Synthesis and thermal behaviour of layered silicate–EVA nanocomposites

Zanetti, Marco; Camino, Giovanni; Thomann, Ralf; Mülhaupt, Rolf

doi:10.1016/s0032-3861(00)00775-8

Cited by 456 publications

(285 citation statements)

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“…Upon degradation, the acetate side groups are first eliminated from the polymer backbone in the so-called deacetylation step, leaving an unsaturated polymer backbone or polyene [1,2]. This polyene undergoes allylic chain scission reactions to reach full degradation [5,6].…”

Section: Introductionmentioning

confidence: 99%

The thermal degradation of poly(vinyl acetate) and poly(ethylene-co-vinyl acetate), Part I: Experimental study of the degradation mechanism

Rimez

Rahier

Assche

et al. 2008

Polymer Degradation and Stability

124

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The thermal degradation mechanism of poly(vinyl acetate) (PVAc) and poly(ethylene-co-vinyl acetate) (EVA) copolymers was investigated with solid-state NMR, thermogravimetry coupled with mass spectrometry and differential thermal analysis. Between 300 and 400 C acetic acid is eliminated (deacetylation), leaving a highly unsaturated residue or polyene. The deacetylation of PVAc is autocatalytic. Upon incorporation of ethylene entities into the polymer backbone, autocatalysis disappears. Between 400 and 500 C, the polyene will degrade further by chain scission reactions in inert conditions or aromatise in an oxidative environment into a char, and oxidised eventually into CO 2 beyond 500 C.In inert conditions, the deacetylation step as well as the chain scission reaction shows endothermic effects. In an oxidative environment, large exothermal effects are found for each degradation step. This indicates the occurrence of additional oxidation reactions during deacetylation, an important reorganisation of the polyene during char formation and oxidation of the latter into CO 2 .

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Section: Introductionmentioning

confidence: 99%

The thermal degradation of poly(vinyl acetate) and poly(ethylene-co-vinyl acetate), Part I: Experimental study of the degradation mechanism

Rimez

Rahier

Assche

et al. 2008

Polymer Degradation and Stability

124

View full text Add to dashboard Cite

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“…105 The thermal and flammability behaviors of these systems were studied as well. 106 In comparison to the matrix behavior, the microcomposites did not show improvement of thermal stability. By contrast, PNCs containing FH-C 18 had higher thermal oxidation temperature and lower thermal degradation rate, with high char yield that enhanced the ablative effects.…”

Section: Polyolefin Matrixmentioning

confidence: 90%

“…Zanetti et al 89,90,138 melt compounded (in a minicompounder or internal mixer) EVAc-12 or EVAc-19 with ME-100 pre-intercalated with ODA or ADA. The degree of clay dispersion depended on the matrix and intercalant, namely in EVAc-19 exfoliation was obtained for FM-ODA, whereas d 001 was unchanged for FM-ADA.…”

Section: Poly(ethylene-co-vinyl Acetate) (Evac) Matrixmentioning

confidence: 99%

Synthetic, layered nanoparticles for polymeric nanocomposites (PNCs)

Utracki

Sepehr

Boccaleri

2007

Polymers for Advanced Techs

376

251

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Synthetic, layered nano-particles for polymeric nanocomposites (PNC's)Utracki, L. A.; Sepehr, M.; Boccaleri, E.Contact us / Contactez nous: nparc.cisti@nrc-cnrc.gc.ca.http://nparc.cisti-icist.nrc-cnrc.gc.ca/npsi/jsp/nparc_cp.jsp?lang=fr L'accès à ce site Web et l'utilisation de son contenu sont assujettis aux conditions présentées dans le site Web page / page Web http://dx.doi.org/10.1002/pat.852 http://nparc.cisti-icist.nrc-cnrc.gc.ca/npsi/ctrl?action=rtdoc&an=15774991&lang=en http://nparc.cisti-icist.nrc-cnrc.gc.ca/npsi/ctrl?action=rtdoc&an=15774991&lang=fr LISEZ CES CONDITIONS ATTENTIVEMENT AVANT D'UTILISER CE SITE WEB. READ THESE TERMS AND CONDITIONS CAREFULLY BEFORE USING THIS WEBSITE.Access and use of this website and the material on it are subject to the Terms and Conditions set forth at http://nparc.cisti-icist.nrc-cnrc.gc.ca/npsi/jsp/nparc_cp.jsp?lang=en This review discusses preparation and use of the synthetic layered nanoparticles in polymer matrices, i.e., in the polymeric nanocomposites (PNCs). Several types of synthetic or semi-synthetic layered materials are considered, namely the phyllosilicates (clays), silicic acid (magadiite), layered double hydroxides (LDHs), zirconium phosphates (ZrPs), and di-chalcogenides. The main advantage of synthetic clays is their chemical purity (e.g. absence of amorphous and gritty contaminants, as well as arsenic, iron, and other heavy metals), white to transparent color that assures reproducibly of brightly colored products, as well as a wide range of aspect ratios, p ¼ 20 to £6000. Several large scale production facilities have been established. The synthetic clay and LDH industries are oriented toward big volume markets: catalysis, foodstuff, cosmetics, pharmaceuticals, toiletry, etc. The use of these materials in PNCs is limited to synthetic clays and LDHs, mainly for reinforcement, permeability control, reduction of flammability, and stabilization, e.g. during dehydrohalogenation of chlorinated macromolecules. The use of lamellar ZrPs and di-chalcogenides is at the laboratory stage of functional polymeric systems development, e.g. for electrically conductive materials, catalysts or support for catalysts, in photochemistry, molecular and chiral recognition, or in fuel cell technologies, etc. Copyright # 2007 John Wiley & Sons, Ltd.KEYWORDS: polymeric nanocomposites; nanoparticles; clay; layered double hydroxides; matrix POLYMERS FOR ADVANCED TECHNOLOGIES Polym. Adv. Technol. 2007; 18: 1-37 Published online in Wiley InterScience (www.interscience.wiley.com) DOI: 10.1002/pat.852 AUTHORS' BIOGRAPHIESDr Leszek A. Utracki was born and educated (up to Habilitation) in Poland. After the post-doctoral stage at USC in Los Angeles with Robert Simha he settled in Canada. His passionate research interest has been within the field of thermodynamics, rheology and processing of multicomponent, multiphase polymeric systems. During the 55 years in the profession he has published several hundred articles, book chapters, books, patents, etc., which has placed him on the ISI li...

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“…Os resultados de TGA para as amostras de EVA19 e EVA28 indicam uma primeira redução de massa em 339°C e 334°C, que corresponde à pirólise dos grupos de éster acético do Acetato de Vinila com eliminação do ácido acético [19] . Esta região de perda de massa foi acelerada para os nanocompósitos, como pode ser observado pela redução da temperatura de perda de 5% em massa, o que pode ser atribuído à degradação do modificador orgânico [20] .…”

Section: Estabilidade Térmicaunclassified

“…Esta região de perda de massa foi acelerada para os nanocompósitos, como pode ser observado pela redução da temperatura de perda de 5% em massa, o que pode ser atribuído à degradação do modificador orgânico [20] . Notouse ainda uma segunda região de perda de massa (acima de 400°C), que se refere à degradação do copolímero resultante da desacetilação [19] .…”

Section: Estabilidade Térmicaunclassified

Influência das condições de mistura e dos teores de Acetato de Vinila e de argila nas propriedades de nanocompósitos de EVA/montmorilonita organofílica

et al. 2014

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Resumo: O copolímero Etileno Acetato de Vinila (EVA) é uma poliolefina utilizada principalmente em filmes para embalagens, onde a sua flexibilidade, tenacidade, elasticidade e transparência são atributos desejáveis. As propriedades mecânicas, térmicas e de barreira do EVA podem ser melhoradas pela incorporação de cargas inorgânicas. O EVA apresenta polaridade variável de acordo com o teor de Acetato de Vinila, o que promove a viabilidade para obtenção de nanocompósitos com argilas organicamente modificadas, tornando desnecessária a adição de agentes compatibilizantes. Neste trabalho foram preparados nanocompósitos de EVA e montmorilonita organofílica comercial pelo método de intercalação do fundido em um reômetro de torque, com rotores tipo roller, a 150°C durante 10minutos, com monitoramento do torque em função do tempo. A fim de investigar a influência da polaridade do EVA, da concentração da argila e das condições de processamento nas características dos nanocompósitos, variou-se a concentração de Acetato de Vinila (19% e 28%), o teor de argila (2% e 5%) e a velocidade de rotores (60 rpm e 100 rpm). Foram avaliadas a estrutura da argila, a estabilidade térmica e as propriedades mecânicas e de barreira dos nanocompósitos, mediante as técnicas de difração de raios X, análise termogravimétrica, ensaio de tração e análises de taxa de permeabilidade ao oxigênio e ao vapor d'água. A partir dos dados de permeabilidade foi aplicado o modelo de Nielsen para avaliar o grau de esfoliação da argila. Dentre os principais resultados com o planejamento fatorial destacam-se: (a) o aumento da polaridade do EVA aumentou a permeabilidade ao oxigênio e ao vapor d'água dos materiais; (b) o teor de argila não modificou a estabilidade térmica dos nanocompósitos e a estrutura da argila; (c) o aumento da concentração da argila aumentou o módulo elástico, reduziu a deformação de ruptura e reduziu significativamente o coeficiente de permeabilidade ao oxigênio e ao vapor d'água; (d) o fator rotação não implicou em alterações significativas em nenhuma das respostas avaliadas. Palavras-chave: Nanocompósitos, EVA, permeabilidade, montmorilonita organofílica. Influence of Processing and Content of Vinyl Acetate on the Properties of Eva/ Organophilic Montmorillonite NanocompositesAbstract: The copolymer Ethylene Vinyl Acetate (EVA) is a polyolefin used mainly in packaging films, where its flexibility, toughness, elasticity and transparency are desirable attributes. The mechanical, thermal and barrier properties of EVA can be improved by the incorporation of inorganic fillers. Its polarity varies according to the content of Vinyl Acetate, which allows for nanocomposites to be obtained with organically modified clay, with no need to add compatibilizing agents. In this work nanocomposites of EVA and commercial organophilic montmorillonite were prepared by melt intercalation in a torque rheometer with rotors roller type, at 150°C for 10 minutes, monitoring the torque versus time. The concentration of Vinyl Acetate (19% and 28%), clay content (2%...

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Synthesis and thermal behaviour of layered silicate–EVA nanocomposites

Cited by 456 publications

References 4 publications

The thermal degradation of poly(vinyl acetate) and poly(ethylene-co-vinyl acetate), Part I: Experimental study of the degradation mechanism

The thermal degradation of poly(vinyl acetate) and poly(ethylene-co-vinyl acetate), Part I: Experimental study of the degradation mechanism

Synthetic, layered nanoparticles for polymeric nanocomposites (PNCs)

Influência das condições de mistura e dos teores de Acetato de Vinila e de argila nas propriedades de nanocompósitos de EVA/montmorilonita organofílica

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