Chinese Journal of Applied Chemistry ›› 1996, Vol. 0 ›› Issue (2): 57-60.

• Full Papers • Previous Articles     Next Articles

Transformation of Tg and Tm for PEEKK-PEBEKK Copolymers with Various Biphenyl Content

Zhang Hongfang1, Mo Zhishen1, Na Hui2, Wu Zhongwen2   

  1. 1. Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022;
    2. Department of Chemistry, Jilin University, Changchun
  • Received:1995-08-30 Revised:1995-11-27 Published:1996-04-10 Online:1996-04-10

Abstract: Transformational behaviour of Tg and Tm for PEEKK-PEBEKK copolymers with various biphenyl content was studied by using DSC. Results revealed that the glass transition temperature Tg for the copolymers gradually increased with increasing biphenyl content nB. The melting points Tm of the copolymers obviously depended on nB. Tm value was minimum when nB=0.35. Heat behaviour of the copolymers could be markedly changed by heat treatment. Behaviour of double melting peak for the copolymer resulted from the crystal melting and the recrystallization was also studied.

Key words: poly (ether ether Ketone ketone)-poly (ether biphenyl ether ketone ketone) copolymer, transformation of Tg and Tm, DSC, heat treatment