Multiple morphology in polypropylene/ethylene-propylene-diene terpolymer blends

Pukánszky, Béla; Tüdős, F.; Kalló, A.; Bodor, G.

doi:10.1016/0032-3861(89)90207-3

Cited by 90 publications

(47 citation statements)

References 24 publications

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“…PP was also observed to crystallize at an extraordinarily low temperature (50°C) by Pukanszky et al 28 in a PP (20%)-EPDM (80%) blend after the crystallization peak of EPDM, which was attributed to a different nucleation mechanism. They proposed that, at 20% concentration, PP existed as discrete domains in the PP-EPDM blend.…”

Section: Melting and Crystallizationmentioning

confidence: 89%

Isothermal crystallization and spherulite structure of partially miscible polypropylene–linear low‐density polyethylene blends

Shanks

2001

J of Applied Polymer Sci

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ABSTRACT:Polypropylene (PP) was blended with a linear low-density polyethylene (LLDPE, containing 5% hexene comonomer) over a composition range of 10 -90% of PP. The crystallization and morphology of the PP-LLDPE blends were studied by differential scanning calorimetry (DSC), polarized optical microscopy with a hot stage (HSOM), and scanning electron microscopy (SEM). In particular, the isothermal crystallization of PP in molten LLDPE was investigated. It was observed that the crystallization and melting behavior of PP and LLDPE changed in the blends, indicating that there was some degree of miscibility between the PP and the LLDPE. A depression of the equilibrium melting temperature (T m 0 ) of PP in the blends with no more than 15% of PP confirmed that PP was miscible with LLDPE at and below 15% of PP. In addition, a drastic decrease in T m 0 from the 25% PP blend to the 20% blend led us to conclude that the miscible behavior between PP and LLDPE became favorable at a PP concentration of 20%. The optical microscopic images showed that, in the blends with 10 and 15% of PP, the PP crystallized as open-armed diffuse spherulites, similar to those in the miscible blends. In contrast, the PP crystallized in a phase-separated matrix or droplets with more than 25% of PP, when obvious phase separation occurred. The SEM image revealed that the PP lamella was able to penetrate the PP and LLDPE phase boundary and grow in the LLDPE phase. The above results displayed that the PP dissolved in the LLDPE, and, particularly, when the PP concentration was below 20%, the dissolution was substantial.

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Section: Melting and Crystallizationmentioning

confidence: 89%

Isothermal crystallization and spherulite structure of partially miscible polypropylene–linear low‐density polyethylene blends

Shanks

2001

J of Applied Polymer Sci

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“…Elastomeric rubber-plastic blends have been technologically interesting for use as thermoplastic elastomers. 6,7 They not only exhibit some of the physical properties of the conventional elastomers at the service temperatures but also at the same time are processable at elevated temperatures.…”

Section: Introductionmentioning

confidence: 99%

“…The melt blending of i-PP with different elastomers and rubbers such as butyl rubber, ethylene-propylene copolymers, ethylene-propylene-diene terpolymers, polyisobutylene, and styrene-butadiene block copolymers has been carried out for improving the impact strength of PP especially at low temperatures. [3][4][5][6][7] Earlier studies on PP/EVA blends have proved EVA as an impact modifier for i-PP. 10,11 While linear viscoelastic and transient behaviors were studied by Tyagi and Ghosh, 12 the morphological, mechanical, and rheological properties of these blends using homopolymer polypropylene were reported by several researchers in separate studies.…”

Section: Introductionmentioning

confidence: 99%

Effect of flexibility of ethylene vinyl acetate and crystallization of polypropylene on the mechanical properties of i‐PP/EVA blends

Kakkar¹,

Maiti²

2011

J of Applied Polymer Sci

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Polymer blend technology has been widely used for the past several years for the modification or enhancement of mechanical properties of polymers to obtain an overall balance of properties over those of the constituents. Despite its interesting mechanical and thermal properties, the impact strength of polypropylene leaves wide scope for improvement. A series of blends of ethylene vinyl acetate (EVA) copolymer with an impact grade of isotactic polypropylene (i-PP) were prepared by single screw extrusion at 0-0.32 volume fraction of the dispersed phase. The mechanical properties such as tensile behavior, elongation-at-break, and impact strength of these blends systems as well as crystallinity were evaluated. Crystallinity data have been used in greater depth to support the mechanical properties. Differential scanning calorimetry studies conducted to study the modification in crystallinity of the crystalline component, i-PP, of the blend revealed that the rubber component of the blend enhanced the crystallinity of i-PP phase by providing sites for nucleation. Tensile modulus and strength decreased while the impact strength and breaking elongation enhanced with blending elastomer concentration. The improved properties of these PP/EVA blends are encouraging for carrying out further work on this system (composites) and suggest potential high impact strength applications for PP.

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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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Multiple morphology in polypropylene/ethylene-propylene-diene terpolymer blends

Cited by 90 publications

References 24 publications

Isothermal crystallization and spherulite structure of partially miscible polypropylene–linear low‐density polyethylene blends

Isothermal crystallization and spherulite structure of partially miscible polypropylene–linear low‐density polyethylene blends

Effect of flexibility of ethylene vinyl acetate and crystallization of polypropylene on the mechanical properties of i‐PP/EVA blends

Uso de argila organofílica na compatibilização de misturas PP/EPDM

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