Bibliografías temáticas / Methacrylic copolymer

Índice

Artículos de revistas
Tesis
Libros
Capítulos de libros
Actas de conferencias

Literatura académica sobre el tema "Methacrylic copolymer"

Autor: Grafiati

Publicado: 25 de mayo de 2024

Crea una cita precisa en los estilos APA, MLA, Chicago, Harvard y otros

Elija tipo de fuente:

Consulte las listas temáticas de artículos, libros, tesis, actas de conferencias y otras fuentes académicas sobre el tema "Methacrylic copolymer".

Junto a cada fuente en la lista de referencias hay un botón "Agregar a la bibliografía". Pulsa este botón, y generaremos automáticamente la referencia bibliográfica para la obra elegida en el estilo de cita que necesites: APA, MLA, Harvard, Vancouver, Chicago, etc.

También puede descargar el texto completo de la publicación académica en formato pdf y leer en línea su resumen siempre que esté disponible en los metadatos.

Artículos de revistas sobre el tema "Methacrylic copolymer"

Makarewicz, Edwin y Anna Zalewska. "Sedimentation of water dispersed systems of acrylate copolymers in xylene". Polish Journal of Chemical Technology 10, n.º 3 (1 de enero de 2008): 29–34. http://dx.doi.org/10.2478/v10026-008-0032-4.

Texto completo

Resumen

Sedimentation of water dispersed systems of acrylate copolymers in xylene Methyl methacrylate - butyl acrylate - methacrylic acid copolymer and butyl methacrylate - methacrylic acid amide copolymer of a different segmental structure were stabilised with non-ionic and anionic surfactants. Gel chromatography, viscosimetry, tensiometry, conductometry and sedimentation methods were applied to define the properties of the synthesized copolymers, surfactants in water solutions and water dispersions. The types and the properties of the phases being in a state of sedimentation balance were also determined. The obtained experimental data were interpreted and justified by using the copolymer and surfactants properties. The existing correlations were pointed out. The obtained results show that the stability of a disperse system considerably depends on the structure of the copolymer. The MMA/BA/MAA copolymer has monomeric units of elastic butyl acrylate. Segments containing these monomeric units adsorb surfactants much better and form more stable water disperse systems. However, the MBA/AMAA copolymer with the polarity of amide group of methacrylamide makes disperse systems less stable.

Los estilos APA, Harvard, Vancouver, ISO, etc.

Chansatidkosol, Siraprapa, Praneet Opanasopit y Prasert Akkaramongkolporn. "Tablet Disintegrant Derived from Crosslinked Methacrylic Acid and Divinylbenzene Copolymers". Advanced Materials Research 1060 (diciembre de 2014): 168–71. http://dx.doi.org/10.4028/www.scientific.net/amr.1060.168.

Texto completo

Resumen

Methacrylic acid copolymers crosslinked with 0.25-16 % divinylbenzene were synthesized by free radical polymerization using benzoyl peroxide as an initiator. The products were washed, dried and passed through a 80-mesh sieve prior to determining their infrared spectra, swelling capacity in water and disintegrant efficacy for microcrystalline cellulose (MCC) placebo tablet. The crosslinked methacrylic acid and divinylbenzene copolymers were successfully prepared as indicated by IR spectra, yielding around 50-80 %. The sieved particles of copolymers were white to faint yellow. In contact with water, they hydrated and swelled, where their swelling capacity was lowered with increasing the level of crosslink (divinylbenzene) in the copolymer structure. The copolymer with 0.25 % crosslink caused the MCC tablet to disintegrate fastest (1.2 min), corresponding to its highest swelling capacity. The disintegration efficacy increased with an increase in copolymer concentrations, but decreased with an increase in compression forces.

Los estilos APA, Harvard, Vancouver, ISO, etc.

Gorelov, Y. P., I. A. Shalaginova, Y. V. Volosova, P. V. Kornienko y K. V. Shirshin. "Heat and weather resistance of copolymer organic glasses". Plasticheskie massy, n.º 7-8 (11 de septiembre de 2019): 20–22. http://dx.doi.org/10.35164/0554-2901-2019-7-8-20-22.

Texto completo

Resumen

The parameters of light resistance, heat resistance and water absorption of organic glasses based on methyl methacrylate copolymers with various methacrylic monomers containing UV absorbers and UV stabilizers are investigated. It has been shown that UV stabilizers - quenchers of excited states: diphenyl and isomers of terphenyl have the best stabilizing eff ect. A decrease in water absorption of copolymer organic glasses with the introduction of cyclic fragments into the copolymer was established. It was shown that the introduction of methyl methacrylate - methacrylic acid into the system as a comonomer of cyclohexylmaleimide allows increasing the heat resistance of organic glasses.

Los estilos APA, Harvard, Vancouver, ISO, etc.

Ristic, Ivan, Ljubisa Nikolic, Vesna Nikolic, Jaroslava Budinski-Simendic y Vladimir Zdravkovic. "The influence of monomer molar ratio on the properties of copolymers based on methyl methacrylate and methacrylic acid". Chemical Industry 63, n.º 6 (2009): 611–19. http://dx.doi.org/10.2298/hemind0906611r.

Texto completo

Resumen

The application of polymers for controlled drug delivery is influenced by no toxicity and solubility in different pH mediums. There already are existing pharmaceutical medicaments based on aqueous dispersion of an anionic copolymer methyl acrylate, methyl methacrylate and methacrylic acid. The aim of this work was to synthesise copolymers of methyl methacrylate and methacrylic acid and to estimate the effects of monomers ratio (1:1 and 1:2) on the molecular mass, polydispersity index, and solubility of obtained polymers. Acetone was used as a solvent because both monomers and the initiator azobisisobutyronitrile are soluble in it. FTIR method was used for functional group characterization, the gel permeation chromatography method for average molecular weights and the distribution of molecular weights determinations. High pressure liquid chromatography (HPLC) was applied for the estimation of residual monomers in obtained copolymers. The titration with ethanol solution of NaOH was used for assessing of monomer units in copolymers. The copolymer with the molar ratio of monomers 1:1 was soluble in water bufer with pH values higher then 6, while the copolymer with the molar ratio of monomers 1:2 was soluble in bufer with pH higher then 9.

Los estilos APA, Harvard, Vancouver, ISO, etc.

Park, Yu-Ri, Jeong-A. Yu y Joon-Seop Kim. "Aggregation Behavior of Na-Neutralized Styrene-Ran-Methacrylic Acid Copolymers in Aqueous Solution". Journal of Nanoscience and Nanotechnology 7, n.º 11 (1 de noviembre de 2007): 3920–25. http://dx.doi.org/10.1166/jnn.2007.088.

Texto completo

Resumen

The aggregation behavior of un-neutralized, partly and fully Na-neutralized poly(styrene-ranmethacrylic acid) copolymers in aqueous solution was investigated using a SEM technique. It was observed that the un-neutralized copolymer formed spherical particles on the Si wafer, and the average size of particles was ca. 160 nm. The particle sizes did not change much with acid content. Upon the neutralization of the acid groups of the copolymer with NaOH, the copolymer became more hydrophilic, leading to the formation of network-like feature consisting of much smaller particles (<50 nm), compared to those of the acid copolymers. With increasing ionization, the boundary of the particles forming networks faded away, implying the formation of tubular structures.

Los estilos APA, Harvard, Vancouver, ISO, etc.

Kamorin, D. M., K. V. Shirshin, V. D. Kavtrova, Y. V. Sak, E. A. Timchenko y A. S. Simagin. "Solution properties of amphiphilic amino- and oligoethylene glycol-containing methacrylic copolymers". Plasticheskie massy 1, n.º 11-12 (20 de enero de 2022): 40–42. http://dx.doi.org/10.35164/0554-2901-2021-11-12-40-42.

Texto completo

Resumen

The behavior of methacrylic copolymers with oligoethylene glycol and amine groups in aqueous solutions has been studied. The eff ect of the composition of copolymers of alkoxyoligo(ethylene glycol) methacrylates and N-[3-(dimethylamino) propyl] methacrylamide on their solubility in aqueous media, aggregation properties and surface activity at the water-oil phase boundary was demonstrated. The presence of thermo- and pH-responsive properties, characterized by lower critical solution temperature, has been shown. Polymers exhibit high interfacial activity at the water-toluene interface, which increases with an increase in the proportion of methacrylic ether units in the copolymer. For polymers in aqueous media the value of the critical micelle concentration was found in the region of 10-3 g/L.

Los estilos APA, Harvard, Vancouver, ISO, etc.

Tang, Xiao Fen, Wei Li y Xing Xiang Zhang. "New Approach to Fabricate Microcapsules with Comb-Like Copolymer Shell by Phase Separation Method". Advanced Materials Research 860-863 (diciembre de 2013): 577–81. http://dx.doi.org/10.4028/www.scientific.net/amr.860-863.577.

Texto completo

Resumen

Microcapsules containingn-octadecane (MicroC18) withn-octadecyl methacrylate (ODMA)-methacrylic acid (MAA) copolymer shell were fabricated through phase separation method, in which the shell-forming copolymers synthesized by free-radical solution polymerization. Meanwhile, theses copolymers were employed as the surfactant during microencapsulation. The crystallization temperature and crystallinity degree of comb-like copolymer display a gradual decrease with an increase the molar ratio of MAA. MicroC18 with spherical profiles and the diameter ranging from 3 to 20 μm were fabricated. In addition, the system pH value plays an important role in the formation process of microcapsules and the optimum value of pH in the range of 8.5-10.5.

Los estilos APA, Harvard, Vancouver, ISO, etc.

Hook, Thomas J., Joseph A. Gardella y Lawrence Salvati. "Multitechnique surface spectroscopic studies of plasma-modified polymers II: H2O/Ar plasma-modified polymethylmethacrylate/polymethacrylic acid copolymers". Journal of Materials Research 2, n.º 1 (febrero de 1987): 132–42. http://dx.doi.org/10.1557/jmr.1987.0132.

Texto completo

Resumen

Results from the x-ray photoelectron spectroscopy (XPS or ESCA), ion scattering spectroscopy (ISS or LEIS), and Fourier transform infrared spectrometry (FTIR) analyses are presented for unmodified and modified poly (methylmethacrylate)/poly (methacrylic acid) (PMMA/PMAA) copolymer films. Analyses of the unmodified PMMA/PMAA copolymer series, via ESCA, ISS, and FTIR, established the surface composition and functionality of the PMMA/PMAA copolymers before the H2O/Ar rf-plasma treatment was employed. The ESCA, ISS, and FTIR analysis of these modified PMMA/PMAA copolymers show that surface modification over a limited depth (50–200 Å) has occurred. The composition, bonding, and functionality changes of the surfaces are discussed. A two-step modification mechanism (surface reduction of the PMMA/PMAA copolymer followed by H2O adsorption) is proposed to interpret the spectroscopic results.

Los estilos APA, Harvard, Vancouver, ISO, etc.

Tuzar, Zdeněk, Pavel Kratochvíl, Karel Procházka y Petr Munk. "Block Copolymer Micelles in Aqueous Media". Collection of Czechoslovak Chemical Communications 58, n.º 10 (1993): 2362–69. http://dx.doi.org/10.1135/cccc19932362.

Texto completo

Resumen

Micellization of di- and triblock copolymers, poly(methacrylic acid)-block-polystyrene and poly(methacrylic acid)-block-polystyrene-block-poly(methacrylic acid), varying in molecular weight and composition, has been studied by static and dynamic light scattering, and sedimentation velocity. Micelles with polystyrene cores were prepared in water-dioxane mixtures, rich in dioxane, and transferred into water-rich mixtures, water, and aqueous buffers via stepwise dialysis. It has been shown that, in dioxane-rich mixtures, the micellar system was in dynamic equilibrium, while in water-rich solvents, water, and aqueous buffers the micellization equilibrium was frozen and micelles behaved like autonomus particles. Under certain conditions, micelles were accompanied by independent large particles. This phenomenon, known from other micellar systems as an "anomalous micellization", is discussed.

Los estilos APA, Harvard, Vancouver, ISO, etc.

Nikolic, Vladimir, Sava Velickovic, Dusan Antonovic y Aleksandar Popovic. "Biodegradation of starch–graft–polystyrene and starch–graft–poly(methacrylic acid) copolymers in model river water". Journal of the Serbian Chemical Society 78, n.º 9 (2013): 1425–41. http://dx.doi.org/10.2298/jsc121216051n.

Texto completo

Resumen

In this paper the biodegradation study of grafted copolymers of polystyrene (PS) and corn starch and poly(methacrylic acid) and corn starch in model river water is described. These copolymers were obtained in the presence of different amine activators. The synthesized copolymers and products of degradation were characterized by Fourier Transform Infrared Spectroscopy (FTIR) and Scanning Electron Microscopy (SEM). Biodegradation was monitored by mass decrease and number of microorganisms by Koch?s method. Biodegradation of both copolymers advanced with time, poly(methacrylic acid)-graft-starch copolymers completely degraded after 21 day, and polystyrene-graft-starch partially degraded (45.78-93.09 % of total mass) after 27 days. Differences in the degree of biodegradation are consequences of different structure of the samples, and there is a significant negative correlation between the share of polystyrene in copolymer and degree of biodegradation. The grafting degree of PS necessary to prevent biodegradation was 54 %. Based on experimental evidence, mechanisms of both biodegradation processes are proposed, and influence of degree of starch and synthetic component of copolymers on degradation were established.

Los estilos APA, Harvard, Vancouver, ISO, etc.

Más fuentes

Tesis sobre el tema "Methacrylic copolymer"

Tuzcu, Gozde. "2-acrylamido-2-methyl-1-propanesulfonic Acid -methacrylic Acid Copolymer And Its Polyethylene Glycol Methyl Ether Derivatives As Superplasticizers In Concrete". Master's thesis, METU, 2008. http://etd.lib.metu.edu.tr/upload/3/12609380/index.pdf.

Texto completo

Resumen

Polymers in concrete have received considerable attention over the past 30 years. Superplasticizers are one of the admixtures which have polymeric structure. In this study, polycarboxylate type slump-releasing dispersant, which is a copolymer of 2-acrylamido-2-methyl-1-propanesulfonic acid (AMPS) and methacrylic acid (MAA), was synthesized in different feed compositions. The synthesis procedure of this copolymer was retrieved from literature. The derivatives of this water-soluble copolymer (AMPS-MAA) were synthesized by a macromonomer which was synthesized by the esterification of poly(ethylene glycol) methyl ether (PEG) with MAA (PEGMA) and then copolymerizing this macromonomer with AMPS monomer, the resulting copolymer is AMPS-PEGMA. In order to study the methyl group effect on fluidity, the other type of macromonomer (PEGA), composed of PEG and acrylic acid (AA), was synthesized and copolymerized with AMPS monomer, giving AMPS-PEGA. The structures of synthesized polymers were verified by NMR and FT-IR analysis. The slump-releasing effect of the synthesized copolymers was studied in terms of reaction pH, composition, molecular weight, amount of PEG side chains, and molecular weight of PEG side chains. The AMPS-MAA copolymer with 40% AMPS content was the most effective in promoting the fluidity of cement pastes. In scope of reaction pH, the AMPS-MAA copolymer, synthesized at a pH of 11, gave the most effective result on fluidity of the cement pastes. In copolymers of PEG acrylate macromonomers and AMPS monomers, copolymers with 5% PEG acrylate content showed the highest fluidity both in copolymers of PEGA and PEGMA. In copolymers with PEG side chains, the 15% AMPS-PEGA copolymer synthesized at pH of 6 gave the most effective result on fluidity of cement pastes. In the study of mechanical properties of the mortar samples prepared by the copolymers selected, AMPS-PEGA copolymer with 25% PEG content showed the highest flexural strength, and AMPS-MAA copolymer with 60% AMPS content and a reaction pH of 11 gave the highest compressive strength. In this study, zeta potential measurements were also performed to analyze the fluidity behavior of the copolymers.

Los estilos APA, Harvard, Vancouver, ISO, etc.

Frenzel, Ralf, Christa Blank, Karina Grundke, Veneta Hein, Bernd Schmidt, Frank Simon, Michael Thieme y Hartmut Worch. "Wettability of Methacrylate Copolymer Films Deposited on Anodically Oxidized and Roughened Aluminium Surfaces". Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2013. http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-107056.

Texto completo

Resumen

The wetting behavior of water on methacrylate copolymer films was studied on anodically oxidized and micro-roughened aluminium surfaces and also on smooth model surfaces. The copolymerization of tert-butyl methacrylate with a methacrylate containing a fluoroorganic side chain led to a considerable decrease of the surface free energy, but not to a superhydrophobic behavior of polymer-coated, micro-roughened aluminium surfaces. However, copolymers containing both hydrophobic and hydrophilic sequences are able to form superhydrophobic films. X-ray photoelectron spectroscopy showed that an enrichment of the interface between the solid phase and the air by fluorine-containing polymer components was the reason for the strong decrease of the surface free energy. The hydrophilic segments of the copolymers improved the ability to wet the highly polar aluminium surface and to form films of higher density.

Los estilos APA, Harvard, Vancouver, ISO, etc.

Frenzel, Ralf, Christa Blank, Karina Grundke, Veneta Hein, Bernd Schmidt, Frank Simon, Michael Thieme y Hartmut Worch. "Wettability of Methacrylate Copolymer Films Deposited on Anodically Oxidized and Roughened Aluminium Surfaces". Technische Universität Dresden, 2009. https://tud.qucosa.de/id/qucosa%3A26713.

Texto completo

Resumen

Los estilos APA, Harvard, Vancouver, ISO, etc.

DePorter, Craig Donald. "Synthesis and characterization of well-defined methacrylic-based block ionomers". Diss., This resource online, 1991. http://scholar.lib.vt.edu/theses/available/etd-07282008-134318/.

Texto completo

Los estilos APA, Harvard, Vancouver, ISO, etc.

Cavallo, Valentina. "Tailoring intermolecular interactions in methacrylate-based copolymers and nanocomposites : Effect on molecular dynamics and thermal properties". Electronic Thesis or Diss., Lyon, INSA, 2023. http://www.theses.fr/2023ISAL0103.

Texto completo

Resumen

Une corrélation entre l’intensité et la nature des interactions intermoléculaires et les propriétés physiques, comme la conductivité thermique, a été rapportée pour des polymères amorphes. En particulier, une augmentation de la conductivité thermique a été associée à l’ajout d’interactions plus fortes par rapport aux liaisons de Van der Walls faibles, c’est-à-dire des liaisons hydrogène et ioniques. Dans ce travail, une tentative d'adapter la conductivité thermique dans les polymères amorphes a été réalisée par ingénierie des interactions intermoléculaires. Le poly(méthylméthacrylate) PMMA a été utilisé comme modèle et des copolymères poly(méthylméthacrylate-co-acide méthacrylique) (PMMA-co-MAA) ont été synthétisés par copolymérisation radicalaire afin d'introduire des liaisons H inter-chaînes et, après neutralisation, des liaisons ioniques. Des copolymères ont été obtenus avec succès jusqu'à 30 % en poids de MAA et caractérisés. Différents comonomères ont été utilisés pour évaluer l'influence d'une unité flexible apportant des liaisons H, le 2-hydroxyéthylméthacrylate (HEMA) ou le 2-carboxyéthylacrylate (CEA). La conductivité thermique a légèrement augmenté en augmentant la teneur en MAA et HEMA, tandis que pour les copolymères CEA, la présence de défauts a empêché la mesure. Le copolymère PMMA-co-MAA a été utilisé comme matrice pour les nanocomposites à base de cellulose afin d'adapter la compatibilité des charges, grâce à la présence de liaisons H entre l'unité MAA et la surface de la cellulose. Des nanofibres de cellulose (CNF) jusqu'à 15 % en poids ont été efficacement dispersées par coulée de solvant dans un mélange de deux solvants (THF/MeOH). La conduction thermique n'a montré aucun changement significatif après l'introduction des CNF. L'analyse mécanique dynamique (DMA) et la spectroscopie diélectrique à large bande (BDS) ont été utilisées en combinaison pour caractériser pleinement la dynamique moléculaire du PMMA-co-MAA copolymère suite à l'introduction de liaisons H inter-chaînes et à l'ajout ultérieur de CNF. Une relaxation β’ supplémentaire, caractérisée par une énergie d’activation (Ea) presque quatre fois plus élevé que le Ea(β), a été trouvée pour les nanocomposites et attribuée à l’établissement de liaisons H entre les groupes -COOH de la matrice et les groupes hydroxyles du CNF. Ainsi, une étude plus approfondie de la relaxation α a permis de révéler l’influence du CNF confirmant la présence de liaisons H interfaciales. En effet, malgré les Tgs similaires caractérisant la matrice et les nanocomposites, un décalage de leurs temps de relaxation vers des températures plus élevées a été observé suite à l’ajout de CNF. Les résultats rapportés dans cette thèse ont mis en évidence que les améliorations de la conductivité thermique obtenues par la modification des interactions entre les chaînes dans les matrices amorphes restent un défi extrêmement complexe
A correlation between the strength of the intermolecular interactions and physical properties has been reported for amorphous polymers. In particular, an increment of thermal conductivity has been associated to the addition of stronger interactions compared with weak van der Walls, i.e. hydrogen and ionic bonds. In this work, an attempt to tailor thermal conductivity in amorphous polymers has been made by engineering intermolecular interactions. Poly(methylmethacrylate) PMMA was used as standard and poly(methylmethacrylate-co-methacrylic acid) (PMMA-co-MAA) copolymers were synthesised by free radical copolymerization in order to introduce inter-chain hydrogen bonds and, after neutralisation, ionic bonds. Copolymers were successfully obtained up to 30wt% of MAA and characterized. Also, different comonomers were used to evaluate the influence of a flexible unit bringing H-bonds, 2-hydroxyethylmethacrylate (HEMA) or 2-carboxyethylacrylate (CEA). Thermal conductivity slightly increased increasing MAA and HEMA content, while for CEA copolymers the presence of defects prevented the measurement. Later, PMMA-co-MAA was used as a matrix for cellulose-based nanocomposites to tailor filler compatibility, thanks to the presence of H-bonds between MAA unit and cellulose surface. Cellulose nanofibers (CNF) up to 15wt% were efficiently dispersed by solvent casting in a mixture of two solvents (tetrahydrofuran/methanol). Thermal conduction showed no significant changes following the introduction of CNF. Dynamic mechanical analysis (DMA) and broadband dielectric spectroscopy (BDS) were used in combination to fully characterize the macromolecular mobility of PMMA-co-MAA following the introduction of inter-chain H-bonds and the subsequent addition of CNF. An additional β’-relaxation, characterized by an activation energy (Ea) nearly four times higher than the Ea(β), was found for the nanocomposites and ascribed to the establishment of H-bonds between the -COOH groups of the matrix and the hydroxyl groups of CNF, as confirmed by the lower values found for the thermal expansion coefficient of the free volume and the fragility of the material. A deeper investigation about the α-relaxation was able to reveal the influence of CNF confirming the presence of interfacial H-bonds. Indeed, despite the similar glass transition temperatures characterising the matrix and the nanocomposites, a shift of their relaxation times to higher temperatures was observed following the addition of CNF. Results reported in this thesis evidenced that the enhancements of thermal conductivity obtainable by the modification of the interchain interactions between chains in amorphous matrices remains an extremely complex challenge

Los estilos APA, Harvard, Vancouver, ISO, etc.

Kannan, Nirmal Balaji. "Poly(Pentafluorostyrene)-b-Poly(Methacrylic acid) Amphiphilic Block Copolymers via Nitroxide Mediated Polymerization". Thesis, Université d'Ottawa / University of Ottawa, 2016. http://hdl.handle.net/10393/35294.

Texto completo

Resumen

Fluoropolymers are a versatile and attractive group of compounds having an interesting mix of properties that make them highly useful for various applications. Because of strong bonding between the carbon and fluorine atom, they exhibit unique physical and chemical properties such as high thermal stability, increased chemical resistance, low refractive index, enhanced inertness towards many solvents and hydro-compounds. These characteristics have led them to be widely used in aerospace, aeronautics, optics, microelectronics, paints and coatings, and engineering structures and as biomaterials. Amphiphilic copolymers possess unique solution and solid-state properties due to their well-defined molecular architecture. These properties arise as the result of covalently combining two thermodynamically different polymer blocks that phase separate on the nanoscale. Amphiphilic copolymers based on a fluoro-monomer will combine the favourable physiochemical properties of the desired fluorine segment in combination with complementary hydrophilic segments. Such fluorinated amphiphilic copolymers are potentially useful for drug delivery vehicles and membrane applications. This project is aimed at making fluorinated amphiphilic block copolymers of hydrophobic 2, 3, 4, 5, 6 –pentafluorostyrene (PFS) and hydrophilic methacrylic acid (MAA). A controlled radical polymerization mechanism, nitroxide mediated polymerization (NMP) using NHS-BlocBuilder as the initiator was employed. The advantage of using NMP is that it facilitates the synthesis of copolymers with well-controlled narrow molecular weight distribution. However, methacrylate homopolymerization by NMP is challenging due to the high dissociation equilibrium constant therefore, the use of PFS as a controlling comonomer was explored. We established that to obtain a controlled copolymerization, a minimum of 70 mol% PFS was required, which is significantly greater than other copolymerization systems such as using as little as 4.5-8 mol% styrene to control the copolymerization of MAA. We surmise that this lack of control is due to the unfavourable reactivity ratios (Appendix I) which favour the addition of MAA rather than PFS (rPFS = 0.012, rMAA = 8.12). However, these unique reactivity ratios suggest that a semi-batch approach can be utilized to synthesize almost pure block copolymers in one pot. Therefore, poly(PFS)–b-(PFS-ran-MAA) block copolymers were synthesized and characterized by a semi batch addition of MAA. While successful, the concentration of irreversibly terminated chains was evident and greater care in reducing these unwanted reactions needs to be addressed.

Los estilos APA, Harvard, Vancouver, ISO, etc.

Kalista, Stephen James Jr. "Self-Healing of Thermoplastic Poly(Ethylene-co-Methacrylic Acid) Copolymers Following Projectile Puncture". Thesis, Virginia Tech, 2003. http://hdl.handle.net/10919/36186.

Texto completo

Resumen

Poly(ethylene-co-methacrylic acid) (EMAA) ionomer polymers carry great potential for use in a wide variety of unique applications due to their property of “self-healing” following projectile impact. Following puncture, certain films based on these materials are observed to “heal”, with the penetration opening recovering to an air-tight condition. Specifically, four polymers of this class were examined, including DuPont™ Surlyn® 8920, Surlyn® 8940, Nucrel® 925, and Nucrel® 960. Though these differ in their amount of ionic content, all expressed a certain degree of self-healing. Thin films were prepared by a compression molding process and punctured at temperatures ranging from room up to that of the melt using a pellet gun. Samples were then assessed for self-healing. A quantitative post-puncture burst-test method examined the strength or quality of the healed site in the four examples. A comparison of this data provided an understanding of the importance of ionic content and the mechanism of puncture healing. Additional damage modes were also examined to determine other cases where healing occurs and the requirements necessary to elicit the healing response. In addition, interesting composite materials consisting of carbon nanotube filled ionomers were fabricated by a melt-mixing process which produced potentially self-healing composites with superior mechanical properties. By comparing peel testing, projectile testing, the quantitative healed strength, and other characteristics, it was determined that healing is not a function of the ionic content of the materials involved. Further, healing was determined to occur due to a synergy of thermomechanical properties facilitated by the addition of the methacrylic acid groups to the polymer backbone.
Master of Science

Los estilos APA, Harvard, Vancouver, ISO, etc.

Miles, Andrew. "Copolymers of methacrylic acid and itaconic acid derivatives as thermally crosslinkable electron resists". Thesis, University of Stirling, 1988. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.236050.

Texto completo

Los estilos APA, Harvard, Vancouver, ISO, etc.

Alshuiref, Abubaker. "Synthesis and characterization of two novel urethane macromonomers and their methacrylic/urethane graft copolymers". Thesis, Stellenbosch : University of Stellenbosch, 2010. http://hdl.handle.net/10019.1/4022.

Texto completo

Resumen

Thesis (PhD (Chemistry and Polymer Science))--University of Stellenbosch, 2010.
ENGLISH ABSTRACT: Polymethacrylates are well known adhesives and can carry specific functionality, but have the disadvantage that their flexible backbones impart limited thermal stability and mechanical strength. Polyurethanes (PUs) are finding increasing application and use in many industries due to their advantageous properties, such as a wide range of flexibility combined with toughness, high chemical resistance and excellent weatherability. PUs do however have some disadvantages, for instance, PU is considered an expensive polymer, especially when considered for solvent based adhesives. the focus of this study was to consider a largely unstudied area of PU chemistry, namely combining PUs with polymethacrylates. Two types of linear urethane macromers (UMs) UM1 and UM2 were synthesized by the polyaddition polymerization of 4,4'-methylenediphenyl diisocyanate (MDI) with ethylene glycol (EG), and MDI with neopentylglycol (NPG), via a pre-polymer method, followed by termination with 2-hydroxy ethylacrylate (2-HEA) and methanol (MeOH) to yield UMs having specific urethane chain lengths, and which have to be predominantly monofunctional. Structural identification of the UMs was verified by MALDI-TOF-MS, FTIR, 13C-NMR and 1HNMR spectroscopy.Various percentages of the respective UMs (0_55 wt % of methacrylate monomers) were then incorporated into polymethyl methacrylate (PMMA) and poly n-butyl methacrylate (PnBMA) backbones via solution free-radical copolymerization. The resulting methyl methacrylate-g-urethane and n-butyl methacrylate-g-urethane copolymers were characterized by 1H-NMR,13C-NMR, FTIR, SEC with double detectors (UV and RI), light scattering, UV-Vis, HPLC, TGA, DSC, DMA and TEM. Weight percentages of UM incorporated into the methyl methacrylate-g-urethane copolymers were calculated using FTIR, UV-Vis and 1H-NMR techniques. Phase separation which occurred between the urethane segment and methacrylate segment in the graft copolymerization products was investigated by DMA, DSC and TEM analysis. Microphase separation occurred in all PMMA-g-UM1 and PnBMA-g-UM1 copolymers: two glass transitions temperatures corresponding to the PMMA or PnBMA and UM1 fractions, respectively, were observed. On the other hand, DMA and DSC results showed that in most graft copolymer products the two respective component parts PMMA-g-UM2 or PnBMA-g- UM2 were compatible, because only one Tg was observed. Two glass transitions occurred for PMMA or PnBMA and UM2 when the amount of UM was increased to 55 wt % during copolymerization and microphase separation was evident in DSC, DMA and TEM measurements. Thermal stability and storage modulus (stiffness) of all the synthesized PMMA-g-urethane and PnBMA-g-urethane copolymers increased as the concentration of urethane macromonomer in the copolymerization feed increased, as confirmed in TGA and DMA results. The surface and adhesive properties of the synthesized graft copolymer were studied by measuring the static contact angle and peel strength. Adhesion increased as the content of UMs increased in the graft copolymer. The graft copolymers prepared using a high UM2 feed for both PMMA and PnBMA showed improved in adhesion compared to the pure methacrylate polymers. The adhesion was better for both leather and for vinyl.
AFRIKAANSE OPSOMMING: Polimetakrilate is bekende kleefstowwe. Hulle het egter die tekortkoming dat hulle buigbare ruggraat beperkte termiese en meganiese stabliteit besit. Poliuretane (PUs) word deesdae al hoe meer gebruik in baie nywerhede as gevolg van hulle baie voordele, insluitend hul wye buigsaamheid tesame met sterkte, hoë chemiese weerstand en uitstekende weerbaarheid. PUs het egter ’n paar nadele: hulle is baie duur, veral wanneer hulle gebruik word in oplosmiddel-gebaseerde kleefstowwe. Die doel van hierdie studie is om die kombinering van PUs met polimetakrilate te bestudeer, 'n onderwerp wat tot dusver baie min aandag-getrek het. Twee tipes liniêre uretaanmakromere (UMs), UM1 en UM2, is gesintetiseer deur gebruik te maak van poliaddisiepolimerisasie van 4,4'-metileendifeniel diisosianaat (MDI) met etileenglikol (EG), en MDI met neopentielglikol (NPG), via ‘n prepolimeermetode, gevolg deur terminering met 2-hidroksiëtielakrilaat (2-HEA) en metanol (MeOH). Die produk hiervan is UMs met spesifieke kettinglengtes (hoofsaaklik monofunksioneel). Die samestelling van die UMs is met behulp van die volgende gevorderde analitiese tegnieke bepaal: MALDI-TOFMS, FTIR, 13C-NMR en 1H-NMR. Verskillende hoeveelhede van die UMs (0_55 gewIing% metakrilaatmonomere) is dan in die polimetielmetakrilaat (PMMA) en poli-n-butielmetakrilaat (PnBMA) ruggrate geïnkorporeer deur middel van oplossing-vryradikaalpolimerisasie. Die samestelling van die kopolimeerprodukte, metiel-metakrilaat-g-uretaan en n-butiel-metakrilaat-g-uretaan, is met behulp van die volgende gevorderde analitiese tegnieke bepaal: 1H-NMR, 13C-NMR, FTIR, SEC met dubbele detektors (UV en RI), ligverstrooiing UV-Vis, HPLC, TGA, DSC, DMA en TEM. Die hoeveelheid UM geïnkorporeer in die metielmetakrilaat-g-uretaan kopolimere is bereken deur gebruik te maak van FTIR, UV-Vis en 1H-NMR data. Die faseskeiding wat plaasgevind het tussen die uretaansegment en die metakrilaatsegment in die produkte van die entpolimerisasie is met behulp van DMA, DSC en TEM ondersoek. In alle PMMA-g-UM1 en PnBMA-g-UM1 kopolimere het mikrofaseskeiding plaasgevind: twee verskillende glasoorgangstemperature vir die PMMA of PnBMA en UM1 fraksies is waargeneem. Hierteenoor het DMA en DSC resultate getoon dat in die meeste entkopolimeerprodukte (PMMA-g-UM2 of PnBMA-g-UM2) was die twee komponente verenigbaar, aangesien net een Tg waargeneem is. In die geval van die kopolimere waar die hoeveelheid UM in die kopolimerisasiereaksies tot 55 gew% verhoog is, is twee glasoorgangstemperature vir PMMA of PnBMA, en UM2 waargeneem. Mikrofaseskeiding is met behulp van DSC, DMA en TEM bewys. Termiese stabiliteit en stoormodulus (styfheid) van alle gesintetiseerde PMMA-g uretaan en PnBMA-g-uretaan kopolimere het toegeneem namate die uretaankonsentrasie in die kopolimerisasiereaksie toegeneem het soos deur middel van TGA en DMA resultate bewys is. Die oppervlakte- en kleefeienskappe van die bereide entkopolimere is bestudeer deur die statiese-kontakhoek en skilkrag te meet. Adhesie het toegeneem namate die UMinhoud toegeneem het. Die entkopolimere berei met hoë PMMA en PnBMA inhoud het uiteindelik beter adhesie getoon as die suiwer metakrilaatpolimere. Die adhesie was beter vir beide leer en viniel.

Los estilos APA, Harvard, Vancouver, ISO, etc.

Berndt, Andreas. "Synthese und Charakterisierung lösungsprozessierbarer und vernetzbarer Methacrylat-Copolymere für den Einsatz als Dielektrika in der organischen Elektronik". Doctoral thesis, Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2016. http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-211995.

Texto completo

Resumen

Der Einsatz von organischen Materialien, insbesondere von Polymeren, hat zahlreiche Vorteile gegenüber dem Einsatz klassischer Materialien in der Mikroelektronik. Zu diesen zählen Flexibilität, geringes Gewicht, Verarbeitbarkeit durch Verfahren aus Lösung bei Raumtemperatur ohne Notwendigkeit vakuumbasierter Prozesse zur Abscheidung und vieles mehr. Dies ermöglicht eine energie- und kosteneffiziente Herstellung elektronischer Bauteile wie organische Feldeffekttransistoren (OFETs) oder Leuchtdioden (OLEDs), welche durch Prozesse wie dem Rolle-zu-Rolle-Druckverfahren nicht länger auf kleine Flächen begrenzt sind. Zur Herstellung polymerbasierter OFETs mit optimiertem Eigenschaftsprofil sind neben innovativen Halbleitern vor allem auch neue Dielektrika mit verbesserten elektrischen Eigenschaften erforderlich, zu deren Entwicklung die vorliegende Arbeit beitragen sollte. Das häufig verwendete Polymethylmethacrylat ist für den Einsatz als Gate-Dielektrikum für die organische und gedruckte Elektronik nur bedingt geeignet. Es zeigt einige Nachteile wie eine mangelnde Stabilität gegenüber bestimmten organischen Lösungsmitteln, was zu Quellung oder Anlösen des Dielektrikums während des Aufbringens weiterer Schichten führen kann. Durch Copolymerisation von Methylmethacrylat mit funktionalisierten Comonomeren sollten die Probleme gelöst und optimierte Methacrylat-Copolymere entwickelt werden. Die Copolymere wurden über freie radikalische sowie RAFT-Polymerisation synthetisiert. Allen gemeinsam sind vernetzbare Comonomere, um die Lösungsmittelstabilität zu verbessern und somit die Durchbruchfeldstärke des Dielektrikums zu erhöhen. Als Vernetzer wurden 4-Benzoylphenylmethacrylat (BPMA) oder Propargylmethacrylat (PgMA) gewählt. BPMA ist UV-vernetzbar, Copolymere mit PgMA können in Gegenwart von mehrfunktionalen Aziden wie 1,3,5-Tris(azidomethyl)benzen (TAMB) durch Click-Reaktion thermisch vernetzt werden. Ein weiterer Aspekt ist die Erhöhung der relativen Permittivität des Dielektrikums zur Steigerung der Kapazität der dielektrischen Schicht, wodurch unter anderem die Betriebsspannung des Transistors reduziert werden kann. Dieses Ziel sollte durch Komposite mit BaTiO3-Nanopartikeln erreicht werden. Zusätzlich zur Steigerung der Permittivität kann dies durch Verringerung der Filmdicke realisiert werden, was jedoch vermehrt zu Leckströmen führen könnte. Neben den dielektrischen Materialeigenschaften spielt vor allem auch die Grenzfläche zwischen Dielektrikum und Halbleiter eine wesentliche Rolle. Um die Interaktionen an dieser zu verbessern, wurden Comonomere mit selbstorganisierenden Seitenketten in die Polymerstruktur eingebracht. Die Kombination dieser Dielektrika mit chemisch angepassten Halbleitern mit vergleichbaren Seitenkettenfunktionalitäten soll dazu führen, dass die beiden Komponenten durch die Seitenketten verstärkt miteinander wechselwirken. Monomersynthesen sowie anschließende Copolymerisationen waren in hohen Ausbeuten und ausreichenden Molmassen bezüglich der Copolymere erfolgreich. Die strahleninduzierte Vernetzung konnte durch systematische Untersuchungen optimiert und die thermische Vernetzung bei moderaten Temperaturen nachgewiesen werden. Die Vernetzbarkeit von Copolymeren mit selbstorganisierenden Seitenketten erwies sich als gehindert. Hierfür wurde ein Vorschlag zur Erhöhung der Flexibilität der Vernetzerseitenkette unterbreitet. Für die Copolymere P(MMA/BPMA) und P(MMA/PgMA) konnten die Durchbruchfeldstärken in Folge der Vernetzung von < 0.3 MV/cm für PMMA auf bis zu mehr als 5 MV/cm gesteigert werden. BaTiO3-Nanopartikel konnten durch geeignete Methoden erfolgreich synthetisiert werden. Durch Variation der Reaktionsbedingungen war eine gezielte Steuerung der Primärpartikelgröße möglich. So wurden Partikel der Größe < 10 nm, 26 nm und 55 nm realisiert. Die Dispersion der Partikel in organischen Lösungsmitteln sowie in der Polymermatrix war stark abhängig von der Größe der Primärartikel, der Oberflächenmodifikation sowie der Neigung zur Agglomeration. Modifizierte Partikel mit einem Durchmesser < 10 nm konnten sehr gut in Lösungsmitteln wie auch in der Polymermatrix dispergiert werden (Abbildung 2). Eine Steigerung der relativen Permittivität der Nanokomposite blieb jedoch aufgrund der zu geringen Größe der Primärpartikel aus. Darüber hinaus wurden deutlich schlechtere Durchbruchfeldstärken beobachtet. Copolymere mit der Fähigkeit zur Selbstorganisation sollten durch zwei Konzepte realisiert werden. Im ersten System führte die Polymerisation von x-[4-(4´-Cyanophenyl)phenoxy]alkylmethacrylaten mit Spacerlängen von x = 6 und x = 8 nur in Homopolymeren zu ausgeprägter Selbstorganisation. Copolymere mit 50 mol% waren weitgehend isotrop und wiesen zudem ungenügende dielektrische Eigenschaften auf. Das zweite System basiert auf semifluorierten Methacrylat-Copolymeren mit H10F10-Seitenketten (10 CH2- und 10 CF2-Gruppen). Diese zeigten schon ab einem Gehalt von circa 35 mol% gute Selbstorganisation und bildeten ein geordnetes alternierendes Schichtsystem aus Haupt- und Seitenketten im Bulk und in dünnen Filmen. Die dielektrischen Eigenschaften können mit denen bekannter fluorierter Polymerdielektrika wie CYTOP konkurrieren. Damit stehen die semifluorierten Copolymere zukunftsorientiert zur Kombination mit Halbleitern, welche die gleichen Seitenkettenfunktionalitäten tragen, bereit, um so durch starke Interaktionen zwischen Dielektrikum und Halbleiter die Grenzfläche zu optimieren. Mit thermisch vernetztem P(MMA/PgMA) konnten OFETs mit den Halbleitern Pentacen bzw. C60 erfolgreich hergestellt und vermessen werden. Beide Transistoren liefern gute und mit Literaturwerten vergleichbare Kenngrößen. Die Ladungsträgermobilitäten und Ion/Ioff-Verhältnisse betragen 0.3 cm²/Vs und 6.0x10^5 im Pentacen-basierten Transistor beziehungsweise 1.3 cm²/Vs und 4.4x10^5 im OFET mit dem Halbleiter C60. Damit konnte in dieser Arbeit die Steigerung der Durchbruchfeldstärke durch geeignete Vernetzung der Copolymere realisiert werden. Die thermische Vernetzung fand bei deutlich geringeren Temperaturen als zahlreiche in der Literatur beschriebene Reaktionen statt. Die Synthese und Modifizierung von BaTiO3-Nanopartikeln und auch die Bildung entsprechender PMMA-BaTiO3-Nanokomposite war erfolgreich, führte jedoch nicht wie erwartet zu einer Steigerung der relativen Permittivität der Dielektrika-Schichten. Vernetzbare und selbstorganisierende semifluorierte Methacrylat-Copolymere konnten polymerisiert und charakterisiert werden und stehen als innovative dielektrische Materialien für Untersuchungen in OFETs zur Verfügung. Das Copolymer P(MMA/PgMA) wurde zielführend in organischen Feldeffekttransistoren eingesetzt und führte zu guten elektrischen Eigenschaften der Bauteile.

Los estilos APA, Harvard, Vancouver, ISO, etc.

Más fuentes

Libros sobre el tema "Methacrylic copolymer"

Yang, Chiming. RAFT polymerization and characterization of block copolymers of poly(N-isopropylacrylamide) and poly(methacrylic acid). Ottawa: National Library of Canada, 2003.

Buscar texto completo

Los estilos APA, Harvard, Vancouver, ISO, etc.

Capítulos de libros sobre el tema "Methacrylic copolymer"

Yano, Shinichi, Kenji Tadano, Takahito Sugiura y Eisaku Hirasawa. "Structure and Molecular Motion in Complex Salts of Ethylene — Methacrylic Acid Copolymer With 1,3-Bis-Aminomethylcyclohexane and/or Zinc(II)". En Structure and Properties of Ionomers, 481–92. Dordrecht: Springer Netherlands, 1987. http://dx.doi.org/10.1007/978-94-009-3829-8_42.

Texto completo

Los estilos APA, Harvard, Vancouver, ISO, etc.

Bai, Fenglian, Chia-Hu Chang y S. E. Webber. "Alternating Copolymers of 2-Vinylnaphthalene and Methacrylic Acid in Aqueous Solution". En ACS Symposium Series, 384–411. Washington, DC: American Chemical Society, 1987. http://dx.doi.org/10.1021/bk-1987-0358.ch029.

Texto completo

Los estilos APA, Harvard, Vancouver, ISO, etc.

Bugner, Douglas E. "AB Block Copolymers Containing Methacrylic Acid and/or Metal Methacrylate Blocks". En ACS Symposium Series, 276–90. Washington, DC: American Chemical Society, 1988. http://dx.doi.org/10.1021/bk-1988-0364.ch020.

Texto completo

Los estilos APA, Harvard, Vancouver, ISO, etc.

McNeil, I. C. "Degradation of Polymers of Methacrylic Acid Salts and Copolymers of these Salts with Methyl Methacrylate". En Developments in Polymer Degradation—7, 1–33. Dordrecht: Springer Netherlands, 1987. http://dx.doi.org/10.1007/978-94-009-3425-2_1.

Texto completo

Los estilos APA, Harvard, Vancouver, ISO, etc.

Hallden-Abberton, Michael P. "The Preparation of Methyl Methacrylate/Methacrylic Anhydride Copolymers from PMMA and Dialkyl Amines via Reactive Extrusion". En Polymer Modification, 3–9. Boston, MA: Springer US, 1997. http://dx.doi.org/10.1007/978-1-4899-1477-4_1.

Texto completo

Los estilos APA, Harvard, Vancouver, ISO, etc.

Vuković, Radivoje, Ana Erceg Kuzmić, Grozdana Bogdanić y Dragutin Fleš. "Preparation of Molecularly Imprinted Cross-Linked Copolymers by Thermal Degradation of Poly(methacryl-N,N'-diisopropylurea-co-ethylene glycol dimethacrylate)". En ACS Symposium Series, 229–37. Washington, DC: American Chemical Society, 2005. http://dx.doi.org/10.1021/bk-2005-0916.ch017.

Texto completo

Los estilos APA, Harvard, Vancouver, ISO, etc.

Morris, Barry, John Pennias y David Walsh. "Ethylene Acid Copolymer Metal Salts (Ionomers)". En Polymer Data Handbook, 152–54. Oxford University PressNew York, NY, 2009. http://dx.doi.org/10.1093/oso/9780195181012.003.0025.

Texto completo

Resumen

Abstract General Information Surlyn® (Surlyn® is a registered trademark of the DuPont Company and Surlyn® ionomers are only available from DuPont.) ionomers consist of copolymers of ethylene and methacrylic acid, partially neutralized by a variety of metals such as sodium, zinc, and less commonly, lithium and magnesium. Other manufacturers make ionomers based on acrylic acid copolymers. The neutralization leads to a complex morphology where the ionic groups form clusters. The clusters disrupt the natural spherulitic structure of the polyethylene segments and result in high clarity and improved toughness.

Los estilos APA, Harvard, Vancouver, ISO, etc.

Karimov, M. U., A. T. Djalilov y N. A. Samigov. "A Note on the Influence of Copolymer of Na-Methacrylic Acid and Methacrylic Acid Isobutyl Ester on the Physicmechanical Properties of Cement Systems". En Analytical Chemistry from Laboratory to Process Line, 21–25. Apple Academic Press, 2018. http://dx.doi.org/10.1201/9780429454356-4.

Texto completo

Los estilos APA, Harvard, Vancouver, ISO, etc.

"A Note on the Influence of Copolymer of Na-Methacrylic Acid and Methacrylic Acid Isobutyl Ester on the Physic-Mechanical Properties of Cement Systems". En Analytical Chemistry from Laboratory to Process Line, 41–46. Apple Academic Press, 2016. http://dx.doi.org/10.1201/b19596-11.

Texto completo

Los estilos APA, Harvard, Vancouver, ISO, etc.

Karimov, M., A. Djalilov y N. Samigov. "A Note on the Influence of Copolymer of NA-Methacrylic Acid and Methacrylic Acid Isobutyl Ester on the Physic-Mechanical Properties of Cement Systems". En Analytical Chemistry from Laboratory to Process Line, 21–25. Apple Academic Press, 2015. http://dx.doi.org/10.1201/b19596-6.

Texto completo

Los estilos APA, Harvard, Vancouver, ISO, etc.

Actas de conferencias sobre el tema "Methacrylic copolymer"

Wu, Qinglin, Peng Tian y Quang Cao. "Poly(N-Isopropylacrylamide-Co-Methacrylic Acid) Micro/Nanoparticles: Formulation, Size Distribution and Use for Cu++ Adsorption". En 2008 Second International Conference on Integration and Commercialization of Micro and Nanosystems. ASMEDC, 2008. http://dx.doi.org/10.1115/micronano2008-70019.

Texto completo

Resumen

Poly(N-isopropylacrylamide-co-methacrylic Acid (PNIPAAm-MAA) micro/nano-particles were formulated. The effect of monomer ratio, surfactant, and crosslinker contents on size/size distribution, phase transition behavior, and Cu2+ adsorption efficiency of the particles was investigated. The ionized MAA groups brought both temperature and pH sensitiveness to the PNIPAAm-MAA copolymer particles. As monomer ratio and crosslinker content increased and the amount of surfactants decreased, the particle size increased. The influence of the crosslinker content on particle size was less significant compared to the effect of monomer ratio and surfactants. When temperature increased, the particles tended to shrink and reduced their size to near or below 100nm. The Weibull distribution was successfully used to describe the diameter distribution of the nano-particles, whereas the lognormal was deemed not adequate for that purpose. The method of moments was used to predict parameters of the Weibull distribution. The Weibull parameters were recovered from diameter mean and variance, both of which were predicted from temperature. The distributions predicted from various temperatures for MAA/NIPAAm ratios of 0.05 and 0.10 showed trends similar to those in the data. Studies on chelation efficiency of the particles with Cu2+ ions showed that the amount of the Cu2+ ions adsorbed varied with temperature. Particle size played a very important role in the adsorption and nanoparticles greatly improved adsorption efficiency, compared with their micro hydrogel counterparts. The amount of adsorption increased with increase of MAA ratio in copolymers, but adsorption efficiency decreased with increased particle size. The high adsorption efficiency of metal ions by PNIPAAm-MAA polymer particles provides an effective technique for recovering metal ions (e.g., Cu2+) from wood treated with metal based preservatives.

Los estilos APA, Harvard, Vancouver, ISO, etc.

Iwashige, Yutaro, Yuko T. Ito, Takahiro Kozawa, Kazuo Sakamoto y Makoto Muramatsu. "Dissolution dynamics of copolymer of poly(4-hydroxystyrene-co-methacrylic acid) in tetraalkylammonium hydroxide aqueous solutions". En Advances in Patterning Materials and Processes XLI, editado por Douglas Guerrero y Gilles R. Amblard. SPIE, 2024. http://dx.doi.org/10.1117/12.3011199.

Texto completo

Los estilos APA, Harvard, Vancouver, ISO, etc.

Brogan, J. A., C. C. Berndt, A. Claudon y C. Coddet. "Mechanical Properties of Spray-Formed Composite Structures". En ITSC 1998, editado por Christian Coddet. ASM International, 1998. http://dx.doi.org/10.31399/asm.cp.itsc1998p1173.

Texto completo

Resumen

Abstract In this study, ethylene methacrylic acid copolymer (EMAA) was used as the matrix to produce EMAA/Al2O3 and EMAA/NiCr composite coatings from dry-blended powder mixtures. This work was conducted to determine processing concerns when using similar sized reinforcement particles of different density in a flame-spray process. This work has utility for applications that require a reduction in mechanical wear and/or to confer upon a polymeric deposit a certain functional property by the introduction of value-added powder. Free-standing coatings were produced to test the mechanical properties of the sprayed deposit. The effects of the filler content on the secant modulus, yield stress, and tensile strength are discussed. The differences in deposition efficiencies among the EMAA, Al2O3, and NiCr are highlighted with respect to particle size and density.

Los estilos APA, Harvard, Vancouver, ISO, etc.

Rusu, Teodora y Oana Marilena Gogan. "Artificial intelligence methods applied in the controlled synthesis of polydimethilsiloxane - poly (methacrylic acid) copolymer networks with imposed properties". En VIII INTERNATIONAL CONFERENCE ON “TIMES OF POLYMERS AND COMPOSITES”: From Aerospace to Nanotechnology. Author(s), 2016. http://dx.doi.org/10.1063/1.4949736.

Texto completo

Los estilos APA, Harvard, Vancouver, ISO, etc.

Sadeghi, Mohammad, Alireza Hamzeh, Alberto D’Amore, Domenico Acierno y Luigi Grassia. "NOVEL CROSSLINKED GRAFT COPOLYMER OF METHACRYLIC ACID AND COLLAGEN AS A PROTEIN-BASED SUPERABSORBENT HYDROGEL WITH SALT AND PH-RESPONSIVENESS PROPERTIES". En IV INTERNATIONAL CONFERENCE TIMES OF POLYMERS (TOP) AND COMPOSITES. AIP, 2008. http://dx.doi.org/10.1063/1.2989060.

Texto completo

Los estilos APA, Harvard, Vancouver, ISO, etc.

Arco, Susan, Mark Neil Tolentino, Caidric Gupit y Eduardo Atayde Jr. "Thermo–Responsive Block Copolymers of Ethylene Glycol Derivatives and Methacrylic Acid". En Annual International Conference on Chemistry, Chemical Engineering and Chemical Process ( CCECP 2016 ). Global Science & Technology Forum ( GSTF ), 2016. http://dx.doi.org/10.5176/2301-3761_ccecp16.9.

Texto completo

Los estilos APA, Harvard, Vancouver, ISO, etc.

Podkoscielna, Beata, Karolina Fila, Marta Goliszek, Mateusz Gargol, Barbara Gawdzik, Małgorzata Gil y Paweł Mergo. "Thermal and optical study of the new methacrylic copolymers useful in POF technology". En 13th Conference on Integrated Optics: Sensors, Sensing Structures and Methods, editado por Przemyslaw Struk y Tadeusz Pustelny. SPIE, 2018. http://dx.doi.org/10.1117/12.2502048.

Texto completo

Los estilos APA, Harvard, Vancouver, ISO, etc.

Harthcock, Matthew A. "Structural Analysis Of Ethylene/Acrylic And Methacrylic Acid Copolymers Using Fourier Self-Deconvolution Of Infrared Spectra". En 1985 International Conference on Fourier and Computerized Infrared Spectroscopy, editado por David G. Cameron y Jeannette G. Grasselli. SPIE, 1985. http://dx.doi.org/10.1117/12.970791.

Texto completo

Los estilos APA, Harvard, Vancouver, ISO, etc.

Mukhtarov, Anvar, Maksim Smirnov, Marina Balakina y Tatyana Vakhonina. "The study of dipolar relaxation in chromophore-containing methacrylic copolymers using thermally stimulated depolarization current measurements". En PROCEEDINGS OF THE XV INTERNATIONAL CONFERENCE «PHYSICS OF DIELECTRICS». AIP Publishing, 2020. http://dx.doi.org/10.1063/5.0033790.

Texto completo

Los estilos APA, Harvard, Vancouver, ISO, etc.

Ofrecemos descuentos en todos los planes premium para autores cuyas obras están incluidas en selecciones literarias temáticas. ¡Contáctenos para obtener un código promocional único!