Morphological and mechanical properties of polypropylene [PP]/poly(ethylene vinyl acetate) [EVA] blends. I. Homopolymer PP/EVA systems

Ramı́rez-Vargas, E.; Navarro-Rodríguez, Dámaso; Huerta-Martínez, B. M.; Medellín‐Rodríguez, F. J.; Lin, J. S.

doi:10.1002/pen.11356

Cited by 34 publications

(27 citation statements)

References 31 publications

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“…The observed melting point depression for these blends suggests compatibility or partial miscibility, being more noticeable for the PP‐ r ‐EP/EVA blend. This variation on the melting temperature ( T m ) has been reported in studies of PP/EVA blends10, 11 and in blends of heterophasic copolymers PP‐EP with EVA 12. In these studies, the authors assigned the melting temperature depression to compatibility or partial miscibility, attributed to interface interactions between blend components.…”

Section: Resultssupporting

confidence: 54%

“…A particularly interesting blend is PP/EVA because of the ready availability of these materials, principally as recycled materials. These blends, considered as immiscible, have been widely studied to elucidate the compatibility mechanisms 6–12. Gupta et al,7 have studied the morphology, rheology and mechanical properties of PP/EVA blends, finding that the impact strength was enhanced with higher than 30% EVA content, and that the impact strength was also a function of the VA (9, 12, and 19%) content of EVA which was related to the reported morphologies.…”

Section: Introductionmentioning

confidence: 99%

“…In our research group, different studies on this type of blend have been performed. In one study of PP/EVA blends11 the compatibility of the system at contents of EVA (28% of VA) above 40% was reported where a T g shift and an enhancement of the impact strength and elongation at break was observed. This was attributed to the morphology evolution and to the interaction between amorphous interfaces.…”

Section: Introductionmentioning

confidence: 99%

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Effect of heterophasic or random PP copolymer on the compatibility mechanism between EVA and PP copolymers

Ramı́rez-Vargas

Huerta-Martínez

Medellín‐Rodríguez

et al. 2009

J of Applied Polymer Sci

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Compatibility mechanisms between EVA and PP copolymers (C-PP) blends have been studied as a function of the type of copolymer, using a heterophasic PP copolymer (PP-EP) and a random PP copolymer (PP-r-EP), with similar ethylene content. The morphology and thermal and mechanical properties of PP/EVA blends with different levels of EVA containing 28% vinyl acetate (VA) were determined. The obtained results indicated compatibility for both systems showing interactions at the amorphous interfaces; however, this interaction was higher for the PP-r-EP/EVA, which showed a single glass transition temperature and changes in the PP crystalline fraction (changes in the fusion temperature and in the diffraction patterns). The evolution of the morphology from isolated spherical domains (20% EVA) to elongated shapes (40% EVA) was related to the observed changes in thermal and mechanical properties. The impact strength and deformation properties showed significant improvement with increasing EVA content above 40% where the highest values of elongation for the PP-r-EPand of impact strength for the PP-EP were obtained.

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Section: Resultssupporting

confidence: 54%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Effect of heterophasic or random PP copolymer on the compatibility mechanism between EVA and PP copolymers

Ramı́rez-Vargas

Huerta-Martínez

Medellín‐Rodríguez

et al. 2009

J of Applied Polymer Sci

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“…[12][13][14][15] Dynamic-mechanical analysis and morphology studies of PP/EVA blends reveal two glass transitions and phase separation, 16 but recently, miscibility at high EVA contents was reported. 17 LDPE has been employed to promote miscibility in the PP/EVA blends. 18 Interpenetrated networks have been found in PP/EVA blends where the EVA phase has been extracted using toluene.…”

Section: −190mentioning

confidence: 99%

PP/EVA blends: Mechanical properties and morphology. Effect of compatibilizers on the impact behavior

2005

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ABSTRACT:The mechanical properties of blends of isotactic polypropylene (PP) and poly[ethylene-co-(vinyl acetate)] (EVA) are studied under tension at several temperatures (from -30• C to room temperature). The morphology and thermal properties are given attention at every stage of the stretching process. To improve the impact resistance of the blends, poly[propylene-graft-(maleic anhydride)] (PPMA) and hydroxylated EVA (EVAOH) are used as compatibilizers. The domain size of the dispersed phase decreases with compatibilizer content, improving the impact resistance of the blends. This is accompanied with changes in the morphology of such systems. C

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“…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. [13][14][15][16] In this article, we report the role of the thermoplastic elastomer EVA in modifying the mechanical properties of an impact grade of i-PP. This grade of polypropylene is one in which, EPR, the known impact modifier for PP has been incorporated during its polymerization process and thus becomes an integral part of PP.…”

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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Morphological and mechanical properties of polypropylene [PP]/poly(ethylene vinyl acetate) [EVA] blends. I. Homopolymer PP/EVA systems

Cited by 34 publications

References 31 publications

Effect of heterophasic or random PP copolymer on the compatibility mechanism between EVA and PP copolymers

Effect of heterophasic or random PP copolymer on the compatibility mechanism between EVA and PP copolymers

PP/EVA blends: Mechanical properties and morphology. Effect of compatibilizers on the impact behavior

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

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