Готові списки джерел за темами / POLY VINYAL ACETATE

Добірка наукової літератури з теми "POLY VINYAL ACETATE"

Автор: Grafiati
Опубліковано: 11 вересня 2023

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Статті в журналах з теми "POLY VINYAL ACETATE"

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Nurlela, Nurlela, and Risnawati Risnawati. "PENGARUH RESIN TERHADAP PERUBAHAN WARNA PADA CAT TEMBOK." JURNAL SAINS NATURAL 5, no. 2 (December 16, 2019): 132. http://dx.doi.org/10.31938/jsn.v5i2.264.

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The Influence of Resin against the Change of Color on the Wall PaintThe quality of the paint is determined by the resin used. Synthetic resins for polymer paints are made by combining several monomers to achieve various characteristics. The incorporation of some monomers such as polyvinyl acetate resin, acrylic vinyl resin and acrylic styrene resin which act as a binder can affect the quality of the paint especially the color change. The purpose of this study is to find the color changes that occur on the wall paint by using Poly Styrene Acrylic , Poly Vinyl Acetate and Poly Vinyl Acrylic. From the results of the measurement of color difference, significant color change occurs in the Poly Vinyl Acetate (PVAc) + Poly Vinyl Acrylic (PVA) and Poly Styrene Acrylic (PSA). The results of the quality test of the three resins based on pH test, scrub test and viscosity test, PSA has better quality compared to PVA + PVAc and PVA resin. From the color difference measurement test, some things need to be considered, are temperature, film thickness, substrate color/background color and measurement conditions (measured in wet sample/in plate/dry surface) and test on resin added additive according to the type of each resin.Keywords: Paint, Resin, Color Changes, Poly Vinyl Acetate, Poly Styrene.ABSTRAK Kualitas dari cat sangat ditentukan oleh resin yang digunakan. Resin sintetis untuk cat berupa polimer yang dibuat dengan menggabung beberapa monomer untuk mencapai berbagai karakteristik. Penggabungan dari beberapa monomer seperti resin poli vinil asetat, resin vinil akrilik dan resin stirena akrilik yang berfungsi sebagai pengikat mampu mempengaruhi kualitas cat terutama dari perubahan warna. Tujuan dari penelitian ini adalah untuk mengetahui perubahan warna yang terjadi pada cat tembok dengan menggunakan Poli Stirena Akrilik, Poli Vinil asetat dan Poli Vinil Akrilik. Dari hasil pengukuran perbedaan warna, perubahan warna cukup signifikan terjadi pada resin Poli vinil Asetat (PVAc) + Poli Vinil Akrilik (PVA) dan resin Poli Stirena Akrilik (PSA). Hasil uji Kualitas cat dari ketiga resin berdasarkan uji pH, uji scrub dan uji viscositas, PSA memiliki kualitas yang lebih baik dibandingkan dengan resin PVA+PVAc dan PVA. Dari pengujian pengukuran perbedaan warna, beberapa hal yang perlu di perhatikan, yaitu suhu, film thickness, warna substrat/background color dan kondisi pengukuran (diukur dalam keadaan wet sample/dalam bentuk plate/dry surface) dan pengujian terhadap resin yang ditambahkan zat aditif yang sesuai dengan tipe masing-masing resin tersebut.Kata Kunci: Cat, Resin, Perubahan Warna, Poli Vinil, Poli Stirena.
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Myshak, Volodymyr, Vita Seminog, Volodymyr Grishchenko, and Antonina Barantsova. "Modified composites based on poly(ethylene-vinyl acetate) and crumb rubber." Chemistry & Chemical Technology 11, no. 4 (December 20, 2017): 454–58. http://dx.doi.org/10.23939/chcht11.04.454.

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O'Neill, Mark L., Deborah Newman, Eric J. Beckman, and Steve P. Wilkinson. "Solvent-free generation of poly(vinyl acetals) directly from poly(vinyl acetate)." Polymer Engineering & Science 39, no. 5 (May 1999): 862–71. http://dx.doi.org/10.1002/pen.11475.

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Waly, A., F. A. Abdel-Mohdy, and A. Hebeish. "Chemical Modification of Starch-Poly (Vinyl Acetate) Materials." Engineering Plastics 6, no. 3 (January 1998): 147823919800600. http://dx.doi.org/10.1177/147823919800600306.

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Анотація:
Starch-poly (vinyl acetate) materials were prepared through polymerization of vinyl acetate with starch using a ferrous ammonium sulphate-hydrogen peroxide redox system. Carboxymethylation through reaction with monochloroacetic acid in presence of alkali and graft polymerization with acrylamide and acrylonitrile of a material having 23% graft and 43% homopolymer were studied. Carboxymethylation occurs during the saponification process of starch-poly (vinyl acetate) in the alkaline medium of sodium monochloroacetate through reaction of the latter with the hydroxyl groups of starch and PVA. On the other hand, grafting seems to proceed via starch macroradicals which are created through the attack of the decomposition products of the redox system on the starch hydroxyl. Carboxymethylation of starch-poly (vinyl acetate) gives polyblended materials which exhibit 100% solubility at 100°C. The same holds true with starch-poly (vinyl acetate) grafted with acrylamide after saponification. Replacement of acrylamide with acrylonitrile results in polyblended material, the solubility of which never exceeds 20% after saponification.
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Waly, A., F. A. Abdel-Mohdy, and A. Hebeish. "Chemical Modification of Starch-Poly (Vinyl Acetate) Materials." Polymers and Polymer Composites 6, no. 3 (March 1998): 161–70. http://dx.doi.org/10.1177/096739119800600306.

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Анотація:
Starch-poly (vinyl acetate) materials were prepared through polymerization of vinyl acetate with starch using a ferrous ammonium sulphate-hydrogen peroxide redox system. Carboxymethylation through reaction with monochloroacetic acid in presence of alkali and graft polymerization with acrylamide and acrylonitrile of a material having 23% graft and 43% homopolymer were studied. Carboxymethylation occurs during the saponification process of starch-poly (vinyl acetate) in the alkaline medium of sodium monochloroacetate through reaction of the latter with the hydroxyl groups of starch and PVA. On the other hand, grafting seems to proceed via starch macroradicals which are created through the attack of the decomposition products of the redox system on the starch hydroxyl. Carboxymethylation of starch-poly (vinyl acetate) gives polyblended materials which exhibit 100% solubility at 100°C. The same holds true with starch-poly (vinyl acetate) grafted with acrylamide after saponification. Replacement of acrylamide with acrylonitrile results in polyblended material, the solubility of which never exceeds 20% after saponification.
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Liu, Bin, Jiangying Kuang, Leishan Shao, Xinyuan Che, Fei Wang, and Yinghan Wang. "Porous membranes based on poly(ether imide)-graft-poly(vinyl acetate) as a scaffold for cell growth." Journal of Bioactive and Compatible Polymers 33, no. 2 (August 18, 2017): 178–94. http://dx.doi.org/10.1177/0883911517723038.

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Анотація:
A series of poly(ether imide)-graft-poly(vinyl acetate) copolymers with different molecular weights were synthesized successfully and characterized using Fourier transform infrared spectroscopy, ultraviolet–visible spectroscopy, proton nuclear magnetic resonance, gel permeation chromatography, differential scanning calorimeter, thermogravimetric analysis, and X-ray photoelectron spectroscopy analyses. These copolymers were used to fabricate honeycomb-structured porous films using the breath figure templating technique. The surface topology and composition of the highly ordered pattern film were further characterized using a scanning electron microscopy. The results indicated that the poly(ether imide)-graft-poly(vinyl acetate) graft molecular weight ratio influenced the breath figure film surface topology. A model was proposed to elucidate the stabilization process of the poly(ether imide)-graft-poly(vinyl acetate)-aggregated architecture on the water droplet–based templates. In addition, cell viability has been investigated via 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide test, and the cell morphology on the honeycomb-structured poly(ether imide)-graft-poly(vinyl acetate) porous film has been evaluated using a fluorescence microscope. This porous film is shown to be suitable as a matrix for cell growth.
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Jung, Hye Min, Eun Mi Lee, Byung Chul Ji, Sung Ok Sohn, Han Do Ghim, Hyunju Cho, Young A. Han, Jin Hyun Choi, Jae Deuk Yun, and Jeong Hyun Yeum. "Preparation of poly(vinyl acetate)/clay and poly(vinyl acetate)/poly(vinyl alcohol)/clay microspheres." Fibers and Polymers 7, no. 3 (September 2006): 229–34. http://dx.doi.org/10.1007/bf02875677.

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Wang, HeYing, Fang Xu, Kun Cui, Hao Zhang, Jin Huang, QiaoLing Zhao, Tao Jiang, and Zhi Ma. "Synthesis of polymethylene-b-poly(vinyl acetate) block copolymer via visible light induced radical polymerization and its application." RSC Advances 7, no. 67 (2017): 42484–90. http://dx.doi.org/10.1039/c7ra06908a.

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Ha, Chang-Sik, Won-Ki Lee, Tae-Woo Roe, and Won-Jei Cho. "Compatibility of nylon 6 with poly(vinyl alcohol), hydroxylated poly(vinyl acetate) and poly(vinyl acetate)." Polymer Bulletin 31, no. 3 (September 1993): 359–65. http://dx.doi.org/10.1007/bf00692964.

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Muller, Julien, Franck Marchandeau, Bénédicte Prelot, Jerzy Zajac, Jean-Jacques Robin, and Sophie Monge. "Self-organization in water of well-defined amphiphilic poly(vinyl acetate)-b-poly(vinyl alcohol) diblock copolymers." Polymer Chemistry 6, no. 16 (2015): 3063–73. http://dx.doi.org/10.1039/c5py00091b.

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Більше джерел

Дисертації з теми "POLY VINYAL ACETATE"

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Croot, Robert Arthur. "The characterisation and adsorption of vinyl alcohol vinyl acetate copolymers." Thesis, University of Bristol, 1990. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.303767.

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Tongcher, Oychai. "Novel routes to stereoregular poly(vinyl acetate)." Thesis, University of Cambridge, 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.620688.

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Cazotti, Jaime Caetano. "Síntese e caracterização de látices híbridos de poli(acetato de vinila)/montmorilonita - PVAc/MMT para aplicação como adesivos." Universidade de São Paulo, 2011. http://www.teses.usp.br/teses/disponiveis/97/97136/tde-27082013-103950/.

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Анотація:
Este projeto de mestrado teve como objetivo a obtenção de látices híbridos constituídos de poli(acetato de vinila) (PVAc) e argila montmorilonita (MMT). O homopolímero de acetato de vinila foi sintetizado através da técnica de polimerização em emulsão na presença de diferentes tipos de argila, sendo empregada uma argila sódica (Na-MMT) e três argilas modificadas (o-MMT) com diferentes sais quaternários de amônio. Poli(álcool vinílico) (PVOH) foi utilizado como colóide protetor e persulfato de amônio (APS) como iniciador. Foi estudada a melhor condição para incorporação da argila na matriz polimérica, visando a esfoliação desta nanocarga, resultando desta maneira na formação de nanocompósitos com propriedades diferenciadas. A influência da presença das argilas foi avaliada em termos da velocidade de consumo de monômero, a qual foi acompanhada por gravimetria. Os látices foram caracterizados quanto ao diâmetro médio de partícula e polidispersidade pela técnica de espalhamento de luz (LS). O teor de coágulos do látex foi calculado por análise gravimétrica e a viscosidade analisada em um viscosímetro rotacional. Os filmes nanocompósitos foram caracterizados pelas técnicas de análise dinâmico-mecânica (DMA), análise termogravimétrica (TGA) e difração de raios X (DRX). A morfologia das partículas de látex foi avaliada por microscopia eletrônica de transmissão (MET).
The goal of this project was the preparation of hybrids latexes constituted by poly(vinyl acetate) (PVAc) and montmorillonite (MMT) clays. The poly(vinyl acetate) homopolymer was synthesized via emulsion polymerization in the presence of different types of clay, one sodium clay (Na-MMT) and organically modified clays (o-MMT) with different ammonium quaternary salts. Poly(vinyl alcohol) (PVOH) was used as protective colloid and ammonium persulfate (APS) as initiator. It was evaluated the best condition for the incorporation of the clay in the polymeric matrix, looking forward the exfoliation of the nanofiller, resulting in the formation of nanocomposites with new and improved properties. The influence of clay type and loading was evaluated in terms of latex stability and monomer consumption rate. The latexes were characterized in terms of particle size diameter and polydispersity by light scattering (LS) technique. Coagulum content was determined by gravimetric analysis and viscosity was analyzed in a rotational viscometer. Nanocomposite films were characterized by dynamic-mechanical analysis (DMA), thermogravimetric analysis (TGA) and X-ray diffraction (XRD). Latex particles morphology was evaluated by transmission electron microscopy (TEM).
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Oliveira, Mauricio Pinheiro de. "Síntesse de novos estabilizantes poliméricos do tipo poli(álcool vinilico-co-neo decanoato de vinila) para utilização na copolimerização em miniemulsão do acetato de vinila (VAc) com o neo-nonanoato de vinila (VEOVA-9)." Universidade de São Paulo, 2010. http://www.teses.usp.br/teses/disponiveis/97/97133/tde-04102012-120438/.

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Анотація:
Devido à importância industrial e tecnológica dos látices estabilizados com poli(álcool vinílico)/PVA e a dificuldade encontrada na etapa de polimerização em emulsão, na presença de monômeros hidrofóbicos e de PVA\'s com alto grau de hidrólise (>92%), a síntese de novos estabilizantes poliméricos derivados de PVA para utilização em reações de polimerização em emulsão e em miniemulsão se torna muito atraente e desafiadora. O objetivo principal deste trabalho foi sintetizar novos estabilizantes poliméricos do tipo poli(álcool vinílico-co-neodecanoato de vinila)/PVA-VV com alto grau de hidrólise e conseqüentemente com propriedades diferenciadas, para serem utilizados como estabilizantes nas reações de polimerização em emulsão e em miniemulsão do acetato de vinila (VAc) com o neo-nonanoato de vinila (VEOVA-9), visando a obtenção de adesivos com propriedades diferenciadas para colagem de madeiras. Os novos estabilizantes poliméricos foram obtidos em duas etapas: i) copolimerização em solução do VAc com o neo-decanoato de vinila (VEOVA-10); ii) hidrólise alcalina (NaOH/Metanol) do poli(acetato de vinila-coneodecanoato de vinila). As miniemulsões de VAc com VEOVA-9 com diferentes tipos de estabilizantes poliméricos foram preparadas em um homogeneizador de alta pressão do tipo \"Manton Gaulin\". Foi estudado o efeito dos estabilizantes poliméricos (PVA e PVA-VV) na etapa de emulsificação (diâmetro médio das gotas, polidispersão, estabilidade das miniemulsões) e na copolimerização em emulsão e em miniemulsão do VAc com o VEOVA-9, em processo batelada. O efeito do tipo de iniciador (persulfato de amônio/APS e hidroperóxido de tércio butila/TBHP e peróxido benzoato de tércio butila/TBPB, juntamente com o formaldeído sulfoxilato de sódio/SFS) na cinética da polimerização em miniemulsão do VAc com o VEOVA-9 foi estudado em processo semi-contínuo. A distribuição dos estabilizantes poliméricos (PVA e PVA-VV) entre a fase aquosa e a superfície das partículas de polímero (adsorvido/enxertado) foi determinada e correlacionada com a viscosidade e a estabilidade coloidal dos látices. Látices na condição ideal de cópia (1:1) das gotas de monômero para as partículas de polímero foram obtidos via polimerização em miniemulsão, apresentando propriedades diferenciadas, tais como, menores valores de viscosidade, menor concentração de coágulos e maior estabilidade de estocagem, em comparação com os látices obtidos em emulsão.
Due to the technological and industrial importance of latexes stabilized with poly(vinyl alcohol)/PVA and the difficulties related to the emulsion polymerization of hydrophobic monomers and the use of PVA having a high degree of hydrolysis (> 92%), the synthesis of new PVA based polymeric stabilizers for use in emulsion and miniemulsion polymerizations becomes very attractive and challenging. The aim of this work was to synthesize a new class of polymeric stabilizer, poly(vinyl alcohol-co-vinyl neo-decanoate)/PVA-VV, with a high degree of hydrolysis and differentiated properties to be used as stabilizers in the emulsion and miniemulsion copolymerization of vinyl acetate (VAc) with vinyl neo-nonanoate (VEOVA-9), that can be used as adhesive for wood bonding. New PVA based polymeric stabilizers with high degree of hydrolysis (94 - 98%) were synthesized in two steps: i) solution copolymerization of vinyl acetate (VAc) with vinyl neo-decanoate (VEOVA-10) and ii) alkaline hydrolysis (NaOH/Methanol) of poly(vinyl acetate-co-vinyl neodecanoate). Miniemulsions of VAc/VEOVA-9 were prepared using the different polymeric stabilizers in a \"Manton Gaulin\" high pressure homogenizer. The effect of different initiators (ammonium persulfate/APS or tert-butyl hydro peroxide/TBHP and tert-butyl peroxide benzoate/TBPB in the presence of sodium formaldehyde sulfoxylate/SFS) in the polymerization kinetic was evaluated. The effect of the type and concentration of polymeric stabilizer, in the emulsification step (average diameter of drops, stability of miniemulsions) as well in the polymerizations (rate of consumption of monomers, particle size and particles number) was investigated in this work. The partition of the polymeric stabilizers between the aqueous phase and the polymer particle surface (grafted/adsorbed) was determined and correlated with the viscosity and colloidal stability of latexes. Latexes with differentiated properties such as low-viscosity, lower grits content and improved storage stability, were obtained by miniemulsion polymerization with an ideal condition copy (1:1) of the monomer droplets to the polymer particles.
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Oghide, Godwin O. "Miscibility studies of poly (methyl acrylate) poly (vinyl acetate) and poly (vinyl acetate)/ poly (vinylidene fluoride) blends using differential scanning calorimetry and fourier transform infra red spectroscopy." DigitalCommons@Robert W. Woodruff Library, Atlanta University Center, 1985. http://digitalcommons.auctr.edu/dissertations/3294.

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Анотація:
The miscibility of poly (methyl acrylate)/poly (vinyl acetate) (PMA/PVAc) and poly (vinyl acetate)/poly(vinylidene fluoride) (PVAc/PVF2) blends has been studied. Films of compositions 100/0, 80/20, 60/40, 50/50, 40/60, 20/80, and 0/100 (w/w) were cast for each system. Films of PMA/PVAc were found transparent and those of the PVAc/PVf2 were slightly opaque. While all the compositions of the PMA/PVAc exhibit single sharp Tgs, as measured with the differential scanning calorimeter, almost all of those of the PVAc/PVF2 exhibit s1 ng1 e broad TgS. By the single Tg criterion, the PVA/PVAc and PVAc/PVF2 systems are miscible in all proportions. Fourier transform infra-red spectroscopy spectra indicate molecular interaction complex involvement in the two systems. Evidence for such interaction was found to be significant in the 80% PMA/20% PVAc and 20% PVAc/80% PVF2 compositions.
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Cauich-Rodriguez, Juan Valerio. "Hydrogels based on poly(vinyl alcohol-vinyl acetate) blends for biomedical applications." Thesis, Queen Mary, University of London, 1997. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.267577.

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Khan, Shadeed. "Controlled Release of Fluoride from Poly(ethylene-co-vinyl acetate) Films." VCU Scholars Compass, 2009. http://scholarscompass.vcu.edu/etd/1928.

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Анотація:
The development of aesthetically unattractive white spots is a concern for patients undergoing fixed orthodontic treatment. Due to poor oral hygiene during treatment, accumulation of plaque around orthodontic brackets causes bacterial fermentation reactions producing acids that dissolve the mineral enamel. Such dissolution results in white spot formation, an early sign of dental caries. In principal, to inhibit the appearance of these spots during treatment, fluoridated elastomeric o-rings might be employed. Once placed around brackets, these o-rings should release fluoride therapeutically for at least 30 days, after which the orthodontist may replace them. At the present time, such fluoride-releasing o-rings are not available. In this study, model materials for fluoride-releasing elastomeric o-rings were developed. These materials were fluoride-impregnated poly(ethylene-co-vinyl acetate) (PEVA) films. In vitro release studies of these films were conducted, assessing their capacity to deliver fluoride within therapeutic range (1.2 ≤ µg F/ring/day ≤ 51.4) for 30-45 days. Optimal sample and experimental parameters, including (1) fluoride loading in the film (wt% F), (2) overcoat thickness, and (3) temperature that provided therapeutic release, were determined. At 37°C, favorable release was observed for the following: (1) films with overcoat thickness of 0.14 mm and fluoride loadings of 3.9 wt% and 5.7 wt% and (2) films with overcoat thickness of 0.27 mm and fluoride loading of 5.7 wt%. These results are important in providing fundamental guidance for the development of o-rings that combat white spot formation among orthodontic patients.
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Yao, Hongyang. "Microstructures of poly(vinyl acetate) studied by nuclear magnetic resonance spectroscopy." W&M ScholarWorks, 1997. https://scholarworks.wm.edu/etd/1539623911.

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Анотація:
Carbon-13 NMR spectroscopy was used to investigate the microstructures of poly(vinyl acetate) prepared by solution polymerization in benzene. A series of aromatic compounds was synthesized in order to model the structures formed via chain transfer to solvent. The peaks near 126.5 and 128.5 ppm in the spectra of the polymer samples were assigned to a 1-phenyl-(2n + 1)-multi-acetoxyalkane (where n = 1, 2, 3, etc.) microstructure. The concentration of that structure obtained from NMR spectra was correlated with the concentration calculated from reported kinetic data.;Chain transfer to benzene was shown to occur by addition of the macroradical to benzene, followed by rearomatization involving loss of a hydrogen atom. No evidence was obtained for a transfer mechanism involving hydrogen abstraction from benzene, and the copolymerization of benzene with vinyl acetate also was shown to be absent. The transfer mechanism actually established accounts for the unexpectedly large transfer constant of benzene in vinyl acetate polymerization. General mechanisms are proposed for the solution polymerization of vinyl acetate in aromatic solvents.
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Lange, Hanna. "Emulsion polymerization of vinyl acetate with renewable raw materials as protective colloids." Thesis, KTH, Skolan för kemivetenskap (CHE), 2011. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-41019.

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Анотація:
Emulsion polymerizations of vinyl acetate (VAc) were performed by fully or partially replacing poly(vinyl alcohol) (PVA) with renewable materials as protective colloids or by adding renewable materials, as additives or fillers, to the emulsions during or after polymerization. The purpose of the study was to increase the amount of renewable materials in the emulsion. A total of 19 emulsions were synthesized. Different recipes were used for the synthesis. The following renewable materials were studied; hydroxyethyl cellulose (HEC) with different molecular weights, starch and proteins. HEC and starch were used as protective colloids. Proteins were used as additives or fillers. Cross-linking agent A and Cross-linking agent B were used as cross-linking agents. A total of 26 formulations were pressed, either cold or hot. The synthesized emulsions were evaluated with respect to pH, solids content, viscosity, minimum film formation temperature (MFFT), glass transition temperature (Tg), particle size and molecular weight (Mw). The tensile shear strengths of the emulsions were evaluated according to EN 204 and WATT 91. It was possible to fully, or partially, replace PVA as protective colloid with renewable materials. It was also possible to use renewable materials as additives or fillers in the emulsions. The emulsions obtained properties that differed from the reference. Generally, emulsions with HEC as protective colloid showed lower viscosity and slightly higher MFFT, Tg and molecular weight than emulsions with PVA as protective colloid. Larger particle sizes than the reference were obtained for emulsions containing PVA combined with renewable materials. The emulsion with starch as protective colloid exhibited the largest particle size. 10 formulations passed the criteria for D2. The emulsions where PVA was fully or partially replaced with HEC or starch showed a water resistance similar to the reference (around D2). The addition of protein did not decrease the water and heat resistance compared to the reference. Addition of protein after polymerization increased the water resistance (D2) compared to addition during polymerization. Addition of cross-linking agents did not increase the water resistance further. Two formulations passed the criteria for D3. The emulsion in the first formulation had PVA as protective colloid and protein B was added during polymerization. The emulsion in the second formulation had HEC as protective colloid. To both of these emulsions, protein A was added after polymerization, as a filler, combined with Cross-linking agent B as cross-linking agent before hot pressing. The first formulation also showed a good heat resistance (passed the criteria for WATT 91).
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Brown, Nicole Robitaille. "Understanding the Role of N-Methylolacrylamide (Nma) Distribution in Poly(Vinyl Acetate) Latex Adhesives." Diss., Virginia Tech, 2003. http://hdl.handle.net/10919/26446.

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This work addresses the distribution of N-methylolacrylamide (NMA) units in crosslinking poly(vinyl acetate) (PVAc) adhesives. In this case, distribution refers to the three potential locations of polymerized NMA units in a latex: the water-phase, the surface of polymer particles, and the core of the polymer particles. The objective is to identify the distribution of NMA in three latices and to determine whether NMA distribution correlates with durability related performance. NMA distribution was studied via a series of variable temperature solution NMR experiments, while the durability-related performance was studied via mode I fracture mechanics tests. Studying the distribution of NMA required the use of isotopically labeled NMA. Both 15N-NMA and 13C, 15N-NMA were synthesized. Three NMA/vinyl acetate (VAc) latices were prepared. The NMA feed strategy was varied during each of the three emulsion copolymerizations. Latex characterization methods including differential scanning calorimetry (DSC), rheometry, particle size analysis, and scanning electron microscopy (SEM) were used to study the three latices. The solution NMR method to identify NMA distribution was performed on untreated latices and on washed latices. Washing techniques included membrane dialysis and centrifugation. Results revealed that the three latices had different NMA distributions, and that the distributions were related to the expected differences in microstructure. Latex 3 had ~ 80% core-NMA, while Latex 2 had ~ 80% surface-NMA. Latex 1 had a high proportion of surface-NMA (~60%), but also had the highest proportion of water-phase NMA (~ 20%). This high proportion of water-phase NMA could be responsible for the unique morphology Latex 1 exhibited in SEM studies. Mode I opening fracture mechanics studies were used to study adhesive performance. Specimens were analyzed after exposure to accelerated aging treatments. Latex 2 and Latex 3 exhibited very similar results, despite having very different NMA distributions. All three latices showed good durability related performance. In Latex 2 and Latex 3, the critical strain energy release rates (Gc) after accelerated aging treatments were statistically the same as the Gc of the control specimens. The most interesting finding was that the Latex 1 Gc values were significantly higher after accelerated aging. Latex 1 also had the highest proportion of water-phase NMA. Bondline images and SEM micrographs both indicated that the integrity of Latex 1 was least affected by the accelerated aging treatments.
Ph. D.
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Книги з теми "POLY VINYAL ACETATE"

1

Canadian Conservation Institute. Conservation Research Services and Canada Communications Canada, eds. Adhesive testing at the Canadian Conservation Institute: An evaluation of selected poly(vinyl acetate) and acrylic adhesives. Ottawa, Canada: Communications Canada, 1992.

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2

Perry, Katherine Louise. The diffusion of acetone into poly(vinyl chloride). 1994.

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3

Wu, Jun. Synthesis, characterization, and polymer diffusion studies of poly(vinyl acetate) copolymer latexes. 2004.

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4

Oh, Jung Kwon. Synthesis and characterization of dye-labeled poly(vinyl acetate-butyl acrylate) latex particles and their application to film formation and polymer interdiffusion. 2004.

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Частини книг з теми "POLY VINYAL ACETATE"

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Steiner, G., and C. Zimmerer. "Poly(vinyl acetate) (PVAC)." In Polymer Solids and Polymer Melts – Definitions and Physical Properties I, 1020–26. Berlin, Heidelberg: Springer Berlin Heidelberg, 2013. http://dx.doi.org/10.1007/978-3-642-32072-9_116.

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2

Gooch, Jan W. "Poly(vinyl acetate co vinyl chloride)." In Encyclopedic Dictionary of Polymers, 576. New York, NY: Springer New York, 2011. http://dx.doi.org/10.1007/978-1-4419-6247-8_9253.

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3

MOSKALA, E. J., J. P. RUNT, and M. M. COLEMAN. "Poly(vinylphenol) Blends with Poly(vinyl Acetate) and Ethylene-Vinyl Acetate Copolymers." In Advances in Chemistry, 77–85. Washington, DC: American Chemical Society, 1985. http://dx.doi.org/10.1021/ba-1986-0211.ch005.

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4

Gooch, Jan W. "Poly(styrene-co-vinyl acetate)." In Encyclopedic Dictionary of Polymers, 572. New York, NY: Springer New York, 2011. http://dx.doi.org/10.1007/978-1-4419-6247-8_9216.

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5

Saunders, K. J. "Poly(Vinyl Acetate) and Related Polymers." In Organic Polymer Chemistry, 113–24. Dordrecht: Springer Netherlands, 1988. http://dx.doi.org/10.1007/978-94-009-1195-6_5.

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6

Wohlfarth, Ch. "Solubility parameter of poly(vinyl acetate)." In Polymer Solutions, 1668. Berlin, Heidelberg: Springer Berlin Heidelberg, 2010. http://dx.doi.org/10.1007/978-3-642-02890-8_1019.

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7

Wohlfarth, Ch. "Vapor-liquid equilibrium data of poly(vinyl acetate) in vinyl acetate." In Polymer Solutions, 2266–70. Berlin, Heidelberg: Springer Berlin Heidelberg, 2009. http://dx.doi.org/10.1007/978-3-540-88057-8_454.

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8

Wohlfarth, Ch. "Vapor-liquid equilibrium data of poly(vinyl acetate-co-vinyl chloride) in vinyl acetate." In Polymer Solutions, 2341–45. Berlin, Heidelberg: Springer Berlin Heidelberg, 2009. http://dx.doi.org/10.1007/978-3-540-88057-8_469.

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9

Pionteck, J., and M. Pyda. "pVT Data of Poly(vinyl chloride-graft-vinyl acetate)." In Part 2: Thermodynamic Properties – pVT-Data and Thermal Properties, 25. Berlin, Heidelberg: Springer Berlin Heidelberg, 2014. http://dx.doi.org/10.1007/978-3-642-41542-5_6.

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10

Wohlfarth, Ch. "Solubility parameter of poly(vinyl acetate-co-vinyl alcohol)." In Polymer Solutions, 1669. Berlin, Heidelberg: Springer Berlin Heidelberg, 2010. http://dx.doi.org/10.1007/978-3-642-02890-8_1020.

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Тези доповідей конференцій з теми "POLY VINYAL ACETATE"

1

Liu, Chengcen, Tao Dou, Feng Qiu, Jiangao Yang, and Kai Shi. "Study on the Stability of Poly(Vinyl Alcohol)/Poly(Vinyl Acetate) Electrothermal Membrane." In 2010 4th International Conference on Bioinformatics and Biomedical Engineering (iCBBE). IEEE, 2010. http://dx.doi.org/10.1109/icbbe.2010.5516568.

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2

Vasconcelos, Helena, José M. M. M. de Almeida, João Mendes, Bernardo Dias, Pedro A. S. Jorge, Cristina Saraiva, and Luís C. C. Coelho. "Optical Fiber Sensor for the Detection of Decarboxylation Products of Amino Acids." In Optical Fiber Sensors. Washington, D.C.: Optica Publishing Group, 2022. http://dx.doi.org/10.1364/ofs.2022.th4.68.

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Long period fiber gratings coated with TiO2 and poly(ethylene-co-vinyl acetate) (PEVA), a polymeric structure permeable biogenic amines found in foodstuff, were used to detect these compounds through the wavelength shift of its attenuation band.
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3

Seok Lyoo, Won, Jin Wook Cha, Kun Young Kwak, Young Jae Lee, Han Yong Jeon, Yong Sik Chung, Seok Kyun Noh, A. D’Amore, Domenico Acierno, and Luigi Grassia. "Preparation of Syndiotactic Poly(vinyl alcohol)∕Poly(vinyl pivalate∕vinyl acetate) Microspheres with Radiopacity Using Suspension Copolymerization and Saponification." In V INTERNATIONAL CONFERENCE ON TIMES OF POLYMERS (TOP) AND COMPOSITES. AIP, 2010. http://dx.doi.org/10.1063/1.3455646.

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4

Bhagat, D. J., N. S. Bajaj, and G. R. Dhokane. "Electro–optical properties of poly(vinyl acetate)/polyindole composite film." In INTERNATIONAL CONFERENCE ON CONDENSED MATTER AND APPLIED PHYSICS (ICC 2015): Proceeding of International Conference on Condensed Matter and Applied Physics. Author(s), 2016. http://dx.doi.org/10.1063/1.4946222.

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5

Wojcik, Anna B., and Lisa C. Klein. "Transparent poly(vinyl acetate)-silica gels by a sol-gel process." In SPIE's 1993 International Symposium on Optics, Imaging, and Instrumentation, edited by Gary W. Wilkerson. SPIE, 1993. http://dx.doi.org/10.1117/12.165225.

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6

Rajendran, S., Chithra M. Mathew, T. Marimuthu, and K. Kesavan. "Li ion conducting gel polymer electrolytes based on Poly(vinyl acetate)." In PROCEEDING OF INTERNATIONAL CONFERENCE ON RECENT TRENDS IN APPLIED PHYSICS AND MATERIAL SCIENCE: RAM 2013. AIP, 2013. http://dx.doi.org/10.1063/1.4810457.

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7

Yao, Ruigang, Duan-Fu Xu, Qiang Li, Shifu Weng, Yongnian Yang, Zhen-hua Xu, JinGuang Wu, and Guang-Xian Xu. "Study on the hydration of poly(vinyl acetate) by FTIR spectroscopy." In Luebeck - DL tentative, edited by Herbert M. Heise, Ernst H. Korte, and Heinz W. Siesler. SPIE, 1992. http://dx.doi.org/10.1117/12.56456.

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8

Kuo, Kenneth, Ragini Acharya, Eric Boyd, and Stefan Thynell. "Pyrolysis Study of Succinic Acid/Poly-Vinyl Acetate as Ablative Material for Boundary." In 43rd AIAA/ASME/SAE/ASEE Joint Propulsion Conference & Exhibit. Reston, Virigina: American Institute of Aeronautics and Astronautics, 2007. http://dx.doi.org/10.2514/6.2007-5775.

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9

ARUN KUMAR, D., T. SAVITHA, S. SELVASEKARAPANDIAN, and R. BASKARAN. "ELECTRICAL CONDUCTIVITY STUDIES ON PROTON CONDUCTING POLYMER ELECTROLYTES BASED ON POLY (VINYL ACETATE)." In Proceedings of the 10th Asian Conference. WORLD SCIENTIFIC, 2006. http://dx.doi.org/10.1142/9789812773104_0067.

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10

Labardi, M., D. Prevosto, H. K. Nguyen, M. Lucchesi, E. Fanizza, N. Depalo, and M. Striccoli. "Space resolved relaxation dynamics of poly(vinyl acetate) close to interfaces with SiOx nanoinclusions." In 6TH INTERNATIONAL CONFERENCE ON TIMES OF POLYMERS (TOP) AND COMPOSITES. AIP, 2012. http://dx.doi.org/10.1063/1.4738448.

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Звіти організацій з теми "POLY VINYAL ACETATE"

1

Stern, S. A. Mechanisms of gas permeation through polymer membranes: Summary technical report, January 1986--December 1989. [Poly(alkyl methacrylates), poly-(1-trimethylsylil-1-propyne), and poly(vinyl acetate)]. Office of Scientific and Technical Information (OSTI), January 1989. http://dx.doi.org/10.2172/6182255.

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