CJCU

Chem. J. Chinese Universities ›› 2003, Vol. 24 ›› Issue (2): 362.

• Articles • Previous Articles     Next Articles

Memory Effects for Depolarized Light Intensity and the Order in the Glassy PET

BIAN Jie1,2, YE Sheng-Rong1, Lü Guang-Lie1, FENG Lin-Xian1   

  1. 1. Department of Polymer Science and Engineering, Zhejing University, Hangzhou 310027, China;
    2. Department of Chemistry, Hangzhou Teachers College, Hangzhou 310012, China
  • Received:2002-11-12 Online:2003-02-24 Published:2003-02-24

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Abstract: It was demonstrated that some level of order exists in glassy poly(ethylene terephthalate) by depolarized light intensity(DLI) technique, but this order is different from that in crystalline PET. The degree of order in glassy PET decrease with increasing temperature between 288-343 K. The active energy of this transition is about 22.56 kJ/mol. The IR analysis indicated that this order relates to gauche structure of the ethyleneglycol fragments. The decrease of order with temperature comes from the increase of distance between the order segments.

Key words: Polyethylene terephthalate(PET), Glassy state, Order structure, Depolarized light intensity, Memory effects

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