Fracture behavior of thermoplastic polyolefin/clay nanocomposites

Tjong, S.C.; Ruan, Yonghong

doi:10.1002/app.28560

Cited by 24 publications

(22 citation statements)

References 41 publications

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“…Isto possibilita a utilização dos nano-TPOs na indústria automobilística, podendo substituir outros termoplásticos de engenharia para melhorar o processamento bem como a reciclabilidade [16] . Embora nanocompósitos a base de TPO (PP/EPDM) tenham sido preparados com sucesso por muitos grupos [17][18][19][20][21][22][23] as propriedades dos nano-TPOs são altamente dependentes de fatores como: tipo dos componentes, composição da mistura (razão de PP e EPDM) e, principalmente, tipo e teor de argila organofílica, bem como do grau de dispersão e de interação química desta com a matriz polimérica. Portanto, neste estudo foi avaliado o efeito de uma argila bentonita, proveniente de indústria local, na morfologia e propriedades mecânicas de misturas PP/EPDM (poliolefinas termoplásticas-TPOs), preparadas com variadas razões PP:EPDM, não compatibilizadas e compatibilizadas com polipropileno modificado com anidrido maleico (PP-g-MA).…”

Section: Propriedades Mecânicasunclassified

Uso de argila organofílica na compatibilização de misturas PP/EPDM

Ferreira¹,

Leite

Siqueira

et al. 2011

Polímeros

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Resumo: Misturas PP/EPDM com variadas razões PP:EPDM, não compatibilizadas e compatibilizadas com o polipropileno modificado com anidrido maleico (PP-g-MA), foram preparadas por fusão. A influência da adição de 1 pcr de uma argila bentonita na morfologia, propriedades mecânicas e reológicas destas misturas foi avaliada. A bentonita empregada como carga, proveniente da Bentonit União Nordeste/PB foi purificada e modificada organicamente com tecnologia desenvolvida por nosso grupo de pesquisa, antes de ser adicionada às misturas. Os dados de difratometria de raios X mostraram que, para diferentes razões de PP:EPDM na mistura a incorporação de 1 pcr de argila organofílica resultou na formação de nanocompósitos intercalados desordenados (20 ou 40% de EPDM) ou intercalados/ esfoliados (10 e 30% EPDM). A incorporação da argila organofílica provocou alterações nas propriedades morfológicas, mecânicas e reológicas das misturas, especialmente daquelas preparadas com 30% em massa de EPDM onde a ação compatibilizante da argila foi observada. Palavras-chave: Blendas PP/EPDM, argila organofílica, compatibilização. The Use of an Organoclay on the Compatibilization of PP/EPDM BlendsAbstract: PP/EPDM blends with different PP:EPDM ratios, non-compatibilized and compatibilized with maleic anhydride grafted polypropylene (PP-g-MA) were prepared by melting. The influence of 1 phr bentonite clay addition on the morphology, mechanical and rheological properties of these blends was evaluated. The bentonite used as a filler, provided by Bentonit União Nordeste/PB, was purified and organically modified with a technology developed by our research group, before being added to the blends. X-ray diffraction results showed that, for blends having different PP:EPDM ratios, 1 phr organoclay addition led to the formation of intercalated (20 or 40% EPDM) or intercalated/exfoliated (10 and 30% EPDM) nanocomposites. The morphological, mechanical and rheological properties of the blends were modified by organoclay addition, especially for those with 30 wt% of EPDM, where a compatibilizing effect of the organoclay was observed. Keywords: PP/EPDM blends, organoclay, compatibilization. IntroduçãoO desenvolvimento de misturas (blendas) poliméricas é de grande interesse acadêmico e industrial por ser uma prática relativamente simples de criar materiais com propriedades desejadas [1,2] . A mistura de polipropileno (PP) com elastômeros visa melhorar sua resistência ao impacto (tenacidade) a baixas temperaturas. Vários elastômeros são usados como modificadores de impacto para o PP, incluindo poliisobutileno [3] , copolímero em bloco de estireno-butadieno [4] , poliisopreno [5] e borracha natural [6] , mas os copolímeros de etileno-propileno (EPR) [7] e os terpolímeros de etileno-propileno-dieno (EPDM) [8][9][10][11] têm sido mais eficientes para esta aplicação.Estudos reportados na literatura têm mostrado que a incorporação do EPDM ao PP resulta na obtenção de PP tenacificado, também denominado poliolefina termoplástica (TPO). Contudo, algumas propriedades...

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Section: Propriedades Mecânicasunclassified

Uso de argila organofílica na compatibilização de misturas PP/EPDM

Ferreira¹,

Leite

Siqueira

et al. 2011

Polímeros

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“…These micrographs reveal the formation of an intercalated structure. In this regard, TEM can provide useful information and conclusive evidence concerning the morphology, structure, and spatial distribution of dispersed clay platelets in the polymer matrix [40]. In addition, TEM photographs could allow us to establish the silicate dispersion grade.…”

Section: Resultsmentioning

confidence: 99%

Polymer–montmorillonite nanocomposites: Chemical grafting of polyvinyl acetate onto Cloisite 20A

Mansoori¹,

Akhtarparast²,

Zamanloo³

et al. 2011

Polymer Composites

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This paper is an account of the experiments on grafting polyvinyl acetate onto organophilic montmorillonite. Cloisite 20A was reacted with vinyltrichlorosilane to replace the edge hydroxyl groups of the clay with a vinyl moiety. Because the reaction liberates HCl, it was performed in the presence of sodium hydrogencarbonate to prevent the exchange of quaternary alkylammonium cations with H+ ions. Only the silanol groups on the edge of the clay react with vinyltrichlorosilane. After the reaction, the product maintained the same basal spacing as the precursor. The radical polymerization of the product with vinyl acetate as a vinyl monomer leads to chemical grafting of polyvinyl acetate onto montmorillonite surface. The homopolymer formed during polymerization was separated from the grafted organoclay by Soxhelt extraction. Chemical grafting of the polymer onto Cloisite 20A was confirmed by infrared spectroscopy. The prepared nanocomposite materials and the grafted nano‐particles were studied by XRD, SEM, and TEM. Exfoliated nanocomposite was obtained for 0.5% clay content. Nanocomposites with 1% and 3% clay contents showed significant intercalation and agglomeration occurred at higher clay loadings. The nanocomposites were studied by thermogravimertic analysis (TGA) and dynamic mechanical analysis (DMTA). Improved thermo‐mechanical properties were observed for nanocomposite with 0.5% clay content. POLYM. COMPOS., © 2011 Society of Plastics Engineers.

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“…In some case, it is useful to combine reinforcement with rubber toughening to balance end use performance. [13][14][15] In general, PA6 (polyamide-6) is able to easily intercalate into organoclay layers to form exfoliated clay structure due to strong interaction between PA6 and clay generated by both their polarity and hydrogen-bonding capacity, which gives PA6 nanocomposites excellent properties. [16,17] There are many reports focused on polyamide/maleated elastomer/organoclay composites.…”

Section: Introductionmentioning

confidence: 99%

Effect of Mixing Sequence on Phase Morphology and Mechanical Properties in Polyamide 6/Butadiene (Core) Styrene Acrylonitrile-G-Maleic Anhydride (Shell) Latex/Organoclay Ternary Nanocomposites

Zhou

et al. 2015

Journal of Macromolecular Science, Part B

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Ternary nanocomposites based on polyamide-6, maleated butadiene (core) -acrylonitrile-styrene (shell) rubber particles (PB-g-SAM), and modified montmorillonite (organoclay) were prepared by a twin-screw extruder. The glassy shell of the core-shell particles can act as a barrier which can resist the entrance of clay into the rubber phase. The influence of mixing sequence on the phase morphology and mechanical properties were studied. The microstructure of the ternary nanocomposites was characterized by X-ray diffraction, transmission electron microscopy, and scanning electron microscopy. It was found that the clay in the polyamide nanocomposites was partially exfoliated, exhibiting a mixture of exfoliated structures. The organoclay plates affected the interfacial adhesion between the polyamide-6 and the core-shell particles. The location of the organoclay plates in the blends with different mixing sequences produced differences of the mechanical properties. The results of mechanical testing revealed that the optimum mixing sequence to achieve balanced mechanical properties was mixing the polyamide-6 and organoclay first followed by mixing with the core-shell particles.

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Fracture behavior of thermoplastic polyolefin/clay nanocomposites

Cited by 24 publications

References 41 publications

Uso de argila organofílica na compatibilização de misturas PP/EPDM

Uso de argila organofílica na compatibilização de misturas PP/EPDM

Polymer–montmorillonite nanocomposites: Chemical grafting of polyvinyl acetate onto Cloisite 20A

Effect of Mixing Sequence on Phase Morphology and Mechanical Properties in Polyamide 6/Butadiene (Core) Styrene Acrylonitrile-G-Maleic Anhydride (Shell) Latex/Organoclay Ternary Nanocomposites

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