Conformation Transformation of Syndiotactic Polypropylene Induced by Stretching and Annealing

Chem. J. Chinese Universities ›› 1999, Vol. 20 ›› Issue (3): 486.

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Conformation Transformation of Syndiotactic Polypropylene Induced by Stretching and Annealing

ZHANG Bin, YANG De-Cai

Polymer Physics Laboratory, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun, 130022

Received:1998-03-18 Online:1999-03-24 Published:1999-03-24

Abstract

Abstract: Conformation transformation of syndiotactic polypropylene(sPP) induced by stretching and annealing processes has been investigated by WAXD, IRand DSC. The results indicate that not only the quenched samples but also the isothermally crystallized samples can form the crystals with alltrans conformation by means of uniaxially stretching at room temperature. The alltrans conformation crystals are of metastability, which can transform to stable crystals with (TTGG)₂helical conformation at higher annealing temperatures.

Key words: Syndiotactic polypropylene, Stretching, Conformation transformation

CLC Number:

O631

TrendMD:

ZHANG Bin, YANG De-Cai . Conformation Transformation of Syndiotactic Polypropylene Induced by Stretching and Annealing[J]. Chem. J. Chinese Universities, 1999, 20(3): 486.

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Conformation Transformation of Syndiotactic Polypropylene Induced by Stretching and Annealing

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