Vibration-dependent Crystal Form of Isotactic Polypropylene under Nonisothermal Crystallization

Chemical Research in Chinese Universities ›› 2004, Vol. 20 ›› Issue (5): 660-664.

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Vibration-dependent Crystal Form of Isotactic Polypropylene under Nonisothermal Crystallization

SHANGGUAN Yong-gang¹, TONG Li-fang¹, PENG Mao¹, ZHENG Qiang^1,2

1. Department of Polymer Science & Engineering, Zhejiang University, Hangzhou 310027, P. R. China;
2. State Key Laboratories of Chemical Engineering, Polymer Reaction Engineering Division, Zhejiang University, Hangzhou 310027, P. R. China

Received:2003-08-28 Online:2004-10-24 Published:2011-08-06
Supported by:
Supported by the National Science Funds for Distinguished Young Scholars(No.50125312), Special Funds for Major State Basic Research Project of China(No.G1999064800) and Key Program of the National Natural Science Foundation of China(No.50133020).

Abstract

Abstract: A study concerning the effect of vibration on the crystal structure and morphology for isotactic polypropylene(iPP) was conducted.The crystallite size, crystal structure and crystallinity of iPP under or without vibration treatment were investigated by means of differential scanning calorimetry(DSC) and wideangle X-ray diffraction(WAXD).The results reveal that the crystallinity of the vibrated samples decreases at a high cooling rate, but it remains constant at a low cooling rate because of the chain relaxation of iPP.It has been found that vibration obviously increases the content of β-form of crystal phase and the amount of β-crystal mainly depends on the vibration amplitude.

Key words: Isotactic polypropylene, Vibration, Nonisothermal crystallization

SHANGGUAN Yong-gang, TONG Li-fang, PENG Mao, ZHENG Qiang. Vibration-dependent Crystal Form of Isotactic Polypropylene under Nonisothermal Crystallization[J]. Chemical Research in Chinese Universities, 2004, 20(5): 660-664.

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Vibration-dependent Crystal Form of Isotactic Polypropylene under Nonisothermal Crystallization

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