Crystallization Kinetics and Morphology of High Impact Polypropylene

Chem. J. Chinese Universities

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Crystallization Kinetics and Morphology of High Impact Polypropylene

LIU Xiu-Xia^1,2, CHEN Yong¹, CHEN Ye¹, ZHANG Wan-Xi², CHEN Wei³, YANG De-Cai¹

1. State Key Laboratory of Polymer Physics and Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, China;
2. Material Science and Technology College, Jilin University, Changchun 130025, China;
3. Beijing Reserch Institute of Chemical Industry, SINOPEC, Beijing 100013, China

Received:2006-05-17 Revised:1900-01-01 Online:2006-12-10 Published:2006-12-10
Contact: YANG De-Cai

Abstract

Abstract: Crystallization kinetics and morphology of high impact polypropylene(HIPP) and polypropylene homopolymer(iPP) were studied comparatively by differential scanning calorimetry(DSC), polarized optical microscopy(PLM) and field-emission scanning electron microscopy(FESEM) techniques. The crystallization and melting temperatures of HIPP are lower than those of iPP. The results of isothermal crystallization kinetics study indicates that the crystallization half-time(t_1/2) of HIPP is longer, while its activation energy(ΔE) and chain folding surface free energy(σ_e) are higher, compared with those of iPP. These results show the partial compatibility between the copolymeric components and the matrix of HIPP, which hinders the crystallization of the matrix. The PLM and FESEM images of HIPP reveal that there are uniformly dispersed rubbery particles(ca. 1—2 μm in diameter) with a core-shell structure in the matrix of HIPP. The uniform dispersion, strong interfacial adhesion and core-shell morphology of the rubbery phase in HIPP matrix are the key factors for the superior toughness-rigidity balance of this material.

Key words: High impact polypropylene, Crystallization kinetics, Morphology

CLC Number:

O631

TrendMD:

LIU Xiu-Xia^1,2, CHEN Yong¹, CHEN Ye¹, ZHANG Wan-Xi², CHEN Wei³, YANG De-Cai¹. Crystallization Kinetics and Morphology of High Impact Polypropylene[J]. Chem. J. Chinese Universities, doi: .

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Crystallization Kinetics and Morphology of High Impact Polypropylene

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