Effect of γ-Ray Irradiation on Chain Structure and Crystallization Behavior of Isotactic Polypropylene

doi:10.3969/j.issn.0251-0790.2012.04.036

Abstract

Abstract: The structure and crystallization behavior of isotactic polypropylene(iPP) irradiated by γ-ray, were investigated by a combination of gel permeation chromatography(GPC), Fourier transform infrared spectroscopy(FTIR) and differential scanning calorimetry(DSC). The results indicated that γ-ray irradiation led to the formation of hydroxyl and carbonyl groups on iPP main chains as well as the degradation of iPP macromolecules. As the irradiation dose was lower than 50 kGy, the crystallization temperature(T_c) of irradiated iPP increased slightly with the increase of irradiation dose. However, the T_c of irradiated iPP decreased obviously, when the irradiation dose is above 50 kGy, and the melting peak of iPP moved to lower temperature and split into two peaks. The overall isothermal crystallization kinetics of unirradiated and irradiated iPP were analyzed by the Avrami equation. The values of Avrami exponent n are close to 3, indicating that iPP nucleates in the heterogeneous manner regardless of the crystallization temperature and the irradiation dose. The DSC data indicated that the overall crystallization rates decrease with the increase of crystallization temperature and radiation dose. The relationship between chain structure change and crystallization rate was discussed.

Key words: Isotactic polypropylene(iPP), γ-Irradiation, Chain structure, Crystallization behavior

CLC Number:

O631

TrendMD:

ZHOU Li-Juan, ZHANG Xiu-Qin, LI Rong-Bo, SU Yun-Lan, ZHAO Ying, XU Duan-Fu. Effect of γ-Ray Irradiation on Chain Structure and Crystallization Behavior of Isotactic Polypropylene[J]. Chem. J. Chinese Universities, 2012, 33(04): 850.

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