Non-isothermal Crystallization Behavior and Kinetics of Metallocene Short Chain Branched Polyethylene

Abstract

Abstract: The non isothermal crystallization behavior and kinetics of metallocene short chain branched polyethylene were investigated via DSCat cooling rates from 2.5 to 20 ℃/min, and subsequent heating at rate of 10 ℃/min. To verify the effect of molecular weight and branching content on crystallization, three group samples were chosen: (1) linear polyethylene with low molecular weight and high molecular weight; (2) low molecular weight polyethylene with low branching content and high branching content; (3) high molecular weight polyethylene with low branching content and high branching content. The results show that crystallization temperature, crystallinity, melting temperature and crystallization rate are highly branching content dependent. Molecular weight effect is less important, compared to branching content. Adramatic decrease of crystallization temperature, crystallinity, crystallization rate and melting temperature was observed for branched samples. The non isothermal kinetics was analyzed via the methods developed by Gupta and Mo Zhi shen, and good agreement was obtained.

Key words: Metallocene short branched polyethylene, Non-isothermal crystallization, Molecular weight, Branching content

CLC Number:

O632.12

TrendMD:

PENG Ya, FU Qiang, LIU Jie-Ping, HE Tian-Bai . Non-isothermal Crystallization Behavior and Kinetics of Metallocene Short Chain Branched Polyethylene[J]. Chem. J. Chinese Universities, 2002, 23(6): 1183.

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Non-isothermal Crystallization Behavior and Kinetics of Metallocene Short Chain Branched Polyethylene

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