Morphology and Properties of PP In-reactor Alloys Prepared with a MgCl2/TiCl4/Diisobutyl Phthalate/Phosphate Tris-methylphenyl Ester Catalyst System

doi:10.1007/s40242-017-7140-8

Abstract

Abstract: A series of polypropylene(PP)/poly(ethylene-co-propylene) in-reactor alloys with different ethylene contents was prepared through a two-stage polymerization process using a MgCl₂/TiCl₄/diisobutyl phthalate/phosphate tris-methylphenyl ester catalyst system. The ethylene content, particle shape, fractured surface, and glass-transition temperature(T_g) of the obtained PP in-reactor alloys were characterized by means of nuclear magnetic resonance, scanning electron microscopy(SEM), and dynamic mechanical analysis(DMA). The ethylene content of the PP alloys increased from 2.34% to 26.69% when the propylene/ethylene feed ratio was increased from 66/34 to 54/46(molar ratio). Morevoer, the increment in ethylene content increased the notched Izod impact strength of the resulting PP alloys. The impact strength of the PP alloy with an ethylene content of 26.69% was 55.8 kJ/m², which is 12.7 times that of isotactic polypropylene. The results of DMA and SEM analysis reveal that ethylene-propylene random copolymer(EPR) in the PP alloy has a low T_g of ca. -50 ℃ and a high interface compatibility with the PP matrix. The excellent impact performance of the PP alloy can be attributed to the uniform dispersal of EPR in the alloy particles and PP matrix.

Key words: Polypropylene in-reactor alloy, Phosphate, Ziegler-Natta catalyst, Ethylene-propylene random copolymer, Toughening mechanism

ZHANG Chunyu, DONG Bo, ZHANG Hexin, HU Yanming, ZHANG Xuequan. Morphology and Properties of PP In-reactor Alloys Prepared with a MgCl₂/TiCl₄/Diisobutyl Phthalate/Phosphate Tris-methylphenyl Ester Catalyst System[J]. Chemical Research in Chinese Universities, 2018, 34(1): 145-150.

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Morphology and Properties of PP In-reactor Alloys Prepared with a MgCl₂/TiCl₄/Diisobutyl Phthalate/Phosphate Tris-methylphenyl Ester Catalyst System

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