Morphological study on the effect of elastomeric impact modifiers in polypropylene systems

Kocsis, J. Karger; Kalló, A.; Szafner, A.; Bodor, G.; Sényei, Zs.

doi:10.1016/0032-3861(79)90039-9

Cited by 184 publications

(64 citation statements)

References 16 publications

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“…It was mentioned that glass fibers can increase the crystallinity density but on the other hand decreases the size of produced crystallites. 32 Also rubber copolymers can act as nucleation agents in PP 33,34 and polyamides. 35 In the last case it was fount that the hydrogen-bonded planes have a preferred parallel orientation to the rubber-matrix interface.…”

Section: Thermal Analysismentioning

confidence: 99%

Rubber toughening of glass fiber reinforced nylon‐6,6 with functionalized block copolymer SEBS‐g‐MA

et al. 2002

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ABSTRACT:The toughening of glass fiber reinforced nylon-6,6 (PA-6,6) by using the functionalized triblock copolymer styrene-(ethylene-co-butylene)-styrene, grafted with maleic anhydride (SEBS-g-MA) was examined. Blends containing 2.5, 5, 7.5, 10, and 12.5 wt% copolymer were prepared by melt blending in a single-screw extruder. Emphasis was given to the study of mechanical properties in comparison with morphology and thermal properties of the aforementioned samples. Although the amount of SEBS-g-MA that was added in PA-6,6 was not enough to produce a super-tough material, a significant increase in the resistance to crack propagation and impact strength was observed in all blends. This behavior was proportional to the amount of SEBS-g-MA that was added for samples having up to 10%, rubber, while additional amounts seem to have no further effect. A small decrease in tensile strength was also observed. From FTIR spectroscopy and DSC analysis it was shown that the grafting extent of SEBS-g-MA to PA-6,6 was very low.

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Section: Thermal Analysismentioning

confidence: 99%

Rubber toughening of glass fiber reinforced nylon‐6,6 with functionalized block copolymer SEBS‐g‐MA

et al. 2002

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“…The TEM micrograph in Figure 6 shows that some amount of the added SBS is dispersed in the PP matrix where it can act as an impact modifier, namely, it is well known that thermoplastic elastomers are very efficient toughening agents. 44 Additionally, SBS has an effect on the crystallization process of the PP matrix, and by changing of structural characteristics of PP, especially the spherulite size, 45 it can contribute to higher toughness. From Figure 22, it can be concluded that SBS, even in low amounts, contributes to improvements in impact resistance when the PP/PS weight ratio is 90/10 or 70/30, but all blends with a PP/PS 50/50 weight ratio have poor notched impact strength.…”

Section: Impact Resistancementioning

confidence: 99%

Compatibilization of polypropylene/polystyrene blends with poly(styrene-b-butadiene-b-styrene) block copolymer

Radonjič

Musil

Šmit

1998

J. Appl. Polym. Sci.

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ABSTRACT:The compatibilizing effect of the triblock copolymer poly(styrene-b-butadiene-b-styrene) (SBS) on the morphology and mechanical properties of immiscible polypropylene/polystyrene (PP/PS) blends were studied. Blends with three different weight ratios of PP and PS were prepared and three different concentrations of SBS were used for investigations of its compatibilizing effects. Scanning electron microscopy (SEM) showed that SBS reduced the diameter of the PS-dispersed particles as well as improved the adhesion between the matrix and the dispersed phase. Transmission electron microscopy (TEM) revealed that in the PP matrix dispersed particles were complex ''honeycomblike'' aggregates of PS particles enveloped and joined together with the SBS compatibilizer. Wide-angle X-ray diffraction (WAXD) analysis showed that the degree of crystallinity of PP/PS/SBS slightly exceeded the values given by the addition rule. At the same time, addition of SBS to pure PP and to PP/PS blends changed the orientation parameters A 110 and C significantly, indicating an obvious SBS influence on the crystallization process in the PP matrix. SBS interactions with PP and PS influenced the mechanical properties of the compatibilized PP/PS/SBS blends. Addition of SBS decreased the yield stress and the Young's modulus and improved the elongation at yield as well as the notched impact strength in comparison to the binary PP/PS blends. Some theoretical models for the determination of the Young's modulus of binary PP/PS blends were used for comparison with the experimental results. The experimental line was closest to the series model line.

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“…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 mecânicas do PP, tais como dureza e rigidez são notavelmente reduzidas o que limita o campo de aplicação destes materiais [12] .…”

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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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Morphological study on the effect of elastomeric impact modifiers in polypropylene systems

Cited by 184 publications

References 16 publications

Rubber toughening of glass fiber reinforced nylon‐6,6 with functionalized block copolymer SEBS‐g‐MA

Rubber toughening of glass fiber reinforced nylon‐6,6 with functionalized block copolymer SEBS‐g‐MA

Compatibilization of polypropylene/polystyrene blends with poly(styrene-b-butadiene-b-styrene) block copolymer

Uso de argila organofílica na compatibilização de misturas PP/EPDM

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