Studies on Non-Isothermal Crystallization Kinetics of iPS-b-iPP Block Copolymer

Chem. J. Chinese Universities ›› 1995, Vol. 16 ›› Issue (12): 1972.

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Studies on Non-Isothermal Crystallization Kinetics of iPS-b-iPP Block Copolymer

XU Guang-Xue, LIN Shang-An

Institute of Polymer Science, Zhongshan University, Guangzhou, 510275

Received:1994-12-28 Revised:1995-04-25 Online:1995-12-24 Published:1995-12-24

Abstract

Abstract: The non-isothermal crystallization kinetics of iPS-b-iPP block copolymers has been investigated by DSC.The results based on the Jeziorny's method show that in the range of cooling rate of 5 to 20℃/min, the kinetics of non-isothermal crystallization for all of samples is fitted for the Avrami equation quite well. The crystallization rate constant Z_crelates to the cooling rate, whereas the specific crystallizability G_cis dependent upon both the cooling rate and composition ratio of iPS-b-iPP copolymers.In addition, a discussion about the relationship between the growing mechanism of crystals and the composition ratio of iPS-b-iPP copolymers was made based on the Avrami exponents. Anew kinetics equation of non-isothermal crystallization derived by combining Avrami and Ozawa equation was proved to fit for kinetics of non-isothermal crystallization of iPS-b-iPPcopolymers.

Key words: Styrene-propylene isotactic block copolymer, DSC, Non-isothermal crystallization

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XU Guang-Xue, LIN Shang-An. Studies on Non-Isothermal Crystallization Kinetics of iPS-b-iPP Block Copolymer[J]. Chem. J. Chinese Universities, 1995, 16(12): 1972.

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Studies on Non-Isothermal Crystallization Kinetics of iPS-b-iPP Block Copolymer

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