Gotowe bibliografie tematyczne / Vinyle Acetate

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Gotowa bibliografia na temat „Vinyle Acetate”

Autor: Grafiati

Data publikacji: 6 września 2023

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Artykuły w czasopismach na temat "Vinyle Acetate"

Grenier-Loustalot, M. F., M. Audenaert, J. Boutillier i D. Lecacheux. "Etude structurale (sequence, tacticite, branchement alkyl) de copo ethylene, acrylate d'hydroxyethyle et acetate de vinyle par RMN 1H et 13C haute resolution dans les liquides". European Polymer Journal 25, nr 4 (1989): 411–18. http://dx.doi.org/10.1016/0014-3057(89)90159-6.

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Филатов, И. Е., В. В. Уварин i Д. Л. Кузнецов. "Исследование относительной реакционной способности паров алкилацетатов по отношению к компонентам плазмы импульсного разряда в воздухе". Письма в журнал технической физики 49, nr 11 (2023): 25. http://dx.doi.org/10.21883/pjtf.2023.11.55534.19540.

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A study was made of the relative reactivity of vapors of a number of acetic acid esters (alkyl acetates) with respect to plasma components of a pulsed corona discharge with a voltage of 100 kV and a duration of 40 ns. On model mixtures based on methyl-, ethyl-, propyl-, isopropyl, isobutyl-, butyl-, and vinyl acetate with a content of 250–500 ppm in air and nitrogen, the relative reactivity parameters were obtained. The reactivity of acetic acid esters increases with an increase in the hydrocarbon substituent. The high reactivity of vinyl acetate is due to the double bond reaction with ozone.

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Jung, Bo Kyoung, Geon Wook Park, Jae-Keun Yu, Hyo Jun Kim, Dong Gun Kim, Minguen Kim i Kyu Hyun. "Study of Compression Set of Ethylene Vinyl Acetate (EVA) Foams". Polymer Korea 44, nr 3 (31.05.2020): 264–69. http://dx.doi.org/10.7317/pk.2020.44.3.264.

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González, Cristina, Jose Ma Resa, Juan Lanz i Jose A. Mtz de Ilarduya. "Excess molar volumes of binary mixtures containing vinyl acetate + alkyl acetates at 298.15 K. Anomalous behavior of methyl acetate + vinyl acetate mixtures". Fluid Phase Equilibria 137, nr 1-2 (listopad 1997): 141–48. http://dx.doi.org/10.1016/s0378-3812(97)00083-6.

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Bui, Nhi Dinh, Ngo Dinh Vu, Thao Thi Minh, Huong Thi Thanh Dam, Regina Romanovna Spiridonova i Semenovich Alexandr Sirotkin. "Effect of Acetate Group Content in Ethylene-Vinyl Acetate Copolymer on Properties of Composite Based on Low Density Polyethylene and Polyamide-6". International Journal of Polymer Science 2016 (2016): 1–8. http://dx.doi.org/10.1155/2016/3149815.

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The effect of the content of vinyl acetate groups in ethylene-vinyl acetate copolymer on the properties of polymer composite based on low density polyethylene and polyamide-6 was studied. Ethylene-vinyl acetate copolymer containing less vinyl acetate groups (10–14 wt.%) has a positive compatibility effect on polymer composite than ethylene-vinyl acetate copolymer containing 21–30 wt.% vinyl acetate groups. The polymer composites of LDPE, PA-6, and EVA containing 10–14 wt.% vinyl acetate groups possess the ability of biodegradation. The physical-mechanical properties of sample and molecular mass reduce after 28 days of incubation.

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O'Neill, Mark L., Deborah Newman, Eric J. Beckman i Steve P. Wilkinson. "Solvent-free generation of poly(vinyl acetals) directly from poly(vinyl acetate)". Polymer Engineering & Science 39, nr 5 (maj 1999): 862–71. http://dx.doi.org/10.1002/pen.11475.

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Myshak, Volodymyr, Vita Seminog, Volodymyr Grishchenko i Antonina Barantsova. "Modified composites based on poly(ethylene-vinyl acetate) and crumb rubber". Chemistry & Chemical Technology 11, nr 4 (20.12.2017): 454–58. http://dx.doi.org/10.23939/chcht11.04.454.

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He, Chen, Qin Gao, Changwen Ye, Guotao Yang, Pengfei Zhang, Rongchao Yang, Qing Zhang i Kang Ma. "Development of a Purity Certified Reference Material for Vinyl Acetate". Molecules 28, nr 17 (25.08.2023): 6245. http://dx.doi.org/10.3390/molecules28176245.

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Vinyl acetate is a restricted substance in food products. The quantification of the organic impurities in vinyl acetate is a major problem due to its activity, instability, and volatility. In this paper, while using the mass balance method to determine the purity of vinyl acetate, an improved method was established for the determination of the content of three impurities in vinyl acetate reference material, and the GC-FID peak area normalization for vinyl acetate was calibrated. The three trace organic impurities were identified by gas chromatography tandem high-resolution mass spectrometry to be methyl acetate, ethyl acetate, and vinyl propionate. The content and relative correction factors for the three organic impurities were measured. The purity of vinyl acetate determined by the mass balance method was 99.90% with an expanded uncertainty of 0.30%, and the total content of organic impurities was 0.08% with a relative correction factor of 1.23%. The vinyl acetate reference material has been approved as a national certified reference material in China as GBW (E) 062710.

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Bolt, Hermann. "Vinyl acetate". Toxicology 226, nr 1 (wrzesień 2006): 19. http://dx.doi.org/10.1016/j.tox.2006.05.030.

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Luttrell, William E. "Vinyl acetate". Journal of Chemical Health and Safety 20, nr 6 (listopad 2013): 35–37. http://dx.doi.org/10.1016/j.jchas.2013.10.007.

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Rozprawy doktorskie na temat "Vinyle Acetate"

Glikman, Jean-François. "Oxydation photo-thermique des copolymeres ethylene-acetate de vinyle, ethylene-acrylate d'ethyle, ethylene-acide acrylique". Clermont-Ferrand 2, 1987. http://www.theses.fr/1987CLF21050.

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Irradiation sous vide et dans l'air. La vitesse d'apparition des produits de photooxydation depend du type de copolymere. Cinetique et mecanisme. Mise en evidence de la labilite croissante de l'atome d'hydrogene tertiaire situe en position alpha des groupes substituants quand on passe de l'acetate a l'ethylate et a l'acide. Influence de charges et de stabilisants

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Morel, Aurélie. "Synthèse et comportement auto-associatif des copolymères poly(acetate de vinyle)-b-poly(acide acrylique) et de leurs dérivés hydrolysés". Montpellier 2, 2004. http://www.theses.fr/2004MON20162.

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Dhuiège, Benjamin. "Acylation des nanocelluloses en milieu aqueux par transestérification des esters de vinyle et utilisation comme charge dans le caoutchouc naturel". Thesis, Bordeaux, 2017. http://www.theses.fr/2017BORD0645/document.

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Ce travail de thèse a pour objectif d’élaborer de nouveaux matériaux composites (élastomères, adhésifs) en utilisant les nanocelluloses (NCC et NFC) comme renforts mécaniques biosourcés. Une méthode de fonctionnalisation des nanocelluloses en conditions aqueuses a d’abord été développée, dans le but ultime d’améliorer leur compatibilité avec les matrices polymères. La réaction, basée sur la transestérification des esters de vinyle, a été optimisée à partir de l’acétate de vinyle utilisé comme réactif modèle. Le greffage en conditions basiques s’est avéré efficace, mais a également conduit à la formation de poly(acétate de vinyle) (PVAc) comme produit secondaire. Pour pallier à ce problème, un deuxième protocole en conditions neutres a également été développé, mais des rendements moins bons ont été obtenus dans ce cas. Les nanocelluloses non modifiées et acétylées ont ensuite été dispersés dans une matrice caoutchouc naturel (NR) afin d’étudier l’impact de cette charge sur les performances thermomécaniques du matériau cru ou vulcanisé. Une amélioration des propriétés mécaniques a pu être observée en présence de NCC ou NFC, mais l’acétylation des nanoparticules n’a pas conduit à de meilleures performances. Enfin, une valorisation du PVAc produit lors de l’acétylation des nanocelluloses en conditions aqueuses basiques a été proposée. La dispersion des NCC acétylés dans le PVAc polymérisé in-situ a en effet permis de produire des composites aux propriétés améliorées. L’utilisation ultérieure de ces composites comme charge (mélange-maître) dans des matrices NR ou EVA a été discutée
The objective of this research work consists in the elaboration of novel composite materials (elastomers, adhesives) using nanocelluloses (CNC and NFC) as biobased reinforcing fillers. A method allowing the functionalization of nanocelluloses in aqueous conditions was first developed, with the aim of ultimately improving their compatibility with polymer matrices. The reaction, based on the transesterification of vinyl esters, was optimized with vinyl acetate selected as model reactant. The grafting performed in basic aqueous conditions was efficient, but also led to the formation of poly(vinyl acetate) as a by-product. To limit this problem, a second protocol in neutral aqueous conditions was also developed, but lower yields were obtained in that case. The unmodified and acetylated nanocelluloses were then dispersed in a natural rubber matrix (NR), to study the impact of this filler on the thermomechanical performances of the crude and vulcanized material. An improvement of the mechanical properties was observed in the presence of NCC or NFC, but the acetylation of the nanoparticles did not enhance further the performances. Finally, a valorization of the PVAc produced during the acetylation of the nanocelluloses in basic aqueous conditions was proposed. The dispersion of the acetylated NCC in the PVAc polymerized in-situ indeed led to the production of composites with improved properties. The subsequent utilization of these composites as filler (master batch) in NR or EVA matrices was discussed

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Atanase, Léonard-ionut. "Contribution à l'étude des complexes Poly (vinyle alcool - vinyle acétate) / tensioactifs anioniques : caractéristiques colloïdales des nanogels et extension aux copolymères à blocs". Thesis, Mulhouse, 2010. http://www.theses.fr/2010MULH3728.

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Les copolymères poly (acétate de vinyle-co-alcool vinylique), désignés par PVA, sont des tensioactifs macromoléculaires obtenus par hydrolyse partielle de poly (acétate de vinyle)(PVAc). Si les propriétés tensioactives des PVA ont pu être corrélées aux caractéristiques moléculaires il n'en est par de même en ce qui concerne les associats du type nanogels présents dans les solutions aqueuses. L'objectif de cette thèse était de caractériser les nanogels par des techniques telles que la diffusion dynamique de la lumière, la chromatographie d'exclusion stérique et la viscosimétrie. 9 PVA, de degrés d'hydrolyse de 73 à 88 mole% et de degrés de polymérisation de 650 à 2500 ont été étudiés. Il est apparu que les nanogels présent dans les PVA de DH =73 mole% et formés par interactions hydrophobe-hydrophobe entre séquences acétate ont des tailles entre 20-40 nm, avec des fractions volumiques de l'ordre de 20-30%. La désagrégation des nanogels par formation de complexes avec des tensioactifs anioniques du type SDS et SDBS a ensuite été démontrée. En faisant appel à la technique de fractionnement par « point de trouble » il est apparu que les chaînes les plus riches en acétate et en particulier celles ayant des longueurs des séquences acétate importantes complexent plus de SDS.Des « copolymères modèles » du type copolymères diblocs PVAc-b-PVOH comportant une séquence hydrophobe PVAc et une hydrophile PVOH ont pu être préparés par polymérisation RAFT, suivie par une réaction click. Une étude préliminaire de la micellisation de tels copolymères a permis de montrer la très grande analogie entre micelles de copolymères à blocs PVAc-b-PVOH et les nanogels de PVA examinés précédemment
Poly (vinyl acetate-co-vinyl alcohol) copolymers, designated by PVA, are macromolecular surfactants obtained by partial hydrolysis of poly (vinyl acetate) (PVAc). If the surfactant properties of PVA have been correlated with molecular characteristics it is not the same for the colloidal aggregates in aqueous solutions so-called nanogels. The objective of this thesis was to characterize the nanogels using techniques such as dynamic light scattering, size exclusion chromatography and viscometry.9 PVA with degrees of hydrolysis between 73 and 88 mole% and polymerization degrees of 650 to 2500 were studied. It appeared that the nanogels, formed by hydrophobic-hydrophobic interactions between acetate sequences, are the size in the range of 20 to 40 nm with volume fractions between 20 and 30%. The disaggregation of nanogels by complex formation with anionic surfactants such as SDS and SDBS was further demonstrated. By using the "cloud point" fractionation technique it appeared that SDS is complexed by the sequences with high acetate content and in particular those with significant lengths of acetate sequences.As a model system diblock copolymers PVAc-b-PVOH containing a PVAc hydrophobie sequence and a PVOH hydrophilic sequence were prepared by RAFT polymerization, followed by a click reaction. A preliminary micellization study of these copolymers showed a very strong analogy between PVAc-b-PVOH block copolymer micelles and PVA nanogels discussed above

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Dommanget, Cédric. "Polymérisation radicalaire contrôlée : le défi de l'éthylène". Thesis, Lyon 1, 2013. http://www.theses.fr/2013LYO10216/document.

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Les travaux présentés dans cette thèse portent sur le contrôle de la polymérisation radicalaire de l'éthylène à basse pression (200 bar) et basse température (70 °C) et sur la synthèse de copolymères à blocs contenant au moins un segment de polyéthylène. Quatre techniques de polymérisation, couramment utilisées en ingénierie macromoléculaire, ont été étudiées : NMP, CMRP, RAFT/MADIX et ESCP. Nos études sur le nitroxyde SG1 (NMP) et le bis(acétylacétonate) de cobalt (CMRP) ont montré que ces composés sont inefficaces pour contrôler la polymérisation de l'éthylène. Un comportement inattendu du bis(acétylacétonate) de cobalt a cependant été mis en évidence. Il semblerait que ces complexes de cobalt favorisent les réactions de couplage entre les radicaux propagateurs. En revanche, la première polymérisation radicalaire contrôlée de l'éthylène a été atteinte grâce à l'utilisation de xanthates (RAFT/MADIX). Les polyéthylènes synthétisés possèdent des masses molaires qui augmentent linéairement avec la conversion et des dispersités faibles. Le caractère pseudo-vivant de la réaction a été démontré par la synthèse de copolymères à blocs poly(acétate de vinyle)-b-polyéthylène. L'utilisation de nitrones (ESCP) a également permis l'introduction d'une fonction réactive au centre des chaînes de polyéthylène et la synthèse de copolymères triblocs de type ABA, où les blocs latéraux A sont en polystyrène ou polyacrylate et le bloc central B est en Polyéthylène
The work presented in this thesis displays the controlled radical polymerization of ethylene at low temperature (70 °C) and low pressure (200 bar) and the synthesis of block copolymers featuring polyethylene segments. Four polymerization techniques, commonly used in macromolecular engineering, were studied: NMP, CMRP, RAFT/MADIX and ESCP. Our investigation of the use of SG1 nitroxide (NMP) and cobalt (II) acetylacetonate (CMRP) as controlling agents demonstrated their inability to control the polymerization of ethylene. Nonetheless, an unexpected reaction with cobalt (II) acetylacetonate was observed. The coupling reaction between propagating radicals appeared to be favored by the presence of this compound. On the other hand, the first controlled polymerization of ethylene was successfully achieved by using xanthate (RAFT/MADIX). A linear increase of molecular weight with conversion and low polydispersities were observed for the produced polyethylenes. The reaction was demonstrated to be a pseudo-living polymerization by the synthesis of block copolymers poly(vinyl acetate)-b-polyethylene. In addition, midchain-functionalized polyethylenes and ABA type block copolymers, with polystyrene or polyacrylate as the A block and polyethylene as the B block, were also prepared using nitrone based polymerization technique (ESCP)

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Atanase, Léonard-Ionut. "Contribution à l'étude des complexes Poly (vinyle alcool - vinyle acétate) / tensioactifs anioniques : caractéristiques colloïdales des nanogels et extension aux copolymères à blocs". Phd thesis, Université de Haute Alsace - Mulhouse, 2010. http://tel.archives-ouvertes.fr/tel-00562063.

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Palma, Mauri Sergio Alves. "Polimerização de acetato de vinila em emulsão de modo contínuo em coluna pulsada de pratos perfurados". Universidade de São Paulo, 2002. http://www.teses.usp.br/teses/disponiveis/3/3137/tde-27082013-122010/.

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Processos industriais de polimerização em emulsão são usualmente realizados em reatores tipo tanque agitado em batelada (ou semi-batelada) ou em contínuo (CSTR). Reatores contínuos tem a vantagem de serem comparativamente de menor porte, e propiciarem melhor controle da qualidade do produto pela redução de variações de batelada a batelada. Reatores tipo CSTR podem exibir oscilações periódicas e autosustentadas de conversão, de tamanho e concentração de partículas. Estas oscilações podem ser minimizadas nos reatores tubulares pulsados devido à diminuição da dispersão axial em relação aos reatores do tipo CSTR. Na presente tese, desenvolveu-se um novo tipo de reator tubular, a Coluna Pulsada de Pratos Perfurados, CPPP, para uso no processo de polimerização contínua do acetato de vinila em emulsão. O reator é operado com escoamento pulsado e contém pratos perfurados como dispositivos internos. Inicialmente foram realizados ensaios de distribuição de tempos de residência, em um reator montado em vidro, com o objetivo de caracterizar o escoamento no reator CPPP quanto ao grau de mistura axial. Os dados foram interpretados usando o modelo de escoamento pistonado com dispersão axial. Valores do coeficiente de dispersão axial foram medidos e correlacionados para diferentes condições de freqüência e amplitude de pulsação, vazão, espaçamento entre pratos, e viscosidade do fluido. Verificou-se que o grau de mistura axial pode ser variado em faixas relativamente amplas pela manipulação da freqüência e amplitude de pulsação. Foi também montado um reator em aço inox e encamisado, com as mesmas dimensões, onde foram realizados ensaios de polimerização em emulsão de acetato de vinila, medindo-se a conversão e a distribuição de tamanhos de partículas (DTP), na saída do reator em regime transiente e permanente, e também ao longo do reator em regime permanente. Verificou-se que as condições operacionais (tempo médio de residência e grau de dispersão axial) influenciam várias características do produto, como, a conversão, tamanho médio e concentração de partículas, porém, não influencia, significativamente, a viscosidade da emulsão produzida, para a receita da reação de polimerização e as condições operacionais estudadas. Os resultados experimentais foram interpretados usando um modelo matemático do reator, o qual foi estabelecido com base em um modelo cinético publicado na literatura para o processo de polimerização em emulsão de acetato de vinila em batelada. Tal modelo foi adaptado incluindo-se os termos convectivos e dispersivos nas equações de balanço de massa, e resolvido numericamente. Foram ajustados apenas dois parâmetros neste modelo, para todas as condições operacionais estudadas e os resultados simulados reproduziram adequadamente o comportamento das principais variáveis de processo para a condição de regime permanente. O novo tipo de reator contínuo apresentado neste trabalho mostrou-se ser possível obter altas conversões em tempos médios de residência da ordem ou mesmo inferiores aos do processo em batelada e atingir regime permanente de operação em um a dois tempos médios de residência. O reator é eficiente, robusto, construtivamente simples, de fácil limpeza e manutenção, e mostrou-se promissor para utilização industrial em processo de polimerização em emulsão de acetato de vinila.
Industrial emulsion polymerization processes are usually carried out in stirred tanks operated in batch/semibatch or in continuous mode (CSTR). In comparison to batch processes, continuous reactors present several advantages such as lower volumes and better quality control by reducing batch-to-batch variations. Continuous emulsion polymerization in CSTR may exhibit sustained oscillations in conversion, particle size and particle concentration. Such oscillations may be reduced in pulsed tubular reactors due to less axial mixing. In this thesis a new type of tubular reactor, called Pulsed Sieve Plate Column, PSPC, was developed for the continuous process of vinyl acetate emulsion polymerization. This reactor is operated using oscillatory pulsed flow and uses perforated plates as internals. Residence time distribution runs were carried out in a glass reactor in order to characterize the axial mixing and flow patterns in the PSPC. The data were treated using the axially dispersed plug flow model. Axial dispersion coefficient was measured for different conditions of pulse frequency and amplitude, flow rate, plate spacing and viscosity. It was found that the degree of axial mixing can be varied in wide ranges by manipulating pulsation frequency and/or amplitude. Vinyl acetate continuous emulsion polymerization runs were carried out in a jacketed stainless steel reactor (with the same size of the glass reactor). Monomer conversion and particle size distribution was measured both at the reactor exit in transient state and along the reactor length at steady-state. It was found that average residence time and degree of axial mixing affect process and product quality variables, such as monomer conversion, mean particle size and concentration, but did not affect the viscosity of the emulsion produced, for the recipe and conditions used. A mathematical model for the reactor was developed. The model used, based on a well-known kinetic model previously developed in the literature for batch emulsion polymerization, was adapted to the continuous tubular reactor by adding the dispersion and convective terms to the balance equations. The model was numerically solved. Only two parameters were adjusted in this model and the simulated results showed excellent agreement with the experimental results, for steady state conditions. The proposed tubular reactor allows to reach high monomer conversion with similar or even lower residence time than those in batch processes and reaches steady state operation in just one to two mean residence times. The reactor is efficient, easy-to-built, easy-to-clean, robust and promising for use in industrial continuous emulsion polymerization of vinyl acetate.

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Hashimoto, Patrícia Kazuyo. "Complexos de Mn(II) e Fe(II) coordenados a bases de Schiff Bidentadas derivadas de cicloalquilaminas como mediadores da OMRP de acetato de vinila /". Presidente Prudente, 2018. http://hdl.handle.net/11449/154400.

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Orientador: Beatriz Eleutério Goi
Coorientador: Valdemiro Pereira de Carvalho Júnior
Banca: Pedro Ivo da Silva Maia
Banca: Ana Maria Pires
Resumo: Nas últimas décadas, a polimerização radicalar controlada (CRP) tem se tornado muito importante, pois permite a síntese de macromoléculas de arquiteturas específicas com um controle sobre as propriedades químicas e físicas. Sendo assim, este trabalho apresenta a síntese de novos complexos de Mn(II) e Fe(II) coordenados à ligantes bases de Schiff bidentados, que são resultantes da condensação do salicilaldeído com as seguintes cicloalquilaminas: (1) Ciclopentilamina, (2) Cicloexilamina, (3) Cicloeptilamina e (4) Ciclooctilamina, de forma que estes possam ser utilizados como mediadores da polimerização radicalar mediada por organometálicos. Os ligantes foram caracterizados pelas seguintes técnicas: espectroscopia de ressonância magnética nuclear de hidrogênio (RMN de 1H), espectroscopia de absorção na região do ultravioleta-visível (UV-Vis) e espectroscopia vibracional na região do infravermelho (FTIR). Já os complexos de Mn(II) e Fe(II) foram caracterizados pelas técnicas de FTIR, UV-Vis, voltametria cíclica (VC) e ponto de fusão (p.f.). Os estudos cinéticos de polimerização foram realizados para os complexos de manganês e ferro. O complexo [MnIIbis(N-Salicilideno-Ciclopentilamina)], Mn(L1)2, apresentou um melhor controle na polimerização do acetato de vinila com menores valores de polidispersidade e a curva de massa molecular (Mn) mais próxima aos valores da curva teórica. Já os complexos de ferro mediadores apresentaram um comportamento mais similar, não havendo muita...
Abstract: In the last decades, controlled radical polymerization (CRP) has become very important, since it facilitates the synthesis of macromolecules of specific architectures with excellent control over the chemical and physical properties. Thus, this work presents the synthesis of new Mn(II) and Fe(II) complexes coordinated with the bidentate Schiff bases ligands, which are the result of the condensation of salicylaldehyde with cycloalkylamines: (1) cyclopentylamine, (2) cyclohexylamine, (3) cycloheptylamine and (4) cyclooctylamine, so that they can be used as mediators of radical polymerization mediated by organometallic (OMRP). The ligands synthesized were characterized by proton nuclear magnetic resonance (1H-NMR) spectroscopy, ultraviolet-visible (UV-Vis) absorption spectroscopy and Fourier-transform infrared spectroscopy (FTIR) techniques. The synthesized Mn(II) and Fe(II) complexes were studied by FTIR, UV-Vis, cyclic voltammetry (CV) and melting point (m.p.). Kinetic polymerization studies were performed for the manganese and iron complexes. The [MnIIbis (N-Salicylidene-Cyclopentylamine)], Mn(L1)2, complex showed a better control in the polymerization of vinyl acetate with lower values of polydispersity and the molecular mass curve (Mn) closer to the values of the theoretical curve. However, the iron mediator complexes presented a more similar behavior, not having much difference in the kinetic curves
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Raihane, Mustapha. "Copolymérisation du méthyl cyanure de vinylidène (MVCN) avec l'acétate de vinyle et des styrènes substitués : synthèses, microstructures, propriétés et dégradation thermique". Saint-Etienne, 1993. http://www.theses.fr/1993STET4017.

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Le méthyl cyanure de vinylidène (MVCN) est un nouveau monomère préparé en une seule étape selon la méthode de Knoevenagel à partir de produits commerciaux. Ce monomère n'homopolymérise pas. Sa copolymérisation avec l'acétate de vinyle et des styrènes substitués est effectuée par voie radicalaire. Ces copolymères ont été caractérisés par les méthodes classiques d'analyse (IR, RMN, GPC, DSC, microanalyse. . . ). La microstructure de ces copolymères a été aussi étudiée par RMN #1h et #1#3C pour déterminer la répartition des stéréoséquences dans ces copolymères. Le mécanisme de copolymérisation a été aussi étudié en utilisant le modèle terminal et le modèle pénultième. L'application de la méthode de Fineman-Ross et celle de Kelen-Tudos a permis de déterminer les paramètres d'Alfrey et Price du MVCN. La solubilité de ces copolymères a été étudiée, les paramètres de solubilité de trois copolymères ont été mesurés. L'étude des propriétés diélectriques du P(MVCN-FS) ET P(MVCN-CLS) a montré un phénomène de relaxation au-dessus de TG. Ces propriétés sont en accord avec les propriétés thermiques. L'étude thermique de ces copolymères a mis en évidence les mécanismes de décomposition en température, leur stabilité thermique et certains paramètres cinétiques tels que l'énergie d'activation et la constante de vitesse de réaction ont été calculées. Deux modèles (autocatalytique et dépolymérisation) ont été vérifiés

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Franco, Cilene Meinberg. "Pesquisa experimental sobre a polimerização via radical livre com iniciadores mono e difuncional". [s.n.], 2006. http://repositorio.unicamp.br/jspui/handle/REPOSIP/266156.

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Orientador: Liliane Maria Ferrareso Lona
Dissertação (mestrado) - Universidade Estadual de Campinas. Faculdade de Engenharia Quimica
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Resumo: Iniciadores mono funcionais são largamente utilizados em polimerizações VIa radical livre. Muitas vezes, na busca de maiores produtividades, utilizam-se temperaturas de operação mais elevadas e/ou maiores concentrações iniciais de iniciador, que por conseqüência, geram polímeros com pesos moleculares mais baixos. O uso de iniciadores difuncionais permite o aumento da produtividade sem a redução no peso molecular do produto final, o que pode ser urna característica desejável. A pesquisa com iniciadores difuncionais é atual e de grande interesse industrial. O objetivo deste trabalho é analisar o efeito da funcionalidade do iniciador, no caso mono e difuncional, sobre a polimerização via radical livre, considerando corno caso estudo um polímero linear, o poliestireno, e um ramificado, o poli (acetato de vinila). Para isso, foram feitas, experimentalmente, reações de polimerização em ampolas de vidro (polimerização em massa), com o iniciador mono funcional (Luperox TBEC) e o di funcional (Luperox 531). Foram analisados também o efeito da temperatura de polimerização e a concentração de iniciador. Também neste trabalho é apresentado um estudo estatístico através de um Planejamento Fatorial, a fim de analisar o efeito das variáveis temperatura e concentração de iniciador na polimerização do estireno com iniciador difuncional. Observou-se, tanto para o estireno corno para o acetato de vinila, que quando utilizado o iniciador difuncional é possível obter conversões maiores, sem alterar o peso molecular médio mássico e numérico, sendo que em alguns casos pode se até obter um aumento no peso molecular. O uso de iniciador di funcional é também mais viável economicamente, pois apresenta melhores resultados frente ao monofuncional, mesmo quando utilizado em concentrações ou temperaturas menores do que as utilizadas com o iniciador mono funcional. É importante salientar o caráter inovador desta pesquisa, já que não foram encontrados, em literatura aberta, dados experimentais da polimerização do acetato de vinila (ou outro monômero que produza ramificações de cadeia longa) utilizando iniciadores difuncionais
Abstract: Monofunctional initiators are extensively utilized in free radical polymerization. In order to increase productivity, higher temperature or higher initial initiator concentration are used, therefore polymers with lower molecular weights are obtained. Bifunctional initiators increase the polymerization rate without decreasing the average molecular weight and this can be desirable. They are an important issue to be investigated and are of great interest to industries. The objective of this work is to analyze the effect of the functionality of the initiator, by using mono and bifunctional, in free radical polymerization, for linear polymer (poly styrene) and branched polymer (poly(vinyl acetate)). Polymerizations were experimentally performed in glass ampoules (bulk polymerization) using both mono(Luperox TBEC) and bi- (Luperox 531) functional initiators. The effects of temperature and initiator concentration were also analyzed for various polymerization conditions. This work includes a statistical study using the factorial design to analyze the effect of temperature and initiator concentration in styrene polymerization with bifunctional initiator. It is observed in this study, that high conversions with no effect in the molecular weigh of the dead polymer can be achieved using bifunctional initiators in the polymerization of styrene and vinyl acetate. In many cases, it is possible to obtain higher molecular weights. Bifunctional initiator can also be used to provide reduction costs to initiators. They showed better results than the monofunctional initiator when lower concentration or temperature lower were utilized.
Mestrado
Desenvolvimento de Processos Químicos
Mestre em Engenharia Química

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Książki na temat "Vinyle Acetate"

United States. Agency for Toxic Substances and Disease Registry. Division of Toxicology. Vinyl acetate. Atlanta, GA: Agency for Toxic Substances Disease Registry, Division of Toxicology, Dept. of Health and Human Services, Public Health Service, 1992.

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United States. Agency for Toxic Substances and Disease Registry. Division of Toxicology. Acetato de vinilo. Atlanta, GA]: Agencia para Sustancias Tóxicas y el Registro de Enfermedades, División de la Toxicología, Departamento de Salud y Servicios Humanos de los EE.UU., Servicio de Salud Pública, 1992.

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J, Strauss Robert. Polyvinyl acetate adhesives for double-fan adhesive binding: Report on a review and specification study. [Edina, Minn: Library Binding Institute], 1992.

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Vinyl acetate emulsion polymerization and copolymerization with acrylic monomers. Boca Raton, Fla: CRC Press, 2000.

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Clarke, S. D. The characterization of ethylene-vinyl acetate copolymers. Wolverhampton: University ofWolverhampton, 1993.

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Institute, Library Binding, red. Long-term service life and performance characteristics of the PVA cold emulsion adhesives used for the double fanning process in library binding: Are PUR adhesives a viable alternative? [Rochester, N.Y.]: Library Binding Institute, 1991.

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Khunniteekool, Chonlada. Structure/property relationships of cross-linked polyethylene and ethylene vinyl acetate copolymer foams. Manchester: UMIST, 1995.

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Hayes, Teresa L., Robyn Margulies i Debra A. Celinski. Acetic acid & derivatives. Cleveland: Freedonia Group, 2000.

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Canadian Conservation Institute. Conservation Research Services i Canada Communications Canada, red. 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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Institute, Canadian Conservation, red. Towards a better emulsion adhesive for conservation: A preliminary report on the effect of modifiers on the stability of a vinyl acetate/ethylene (VAE) copolymer emulsion adhesive. Ottawa: Canadian Conservation Institute, 2000.

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Części książek na temat "Vinyle Acetate"

Bährle-Rapp, Marina. "Vinyl Acetate". W Springer Lexikon Kosmetik und Körperpflege, 583. Berlin, Heidelberg: Springer Berlin Heidelberg, 2007. http://dx.doi.org/10.1007/978-3-540-71095-0_11036.

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Gooch, Jan W. "Vinyl Acetate". W Encyclopedic Dictionary of Polymers, 794. New York, NY: Springer New York, 2011. http://dx.doi.org/10.1007/978-1-4419-6247-8_12539.

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Gooch, Jan W. "Vinyl Acetate Plastics". W Encyclopedic Dictionary of Polymers, 794. New York, NY: Springer New York, 2011. http://dx.doi.org/10.1007/978-1-4419-6247-8_12540.

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Gooch, Jan W. "Poly(vinyl acetate co vinyl chloride)". W 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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Steiner, G., i C. Zimmerer. "Poly(vinyl acetate) (PVAC)". W 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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Bashford, David. "Ethylene Vinyl Acetate (EVA)". W Thermoplastics, 164–67. Dordrecht: Springer Netherlands, 1997. http://dx.doi.org/10.1007/978-94-009-1531-2_22.

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Whelan, Tony, i John Goff. "Ethylene Vinyl Acetate Copolymers". W Injection Molding of Thermoplastic Materials - 2, 49–59. Boston, MA: Springer US, 1990. http://dx.doi.org/10.1007/978-1-4757-5502-2_3.

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Wohlfarth, Ch. "Viscosity of vinyl acetate". W Supplement to IV/18, 201. Berlin, Heidelberg: Springer Berlin Heidelberg, 2008. http://dx.doi.org/10.1007/978-3-540-75486-2_93.

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Wohlfarth, Christian. "Viscosity of vinyl acetate". W Viscosity of Pure Organic Liquids and Binary Liquid Mixtures, 101. Berlin, Heidelberg: Springer Berlin Heidelberg, 2017. http://dx.doi.org/10.1007/978-3-662-49218-5_88.

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Gooch, Jan W. "Ethylene–Vinyl Acetate Copolymer". W Encyclopedic Dictionary of Polymers, 281. New York, NY: Springer New York, 2011. http://dx.doi.org/10.1007/978-1-4419-6247-8_4601.

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Streszczenia konferencji na temat "Vinyle Acetate"

Desai, Umang, Bhuwanesh Kumar Sharma i Aparna Singh. "Vinyl acetate content tailoring in ethylene vinyl acetate improves the resilience against environmental stressors". W 2022 IEEE 49th Photovoltaics Specialists Conference (PVSC). IEEE, 2022. http://dx.doi.org/10.1109/pvsc48317.2022.9938499.

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Izutsu, Tomoyuki, Daisuke Odaka, Marina Komatsu, Yoshimichi Ohki, Maya Mizuno, Yoshiaki Nakamura i Naofumi Chiwata. "Terahertz and far-infrared spectroscopic estimation of vinyl acetate content in ethylene-vinyl acetate copolymer". W 2015 IEEE Conference on Electrical Insulation and Dielectric Phenomena - (CEIDP). IEEE, 2015. http://dx.doi.org/10.1109/ceidp.2015.7351988.

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Shady, Sally F., i Stephen McCarthy. "Effects of Vinyl Acetate Content and Extrusion Temperatures on Ethylene Vinyl Acetate (EVA) Tetracycline HCL Fibers Used for Periodontal Applications". W ASME 2016 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2016. http://dx.doi.org/10.1115/imece2016-66216.

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Periodontal disease is a prevalent disease that effects all types of ages. Mild cases of periodontal disease include infection and gingivitis. Severe cases of periodontal disease include loss of teeth, and the increased likelihood of systemic diseases such as: cancer, osteoporosis and pneumonia. Current treatments of periodontal disease include systemic approaches such as oral tablets of antibiotics or localized treatments such as the periodontal chip. Oral antibiotics require high dosages to effectively treat the infection therefore causing unwanted side effects. Other treatments include surgery, scaling and rooting. These methods have disadvantages as they are more invasive and require long term maintenance. The aim of this study was to develop a periodontal fiber containing Tetracycline HCl and ethylene vinyl acetate (EVA) that can be implanted in the periodontal pocket and demonstrate a drug release for up to 10 days. To develop this drug-embedded fiber, ethylene vinyl acetate and tetracycline HCL were combined and subsequently formed into a fiber. First, both materials were melted and mixed for several minutes in a Brabender mixer. The resulting material was then pelletized and the fiber was synthesized using the hot melt extrusion process. To produce the most optimal fiber, various vinyl acetate contents were mixed and extruded at high and low processing temperatures. The fiber uniformity, tensile strength, and drug release was tested on three groups: 40% vinyl acetate with low processing temperatures, 40% vinyl acetate with high processing temperatures and 7% vinyl acetate with low processing temperatures. To test the uniformity of the fiber, an inline IR reader was used to monitor the outer diameter of the fiber. Since a 0.5mm would be easily implanted into the periodontal pocket, this was the desired fiber dimension. The Instron was used to analyze the tensile strength of each group to ensure that the fiber was durable enough to withstand the harsh environment of the oral cavity. For the drug release testing the fibers were placed into H2O and incubated to 37°C. Samples from the release media were taken at various time intervals for a total of 10 days. The samples were tested on the UV spectrophotometer for peak absorbances at 360nm. The IR reader testing showed that the Elvax 40W (40% vinyl acetate content) material was easier to extrude than the Innospec (7% vinyl acetate content). The tensile strength tests of the fibers were approximately 0.025 ± 0.05 MPa. In-vitro drug release studies indicated that the low processing temperatures fibers released approximately three times the amount of tetracycline HCl than the high processing temperature group. This indicated that the fibers with low processing temperatures had the most favorable drug release profiles for bacterial inhibition. The overall feasibility for the periodontal fiber application was demonstrated in the 40% vinyl acetate group at lower processing temperatures and has shown the potential for multiple antimicrobial applications.

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Kolesniková, Lucie, Isabelle Kleiner, Jose Cernicharo, José Alonso i Isabel Peña. "THE MILLIMETER-WAVE SPECTRUM OF VINYL ACETATE". W 69th International Symposium on Molecular Spectroscopy. Urbana, Illinois: University of Illinois at Urbana-Champaign, 2014. http://dx.doi.org/10.15278/isms.2014.rj05.

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Agroui, K., i N. Benrekaa. "Characterisation of etylene vinyl acetate for photovoltaic application". W Proceedings of International Conference on Microelectronics (ICM'99). IEEE, 2000. http://dx.doi.org/10.1109/icm.2000.884856.

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Kempe, Michael D., Gary J. Jorgensen, Kent M. Terwilliger, Tom J. McMahon, Cheryl E. Kennedy i Theodore T. Borek. "Ethylene-Vinyl Acetate Potential Problems for Photovoltaic Packaging". W Conference Record of the 2006 IEEE 4th World Conference on Photovoltaic Energy Conversion. IEEE, 2006. http://dx.doi.org/10.1109/wcpec.2006.279933.

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Liu, Chengcen, Tao Dou, Feng Qiu, Jiangao Yang i Kai Shi. "Study on the Stability of Poly(Vinyl Alcohol)/Poly(Vinyl Acetate) Electrothermal Membrane". W 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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hu, yingmo. "Preparation and Characterization of Tourmaline Tetradecenylsuccinate- Vinyl Acetate Copolymer". W International Conference on Nanomaterials, Functional and Composite Materials. HKIRIT, 2018. http://dx.doi.org/10.24177/ckconf2017050002.

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Jing, Yang, Zeng Hui i Huang Jiangping. "Vinyl Acetate Polymerization Rate Prediction Based on FOA GNN". W 2014 Ninth International Conference on P2P, Parallel, Grid, Cloud and Internet Computing (3PGCIC). IEEE, 2014. http://dx.doi.org/10.1109/3pgcic.2014.61.

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Toxqui-Lopez, S., A. Olivares-Pérez, V. Santacruz-Vazquez, I. Fuentes-Tapia i J. Ordoñez-Padilla. "UV recording with vinyl acetate and muicle dye film". W SPIE OPTO, redaktorzy Hans I. Bjelkhagen i V. Michael Bove. SPIE, 2015. http://dx.doi.org/10.1117/12.2079712.

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Raporty organizacyjne na temat "Vinyle Acetate"

Richard D. Colberg, Nick A. Collins, Edwin F. Holcombe, Gerald C. Tustin i Joseph R. Zoeller. Alternate fuels and chemicals from synthesis gas: Vinyl acetate monomer. Final report. Office of Scientific and Technical Information (OSTI), styczeń 1999. http://dx.doi.org/10.2172/750388.

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Meier, Rico. Ultrasonic Characterization of Ethylene Vinyl Acetate (EVA) Crosslinking for Quality Assurance and Lamination Process Control (US-Xlink). Office of Scientific and Technical Information (OSTI), listopad 2021. http://dx.doi.org/10.2172/1969746.

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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), styczeń 1989. http://dx.doi.org/10.2172/6182255.

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