Dissertations / Theses on the topic 'Bland- Nanocomposites'
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Zhang, Wei. "Controllable growth of porous structures from co-continuous polymer blend." Diss., Georgia Institute of Technology, 2011. http://hdl.handle.net/1853/39608.
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Due to their large internal surface area, microporous materials have been widely used in applications where high surface activity is desired. Example applications are extracellular scaffolds for tissue engineering, porous substrates for catalytic reaction, and permeable media for membrane filtration, etc. To realize these potential applications, various techniques such as TIPS (thermal induced phase separation), particle leaching, and SFF (solid freeform fabrication) were proposed and investigated. Despite of being able to generate microporous for specific applications, these available fabrication techniques have limitations on controlling the inner porous structure and the outer geometry in a cost-effective manner. To address these technical challenges, a systematic study focusing on the generation of microporous structures using co-continuous polymer blend was conducted. Under this topic, five subtopics were explored: 1) generation of gradient porous structures; 2) geometrical confining effect in compression molding of co-continuous polymer blend; 3) microporous composite with high nanoparticle loading; 4) micropatterning of porous structure; 5) simulation strategy for kinetics of co-continuous polymer blend phase coarsening process.
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WEGRZYN, MARCIN. "Nanocomposites of Multiphase Polymer Blend Reinforced with Carbon Nanotubes: Processing and Characterization." Doctoral thesis, Universitat Politècnica de València, 2014. http://hdl.handle.net/10251/36869.
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This thesis presents the study of nanocomposites based on immiscible
polymer blend of polycarbonate and acrylonitrile-butadiene-styrene
(PC/ABS) filled with multi-walled carbon nanotubes (MWCNT). The aim is to
achieve an improvement of mechanical properties and electrical conductivity
of the nanocomposites.
In an initial stage, a twin-screw extruder was used to obtain nanocomposites
by melt compounding. Three methods of carbon nanotubes addition were
studied: direct addition, dilution from a masterbatch and feeding of MWCNT
suspension in ethanol. For each method, the influence of nanofiller content
and processing parameters on morphology and final properties of the
nanocomposite was analyzed. Furthermore, the influence of two types of
carbon nanotubes modifications was studied: covalent modification by
surface-oxidation (MWCNT-COOH) and non-covalent modification by an
addition of surfactant promoting the nanofiller-matrix interactions.
A good dispersion of the MWCNT was obtained for masterbatch dilution and
suspension feeding. Both methods showed preferential localization of
carbon nanotubes in polycarbonate phase (PC).
Samples processed by masterbatch dilution showed the 30 % increase of
rigidity and a decrease of ductility of PC/ABS for 0.5 wt. % MWCNT.
Electrical conductivity was influenced by processing temperature and carbon
nanotubes type. The percolation threshold value was 2.0 wt. % for pristine
MWCNT and 1.5 wt. % for modified MWCNT-COOH.
Better balance of mechanical properties and electrical conductivity was
achieved in the samples obtained by the masterbatch route. These
properties were studied in a subsequent phase, when the extruded
nanocomposite was injection molded in order to obtain a defined geometry.Wegrzyn, M. (2014). Nanocomposites of Multiphase Polymer Blend Reinforced with Carbon Nanotubes: Processing and Characterization [Tesis doctoral no publicada]. Universitat Politècnica de València. https://doi.org/10.4995/Thesis/10251/36869
TESIS
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Bock, Thorsten R. "Catalytic phosphonation of high performance polymers and POSS novel components for polymer blend and nanocomposite fuel cell membranes /." [S.l.] : [s.n.], 2007. http://www.freidok.uni-freiburg.de/volltexte/2881.
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Wang, Sheng. "Phosphorus-Containing Polymers, Their Blends, and Hybrid Nanocomposites with Poly(Hydroxy Ether), Metal Chlorides, and Silica Colloids." Diss., Virginia Tech, 2000. http://hdl.handle.net/10919/26789.
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Phosphorus-containing high performance polymers have been extensively studied during the last 10 years. These materials are of interest for a variety of optical and fire resistant properties, as well as for their ability to complex with the inorganic salts. This dissertation has focused on the nature of the phosphonyl group interactions with hydroxyl containing polymers, such as the poly(hydroxy ether)s. These may be considered linear models of epoxy resins and are also closely related to dimethacrylate (vinyl ester) matrix resins that are important for composite systems. It has been shown that bisphenol A poly(arylene ether phosphine oxide/sulfone) homo- or statistical copolymers are miscible with a bisphenol A-epichlorohydrin based poly(hydroxy ethers) (PHE), as shown by dynamic mechanical analysis (DMA) and differential scanning calorimetry (DSC), infrared spectroscopy and , solid state cross polarization-magic angle spinning nuclear magnetic resonance (CP-MAS). These measurements illustrate the strong hydrogen bonding between the phosphonyl groups of the copolymers and the pendent hydroxyl groups of the PHE as the miscibility inducing mechanism. Complete miscibility at all blend compositions was achieved with as little as 20 mole% of phosphine oxide units in the poly(arylene ether) copolymer. Replacement of the bisphenol A moiety by other diphenols, such as hydroquinone, hexafluorobisphenol A and biphenol did not significantly affect blend miscibilities. Miscible polymer blends with PHE were also made by blending poly(arylene thioether phosphine oxide), and fully cyclized phosphine oxide containing polyimides based on (prepared from 2,2'-bis[4-(3,4-dicarboxyphenoxy)phenyl]propane dianhydride (BPADA) and bis(m-aminophenyl) methyl phosphine oxide (DAMPO)) or bis(m-aminophenyl) phenyl phosphine oxide).
Additional research has focused on the influence of these materials on the property characteristics of vinyl ester matrix resins and has shown that the concentration of phosphonyl groups controls the homogeneity of both oligomers and the resulting networks. Scanning electron microscopy (SEM), transmission electron microscopy (TEM), and fracture toughness measurements further confirmed the qualitative observations.
Metal salts, such as CoCl2 and CuCl2 had earlier been demonstrated to form complexes/nanocomposites with phosphorus-containing poly(arylene ethers). It has been possible to prepare transparent films with 100 mol% of metal chlorides, based upon the phosphonyl groups. The films are transparent, unlike the opaque polysulfone control systems. FTIR results suggested the formation of inorganic salt and polymer complexes at low concentrations. TEM showed homogeneous morphology at low concentrations and excellent dispersion even at high mole % of salts. Cobalt materials reinforce the basic poly(arylene ether)s to provide higher modulus values and influence positively the char yield generated after TGA experiments in air. The cobalt salt/BPADA-DAMPO polyimide composites also yield transparent films, implying very small dimensions.
Silica-polymer nanocomposites were also produced by mixing commercial silica colloid/N,N-dimethylacetamide (DMAc) fine dispersions (~ 12 nm) with bisphenol A poly(arylene ether phenyl phosphine oxide). The dry films produced by solution casting are transparent and silica colloids are evenly dispersed (~ 12 nm) into the polymer matrix as shown by TEM. These nanocomposites increased char yield compared with the polymer control, suggesting their fire retardant character. In comparison, the silica/polysulfone hybrid films prepared by the same methods were opaque and the char yield was not improved. This different phase behavior has been explained to be due to the hydrogen bonding between phosphonyl groups and silanol hydroxyl groups on the surface of the nanosilica.Ph. D.
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Holliday, Nathan. "Processing and Properties of SBR-PU Bilayer and Blend Composite Films Reinforced with Multilayered Nano-Graphene Sheets." University of Cincinnati / OhioLINK, 2016. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1458300045.
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Blanchard, Anthony. "Amélioration des propriétés barrière d'un copolymère EVOH par les approches nanocomposites et mélanges de polymères : relations structure-morphologie-propriétés." Thesis, Lyon, 2018. http://www.theses.fr/2018LYSE1349.
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L’EVOH est un copolymère thermoplastique semi-cristallin composé de segments de polyéthylène et d’alcool polyvinylique de proportion variable. Grâce notamment à une importante densité d’énergie cohésive lui conférant d’excellentes propriétés barrière à l’oxygène et aux arômes en condition anhydre, ce matériau est aujourd’hui largement utilisé dans l’élaboration d’emballages alimentaires multicouches. Sa grande sensibilité à l’eau, provoquant une détérioration importante des propriétés du matériau en conditions hydratées, reste cependant la principale problématique liée à son utilisation actuelle. Dans ce contexte, les travaux ont dans un premier temps porté sur la compréhension approfondie du comportement d’hydratation de l’EVOH afin de mettre en évidence des relations propriétés-structure, ce qui n’avait pas été réalisé jusqu’à présent. Deux axes de recherches ont ensuite été développés dans le but d’améliorer les propriétés barrière du matériau aussi bien à l’état anhydre qu’à l’état hydraté, tout en conservant une bonne transparence et une tenue mécanique correcte: le mélange de polymère d’une part, et l’approche nanocomposite d’autre part. Le choix de la voie fondu, procédé de mise en œuvre peu décrit dans la littérature pour ces systèmes, et celui des charges ont été guidés par la possibilité de transposer facilement les études à l’échelle industrielleEVOH is a semi-crystalline thermoplastic copolymer composed of polyethylene and polyvinyl alcohol segments in various contents. Thanks to an important cohesive energy density leading to excellent oxygen and food aromas barrier properties in anhydrous state, this material is currently widely used in the elaboration of multilayer food packaging. Its high moisture sensitivity, causing an important deterioration of the properties of the material in hydrated conditions, still constitutes the main inconvenient for its current use. In this context, the studies were firstly focused on the detailed comprehension of the hydration behavior of EVOH in order to underline properties-structure relations, which was still unrealized. Two research axes were then developed in order to improve the barrier properties of the material in both dry and hydrated states, while remaining mechanical behavior and transparency stable: the polymers blend, on the one hand, and the nanocomposite approach on the other hand. The choice of the melting way, rarely described in the literature for these systems, and the one of the fillers nature were dictated by the possibility to easily transpose the experiments to an industrial scale
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Levchenko, Volodymyr. "Morphologie et propriétés électrophysiques de nanocomposites à base de polymères thermoplastiques et de nanotubes de carbone." Phd thesis, Université Claude Bernard - Lyon I, 2011. http://tel.archives-ouvertes.fr/tel-00862137.
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La thèse détermine les principaux paramètres de la formation des structures de la phase conductrice de nanocomposites polymères chargés avec des nanotubes de carbone (NTC) ou des nanocharges combinées, pour étudier l'influence de la morphologie de la structure hétérogène du composite et l'interaction des nanocharges sur les propriétés électriques, thermophysiques et mécaniques des composites. Les trois types de systèmes polymères ont été étudiés, à savoir: 1) les systèmes ségrégés avec distribution ordonnée de nanocharges, 2) les mélanges polymère conducteur; 3) les composites avec des charges binaires où les nanotubes de carbone ont été combinés avec des composés organo-argileux modifiés (MOC) dans un cas et des nanoparticules métalliques d'autre part. Les résultats sur les composites polymères ségrégés chargés avec des NTC ont montré que dans de tels systèmes, la charge conductrice crée un réseau continu conducteur au sein de la matrice polymère. Cela conduit à un seuil de percolation ultra faible avec la valeur de φc~0,045vol.%. Il a été démontré que les systèmes conducteurs à base de mélanges de polymères ont un seuil de percolation inférieur en raison d'effet de double percolation. Il a été constaté que l'introduction simultanée de composés MOC et de NTC dans la matrice thermoplastique permet une meilleure répartition des nanotubes de carbone, ce qui empêche leur agrégation. Il en résulte une diminution du seuil de percolation des composites. Il a été démontré que la formation de la phase conductrice est plus efficace avec des charges mixtes CNT/nanométal en comparaison avec les charges individuelles
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紘宜, 松本, and Koki Matsumoto. "二軸押出機を用いたナノコンポジットの分散混合に関する研究." Thesis, https://doors.doshisha.ac.jp/opac/opac_link/bibid/BB13071692/?lang=0, 2018. https://doors.doshisha.ac.jp/opac/opac_link/bibid/BB13071692/?lang=0.
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Banerjee, Ritima. "Studies on the foaming behaviour of sebs based blends and nanocomposites." Thesis, 2018. http://localhost:8080/xmlui/handle/12345678/7681.
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(8676840), Sung Ho Yook. "Anisotropic Polymer Blend and Gel Nanocomposites Using External Electric or Magnetic Fields." Thesis, 2020.
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In this dissertation, new ways for controlling the internal structures of a system of polymer composites, polymer blends, and hydrogel composites by means of external electric or magnetic fields are presented. The first part of this study addresses the development of an anisotropic phase-separated morphology in polymer blends by using electrically pre-oriented clay particles. It was observed that electrically pre-oriented montmorillonite clay particles in a homogenous single-phase blend lead to anisotropic phase-separated morphology of the blends, undergoing demixing upon temperature shift to a two-phase regime. The initial co-continuous microstructure developed into a coarsened and directionally organized phase-separated morphology parallel to the direction of oriented clay particles (applied AC electric field direction) over the annealing time. It was also found that the degree of clay orientation under AC electric field was linearly proportional to the degree of polymer-phase orientation. The temporal morphological evolution was thoroughly analyzed by electron microscopy and X-ray diffraction studies. The second part of the study covers anisotropic hydrogel nanocomposites developed by orienting magnetically sensitive nontronite clay minerals under the strong magnetic fields. Anisotropic hydrogel nanocomposites were formed by magnetic-field assisted orientation of nontronite clays suspended in a hydrogel precursor solution followed by a gelation process. The degree of orientation of nontronite minerals was quantitively characterized by birefringence and small-angle X-ray scattering. The resultant hydrogels exhibited anisotropic optical, mechanical, and swelling properties along the direction of oriented clay minerals. Anisotropic water swelling behaviors can be particularly applied in medical dressing materials, where vertical wicking of fluid into the wound dressing is sought after for minimizing periwound maceration damage.
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Yu-JuiKao and 高育瑞. "Flexible ZnO-SiO2 nanocomposites solar-blind photodetector." Thesis, 2012. http://ndltd.ncl.edu.tw/handle/43452289048917371268.
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碩士國立成功大學
光電科學與工程學系
100
In this research, we deposited ZnO-SiO2 nanocomposite by magnetron sputter at room temperature and used it as the absorption layer on the flexible polyethersulfone (PES) substrate to fabricate a high detectivity and low noise flexible solar-blind photodetector. At a 10 V reverse bias, the maximum responsivity value and quantum efficiency of the device were 0.75 A/W and 482% at 240 nm respectively, and it showed a high UV-to-visible rejection ratio up to ~105. We used silicon-based organic thin film (SiOx(CH3)) as the buffer layer between ZnO-SiO2 nanocomposite and substrate. The buffer layer enhanced the characteristics of photodetectors because it suppressed the stress of ZnO-SiO2 nanocomposite effectively. It also reduced the characteristic difference between nanocomposites deposited on polyethersulfone (PES) and sapphire. By bending measurement, the responsivity and UV-to-visible rejection ratio of flexible photodetectors slightly decayed when the radius of curvature decreased. However, all devices still remain favorable photoelectric properties, especially the flexible photodetector with silicon-based organic thin film (SiOx(CH3)). The SiOx(CH3) layer released stress on the nanocomposite during bending measurement; therefore, the reduction of photoelectric properties was suppressed.
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Wang, Ching-Ho, and 王清禾. "Preparation of Polyaniline based Nanocomposites and Polymer Blend." Thesis, 2006. http://ndltd.ncl.edu.tw/handle/78100487901128387438.
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碩士國立高雄應用科技大學
化學工程系碩士班
94
The experiments of this study were divided into three parts : the first was to prepare the Zinc dodecyl benzenesulfonate( Zn(DBS)2 ).This composites prepared from Zn(DBS)2 and polyaniline will create a comb-shaped structure and properties of the complex composite was investigated by WXRD, POM, TGA, to analyze the layer structure, crystal structure, and thermal properties. The second was to prepare the conducting nanocomposites of polyanilne and clay at master batch. We analyzed the conducting master batch with WXRD, UV-vis, TGA, ESCA, to characterize the intercalation, conjugated structure of polyaniline , thermal properties, and the binding energy changes. Finally, it was to prepare the conducting polyblends prepared from master batch and regular organic polymers with WXRD, TGA, SEM, Miliohm meter were used to analyze the compatibility, thermal properties, morphology, electrical conductivity of the polyblends. Keywords : Polyaniline 、 nanocomposites 、 Conducting polyblends
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Lee, Cheng En, and 李承恩. "Development and Characterization of Polyolefin Blend-based Nanocomposites." Thesis, 2010. http://ndltd.ncl.edu.tw/handle/76661288825414442125.
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碩士長庚大學
化工與材料工程學系
98
In this study, PP/LDPE blend-based nanocomposites were prepared through a twin-screw extruder. An Organoclay (15A) and an EPDM-MA copolymer served as the nano-filler and compatibilizer, respectively. Two grades of PP with different viscosities were selected to be the composites’ main matrix. The influence of PP viscosity on the preparation and properties of the composites was investigated. XRD and TEM results confirm that EPDM-MA facilitated the dispersibility of 15A in the polymer matrix. SEM results show that adding EPDM-MA reduced the domain size of dispersed LDPE phase. DSC and PLM results indicate that 15A retarded the crystallizability of PP, whereas 15A affected hardly the crystallization of LDPE. TGA results show that the thermal stability of PP/PE blends was enhanced after adding 15A and/or EPDM-MA. Rheological properties investigation reveals that the influence of PP viscosity on the measured properties was negligible due to the synergistic effect from inclusions of 15A and EPDM-MA in the composites.
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Liu, Tien Sheng, and 劉天聲. "Characterization of PBAT/PEgMA Blends and Blend-based Nanocomposites." Thesis, 2015. http://ndltd.ncl.edu.tw/handle/88937833257857119515.
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Chuang, Yi Chang, and 莊逸彰. "Preparation and Characterization of PVDF/PVAc Blend-based Nanocomposites." Thesis, 2015. http://ndltd.ncl.edu.tw/handle/29192839475514737989.
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Cai, He Jie, and 蔡賀傑. "Preparation and Characterization of PC/PVDF Blend-based Nanocomposites." Thesis, 2015. http://ndltd.ncl.edu.tw/handle/56442196883092822990.
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Lin, Yi Wen, and 林奕妏. "Preparation and Characterization of PVDF/PBAT Blend-based Nanocomposites." Thesis, 2016. http://ndltd.ncl.edu.tw/handle/wyvf98.
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碩士長庚大學
化工與材料工程學系
104
In this study, poly(vinylidene fluoride) (PVDF)/ poly(butylene adipate-co-terephthalate) blend-based nanocomposites were prepared via a melt mixing process. PVDF/PBAT/CNTs, PVDF/PBAT/15A, PVDF/PBAT/PBS, and PVDF/PBAT/PBSA composites systems were prepared for the purpose of enhancing the composites’ properties. PBAT is a biodegradable polymer with high ultimate elongation, provided with antibacterial and anti-oxidative effects. However, the poor thermal property and low modulus of PBAT needed to be improved. Therefore, we seek to reinforce the PBAT’s thermal properties and mechanical properties through adding PVDF. Furthermore, the addition of nanoscale materials to PVDF/PBAT blends may enhance their desired properties and increase the compatibility of PVDF/PBAT blends. SEM and TEM images showed that both CNTs and 15A were selectively located in PBAT phase. TGA data showed enhanced thermal stability for the nanocomposites and eliminate the two-phase degradation. DSC data indicated that both CNTs and 15A increased the crystallization temperature of PBAT and exhibited a heterogeneous nucleation effect. Furthermore, XRD results confirmed that the formation of β-form PVDF crystals with the addition of 15A. Young’s modulus of the composites with CNTs showed an improvement as compared to PVDF/PBAT blends. Rheological properties analysis indicated that the incorporation of CNTs increased the complex viscosity, storage modulus, and loss modulus. 15A also increased rheological properties of larger proportions of PVDF sample. The electrical property didn’t change significantly after adding CNTs. Moreover, the incorporation of PBS and PBSA didn’t improve PVDF/PBAT blends’ properties effectively.
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Tu, Hai Feng, and 屠海峰. "Fabrication and characterization of polyoxymethylene/polylactide blend-based nanocomposites." Thesis, 2018. http://ndltd.ncl.edu.tw/handle/j7g6ma.
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Sivanjineyulu, Veluri, and Veluri Sivanjineyulu. "Carbon Nanotube- and Organoclay-filled Bio-polymer Blend-based Nanocomposites with Enhanced Physical Properties." Thesis, 2019. http://ndltd.ncl.edu.tw/cgi-bin/gs32/gsweb.cgi/login?o=dnclcdr&s=id=%22107CGU05063018%22.&searchmode=basic.
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Huang, Chiao Li, and 黃巧俐. "Foaming of PVDF/PMMA Blend-based Nanocomposites through sc-CO2 and the Foams’ Properties Characterization." Thesis, 2010. http://ndltd.ncl.edu.tw/handle/00911732111033569800.
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碩士長庚大學
化工與材料工程學系
98
Abstract The foaming of PVDF/PMMA blend-based nanocomposites through sc-CO2, and the resulting foams’ properties were studied. Two kinds of organoclays (20A and 30B) served as the nanofillers for the composites preparation. XRD patterns show that foaming condition and PMMA content did not affect the development of α crystalline form of PVDF, but the presence of organoclays induced the crystalline form of PVDF. The 30B exhibited a better compatibility with PVDF/PMMA than that of 20A as revealed by XRD and TEM experiments. SEM images show that, depending on the foaming condition and sample’s formulation, various cell morphologies of the foams were developed. For instance, the spherulitic structure of PVDF exerted a significant effect on the cell morphology of PVDF-rich foams. The cell appeared in the amorphous domains, which are mainly located between the PVDF spherulites and their interlamellar regions. The cell size was noted to increase with increasing PMMA content in the blends; the additions of organoclays led to a reduction in the cell size. The interesting crystallization and melting behaviors of the prepared samples were observed as well.
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AndiAuliawan and 安列望. "Biodegradable ternary blend comprising poly(L-lactic acid), poly(methyl methacrylate), poly(ethylene oxide) as matrix for organoclays nanocomposites." Thesis, 2011. http://ndltd.ncl.edu.tw/handle/93201961438772196790.
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Bock, Thorsten R. [Verfasser]. "Catalytic phosphonation of high performance polymers and POSS : novel components for polymer blend and nanocomposite fuel cell membranes / submitted by Thorsten R. Bock." 2007. http://d-nb.info/984196013/34.
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