High strength–toughness combination of melt intercalated nanoclay-reinforced thermoplastic olefins

Deshmane, Chinmay A.; Yuan, Qiang; Misra, R.D.K.

doi:10.1016/j.msea.2007.01.045

Cited by 41 publications

(30 citation statements)

References 35 publications

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“…Since microvoids are nucleated at the site of organoclay platelets, it is expected that the impact strength is increased with increasing organoclay dispersion, i.e., when the compatibilizer is added. These results are similar to that of Misra et al 37 for organoclay-reinforced polypropylene nanocomposites but not for organoclay-reinforced polyethylene. 27 In the latter case, it is likely that the number of sites for microvoids formation and plastic deformation was much less than in our case, hence the lower impact strength.…”

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confidence: 91%

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Influence of compatibilizer on notched impact strength and fractography of HDPE–organoclay composites

Rattanawijan

Amornsakchai

et al. 2009

J of Applied Polymer Sci

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The focus of this study was the notched impact property of high-density polyethylene (HDPE)-organoclay composites and the resultant morphology of impact-fractured surfaces. Composites with a different organoclay content and degree of organoclay dispersion were compared with neat HDPE under identical conditions. The degree of organoclay dispersion was controlled through the use of a compatibilizer, maleic anhydride grafted polyethylene. It was found that the addition of organoclay can slightly increase the elastic modulus and notched impact strength of the composite. When the level of organoclay dispersion was improved by using compatibilizer, elastic modulus and toughness further increased. A significant increase in yield strength was also notable. The presence of organoclay was found to suppress strain hardening of the matrix during tensile testing. The impactfractured surfaces of failed specimens were studied with scanning electron microscopy. The micromechanism for the increased toughness of HDPE-organoclay composites was discussed.

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confidence: 91%

“…When the stress increases or builds up again, the crack re-initiates and propagates (slips). 37 A high magnification image of a stick region is shown in Figure 5(c). An extensive drawing of fibrils can be seen.…”

Section: Impact Fractured Surfacesmentioning

confidence: 99%

Influence of compatibilizer on notched impact strength and fractography of HDPE–organoclay composites

Rattanawijan

Amornsakchai

et al. 2009

J of Applied Polymer Sci

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“…[39] It seems, nevertheless, that the HPP matrix is more effective in increasing the yield stress, as a slight raise is observed, probably due to the better interaction between the clay and the elastomeric phase, as it has been recently demonstrated. [45,46] These works also reveal that the compatibilizer, the content of clay, and the relative amount of the elastomeric phase are relevant parameters to understand the yield point in polyolefin thermoplastic elastomers.…”

Section: Mechanical Propertiesmentioning

confidence: 98%

Effect of the Hierarchical Structure in Poly(propylene)/Clay Composites on their Thermal Stability: From Single‐ to Multi‐Step Degradation Processes

Palza

Yazdani‐Pedram

2010

Macro Materials & Eng

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Composites with several hierarchical structures were prepared by using different clays, compatibilizers, and PPs. TGA showed that the thermal stability of the composites can be strongly improved, under either inert or thermo‐oxidative conditions, depending on the type of clay and its morphology. Drastic increases in the temperature of the maximum rate of weight loss (ΔTpeak ≈ 170 °C) under thermo‐oxidative conditions were observed depending on the clay dispersion. Furthermore, some composites had a complex multi‐step degradation behavior instead of a single‐step process related with different clay morphologies that can be present simultaneously. Finally, it was concluded that the TGA has a higher sensitivity toward the composite morphology than the mechanical properties.

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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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High strength–toughness combination of melt intercalated nanoclay-reinforced thermoplastic olefins

Cited by 41 publications

References 35 publications

Influence of compatibilizer on notched impact strength and fractography of HDPE–organoclay composites

Influence of compatibilizer on notched impact strength and fractography of HDPE–organoclay composites

Effect of the Hierarchical Structure in Poly(propylene)/Clay Composites on their Thermal Stability: From Single‐ to Multi‐Step Degradation Processes

Uso de argila organofílica na compatibilização de misturas PP/EPDM

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