelar o desempenho da estrutura com o revestimento asfáltico constituído pela mistura com o asfalto-borracha por meio dos modelos de trincamento e de deformação permanente do Highway Development and Management Model (HDM-4), podendo-se verificar o desempenho desta mistura calibrado para as condições locais. Os ensaios acelerados foram validados em campo por meio de campanhas de monitoramento periódicas realizadas ao longo de quatro anos na rodovia RJ-122. Pelos ensaios de laboratório no ligante e na mistura foi possível concluir que o asfalto-borracha field blend apresenta um bom desempenho quanto à deformação permanente e à fadiga, corroborando o que foi verificado no campo.
Iqbal, Md Tanvir. "Evaluation of Asphalt Mixtures Incorporating Terminal Blend GTR (Ground Tire Rubber) Binders." Ohio University / OhioLINK, 2016. http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1462970773.
Повний текст джерелаTeruya, Marcia Yumi. "Blendas condutoras elétricas obtidas a partir do látex de seringueira Hevea Brasiliensis com polianilina." Universidade de São Paulo, 2003. http://www.teses.usp.br/teses/disponiveis/88/88131/tde-01122014-113352/.
Повний текст джерелаThe combination of properties of different polymeric materials in one sample is of great interest. In this work natural rubber films covered with a layer of conductive polyaniline (PANI) were prepared and studied by means of several experimental techniques. The doped PANI layer was deposited onto both rubber films surfaces by the \"in situ\" polymerization technique. The polymerization of PANI was performed at room temperature and the deposition process was optimized in order to obtain a PANI layer with an adequate thickness, good adhesion to the rubber and to promote the increase of its surface electric conductivity. Samples were characterized employing the scanning electron microscopy, optical microscopy, X-ray diffractometry, differential scanning calorimetry, thermo gravimetric analysis, dynamic mechanical thermal analysis, mechanical analysis and surface/volume electric conductivity. Results showed that the formed films consisted of a PANI layer that did not penetrated in the rubber. The better uniformity of deposition and maximum electric conductivity of the order of 10-7 S/cm was obtained on films that were prepared by deposition of three PANl layers
Sritragool, Kunlapaporn. "Modification of Rubber Particle filled Thermoplastic with High Energy Electrons." Doctoral thesis, Universitätsbibliothek Chemnitz, 2010. http://nbn-resolving.de/urn:nbn:de:bsz:ch1-201000954.
Повний текст джерелаMaier, Thomas Robert. "The effects of polymer microstructure and macrostructure on SBR/polybutadiene blend miscibility, phase morphology, and cured rubber properties." Case Western Reserve University School of Graduate Studies / OhioLINK, 1995. http://rave.ohiolink.edu/etdc/view?acc_num=case1061908392.
Повний текст джерелаSimões, Rebeca Delatore [UNESP]. "Estudo das propriedades físicas de blendas de PVDF/Látex visando aplicação como biomaterial." Universidade Estadual Paulista (UNESP), 2005. http://hdl.handle.net/11449/88469.
Повний текст джерелаCoordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)
Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)
O principal objetivo deste trabalho de mestrado foi a obtenção e caracterização estrutural de um material com propriedades físico-químicas compatíveis com aquelas requeridas por um biomaterial. Filmes contendo diferentes volumes de látex de borracha natural em uma massa fixa de poli(fluoreto de vinilideno) (PVDF), na forma de pó foram fabricados por compressão/aquecimento de uma mistura de ambos os materiais sem o uso de qualquer solvente. Este é um fator importante considerando o uso destes filmes no futuro próximo como biomateriais em diferentes aplicações (indução do crescimento do tecido ósseo, por exemplo), uma vez que os solventes convencionais usados para dissolver o PVDF têm se mostrado tóxicos ao organismo humano. Os filmes foram submetidos a um tratamento via descarga corona de forma que amostras com e sem tal tratamento foram caracterizadas através das técnicas de espectroscopia vibracional via espalhamento Raman e absorção no infravermelho (FTIR), análise térmica via termogravimetria (TG), calorimetria exploratória diferencial (DSC) e análise dinâmico-mecânica (DMA) e microscopias ótica e eletrônica (MEV). As medidas termomecânicas mostraram que os filmes obtidos possuem características mecânicas similares àquelas encontradas no osso humano e boa estabilidade térmica considerando-se a aplicação desejada. As medidas via espectroscopia vibracional indicaram que o PVDF e o látex não interagem quimicamente, compondo uma blenda polimérica. Além disto, os resultados obtidos via micro-Raman mostraram que o aumento da quantidade de látex na blenda permite uma melhor dispersão deste látex na matriz de PVDF quando da produção dos filmes...
The main goal of this work was to obtain and characterize structurally a material with physical-chemical properties compatible with those required for a biomaterial. Films containing different volumes of latex of natural rubber in a fixed mass of poly (vinylidene fluoride) (PVDF) powder were fabricated by compressing/annealing a mixture of both materials without using any solvent. This is an important issue having in mind to use these films in the future as biomaterials in different applications (growing of the bone tissue, for instance) once the solvents used to dissolve the PVDF are toxic to human being. The films were submitted to a corona discharge treatment in a way that samples with and without such treatment were characterized using micro-Raman scattering and Fourier transform infrared absorption (FTIR) spectroscopies, thermo-mechanical techniques using thermogravimetry (TG), differential scanning calorimetry (DSC) and dynamical-mechanical analysis (DMA) and optical and scanning electron microscopies (SEM). The thermo-mechanical measurements revealed that the films present mechanical properties close to that found for the human bone and high thermal stability considering the desired applications. The vibrational spectroscopies showed that the latex and PVDF do not interact chemically leading to the formation of a polymeric blend. Besides, the results recorded using the micro-Raman technique revealed that the higher the amount of latex in the blend, the better the miscibility between both materials. In terms of morphology, the blend surface is formed by two domains: one is rougher and contains the latex well dispersed into the PVDF matrix while the other is smoother and contains both materials as well but in a less homogeneous dispersion. However, as the volume of latex is increased from 0.3 to 1.0 mL, the smoother domains become rarer to be found... (Complete abstract, click electronic address below)
Simões, Rebeca Delatore. "Estudo das propriedades físicas de blendas de PVDF/Látex visando aplicação como biomaterial /." Presidente Prudente, 2005. http://hdl.handle.net/11449/88469.
Повний текст джерелаBanca: Neri Alves
Banca: Osvaldo Novais de Oliveira Júnior
O Programa de Pós-Graduação em Ciência e Tecnologia de Materiais, PosMat, tem caráter institucional e integra as atividades de pesquisa em materiais de diversos campi da Unesp
Resumo: O principal objetivo deste trabalho de mestrado foi a obtenção e caracterização estrutural de um material com propriedades físico-químicas compatíveis com aquelas requeridas por um biomaterial. Filmes contendo diferentes volumes de látex de borracha natural em uma massa fixa de poli(fluoreto de vinilideno) (PVDF), na forma de pó foram fabricados por compressão/aquecimento de uma mistura de ambos os materiais sem o uso de qualquer solvente. Este é um fator importante considerando o uso destes filmes no futuro próximo como biomateriais em diferentes aplicações (indução do crescimento do tecido ósseo, por exemplo), uma vez que os solventes convencionais usados para dissolver o PVDF têm se mostrado tóxicos ao organismo humano. Os filmes foram submetidos a um tratamento via descarga corona de forma que amostras com e sem tal tratamento foram caracterizadas através das técnicas de espectroscopia vibracional via espalhamento Raman e absorção no infravermelho (FTIR), análise térmica via termogravimetria (TG), calorimetria exploratória diferencial (DSC) e análise dinâmico-mecânica (DMA) e microscopias ótica e eletrônica (MEV). As medidas termomecânicas mostraram que os filmes obtidos possuem características mecânicas similares àquelas encontradas no osso humano e boa estabilidade térmica considerando-se a aplicação desejada. As medidas via espectroscopia vibracional indicaram que o PVDF e o látex não interagem quimicamente, compondo uma blenda polimérica. Além disto, os resultados obtidos via micro-Raman mostraram que o aumento da quantidade de látex na blenda permite uma melhor dispersão deste látex na matriz de PVDF quando da produção dos filmes... (Resumo completo, clicar acesso eletrônico abaixo)
Abstract: The main goal of this work was to obtain and characterize structurally a material with physical-chemical properties compatible with those required for a biomaterial. Films containing different volumes of latex of natural rubber in a fixed mass of poly (vinylidene fluoride) (PVDF) powder were fabricated by compressing/annealing a mixture of both materials without using any solvent. This is an important issue having in mind to use these films in the future as biomaterials in different applications (growing of the bone tissue, for instance) once the solvents used to dissolve the PVDF are toxic to human being. The films were submitted to a corona discharge treatment in a way that samples with and without such treatment were characterized using micro-Raman scattering and Fourier transform infrared absorption (FTIR) spectroscopies, thermo-mechanical techniques using thermogravimetry (TG), differential scanning calorimetry (DSC) and dynamical-mechanical analysis (DMA) and optical and scanning electron microscopies (SEM). The thermo-mechanical measurements revealed that the films present mechanical properties close to that found for the human bone and high thermal stability considering the desired applications. The vibrational spectroscopies showed that the latex and PVDF do not interact chemically leading to the formation of a polymeric blend. Besides, the results recorded using the micro-Raman technique revealed that the higher the amount of latex in the blend, the better the miscibility between both materials. In terms of morphology, the blend surface is formed by two domains: one is rougher and contains the latex well dispersed into the PVDF matrix while the other is smoother and contains both materials as well but in a less homogeneous dispersion. However, as the volume of latex is increased from 0.3 to 1.0 mL, the smoother domains become rarer to be found... (Complete abstract, click electronic address below)
Mestre
Chen, Xiaocheng. "Synthesis of 10-Carboxy-N-Decyol-N, N’- Dimethyldecyl-1-Ammonium Bromide as Organogelator & Room temperature Shape Memory Programming of Stearic Acid/ Natural Rubber Bilayer Blend." University of Akron / OhioLINK, 2017. http://rave.ohiolink.edu/etdc/view?acc_num=akron1500563824207268.
Повний текст джерелаChang, Min-Yu, and 張銘宇. "Shape Memory Natural Rubber and Polycaprolactone Eco-blends." Thesis, 2011. http://ndltd.ncl.edu.tw/handle/89291325746360290723.
Повний текст джерела中國文化大學
材料科學與奈米科技研究所
99
Green thermoplastic elastomer based on polycaprolactone and epoxidized natural rubber blend was prepared by melt mixing process. Peroxide cured NR (Natural rubber, SVR-3L) and PCL (Polycaprolactone, Tone-787) has been prepared to form Eco-blends. NR and PCL were crosslinked with DCP (dicumyl peroxide) to form NR/PCL/DCP blends was premixed using an internal mixer. The results from SEM (scanning electron microscope) experiments revealed that NR/PCL blend were crosslinked with DCP. The results from DSC (Differential scanning calorimetry) experiments revealed that the Tm (Melting temperature) was reduced with increasing the DCP concentration. Tensile strength increasing with decreased the content of PCL and increasing the DCP. The important quantities to be determined for describing shape memory properties of a material are the strain recovery rate (Rr) and strain fixity rate (Rf). A description of a thermomechanical test with loading at 60 oC. Such NR/PCL/DCP blend networks possessing crystalline domains together with appreciable degree of crosslinking showed good shape retention and shape recovery, and the recovery temperatures were well matched with the crystalline melting temperature of each sample. The shape recovery ratio of the thermoplastic polyurethane SMP is usually in the range of 90–95 % within 20 shape recovery cycles. In this study, the shape recovery ratio of the NR-PCL blend SMP is 99 % within 30 shape recovery cycles.
Chuang, Chih-Kuang, and 莊志光. "Low density polyethylene/ethylene-propylene rubber blends foam crosslinked by electron beam." Thesis, 2006. http://ndltd.ncl.edu.tw/handle/90188846277831469903.
Повний текст джерела元智大學
化學工程與材料科學學系
94
LDPE (Low density polyethylene) has a simple chemical structure. It could be recycled and regenerated easily, most of its combustion products are carbon dioxide and water. This study, LDPE was blended with EPR (ethylene-propylene rubber) and irradiated by electron beam under heat to make foam materials. The mixing of amorphous rubber into LDPE resulted LDPE, a semi-crystal material, to have better resiliency. Seven LDPE/EPR blends with different EPR contents ranging from 0 to 100 weight percent were foamed. The microcellular morphology of the foam was investigated using a scanning electron microscope. The effects of decomposition promoter on chemical blowing agent were measured via thermo-gravimetric analysis. The density, tensile strength, elongation at break, compressive strength and compression set of foam were according to the ASTM D-3575 procedures. The LDPE/EPR blend with a weight ratio of 70/30 and a gel fraction ranging from 30% to 50% was found to be an optimum condition for making foam materials.
Hsiao, Chen-Kuang, and 蕭晨光. "Characteristics of Polyviny acetate/Recycle-Rubber blends with Non-halogen Fire-retardant." Thesis, 2011. http://ndltd.ncl.edu.tw/handle/79765916137323676860.
Повний текст джерела萬能科技大學
材料科技研究所
99
This study was prepared for the polyethylene vinyl acetate/recycled rubber (EVA/R) blend, which has the mixing percentage from 5 to 30wt%; moreover, the EVA/R blends were mixing the effectively halogen flame retardants of 25phr for prepared the flame-retardant properties of EVA/R blends. The EVA/R blends and flame retardant- containing EVA/R blends on the flow property, phase transfer regions, tensile strength and degradation property were determine in here. The melt index (MI) is reduced as the recycling rubber was mixed in EVA, however, and the flame retardant was added in the EVA/R resulted in a reducing of MI value. The EVA/R and flame retardant containing-EVA/R blends were the two-phase structure including the non-crystalline and crystalline phases which were dispersed by recycling rubber particles and flame retardants. Because of these recycling rubber particles and flame retardants dispersed in the EVA matrix, the flame retardant and recycled rubber and is incompatible, EVA/R and flame retardant containing-EVA/R blends on the tensile strength deceased with the increase recycled rubber and flame retardant due to the rubber particles together and the flame retardant resulted in the interface defect in the EVA matrix. Moreover, the anti-friction property is increase for the EVA/R has 5~10wt% of recycled rubber content. The EVA/R blends have at least two steps of degradation, and the thermal stability of blends can be improved by the recycled rubber; however, flame retardant which added into the EVA R blends resulted in a low stability of degradation.