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Thermal properties and crystallization behavior of poly(ether ether ketone ketone)/poly(ether biphenyl ether ketone ketone) copolymers

✍ Scribed by Mitsuhiro Shibata; Ryutoku Yosomiya; Zhenhua Jiang; Zhijie Fang; Zhongwen Wu

Publisher
John Wiley and Sons
Year
1996
Tongue
English
Weight
321 KB
Volume
197
Category
Article
ISSN
1022-1352

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✦ Synopsis

Abstract

Thermal properties of poly(ether ether ketone ketone) (PEEKK)/poly(ether biphenyl ether ketone ketone) (PEDEKK) copolymers were investigated by means of differential scanning calorimetry (DSC) and thermogravimetric analysis (TGA). The glass transition temperature (T~g~) increases from 154°C to 183°C as the content of PEDEKK units increases. The melting point (T~m~) of the copolymers varied in the range between 314°C and 409°C and showed the behavior of eutectic type copolymer. From the investigation of the crystallization behavior of the copolymers, it was found that the cold‐crystallization temperature (T~c′~) of the amorphous copolymers assumes a maximum value for the copolymer with a mole fraction of the PEDEKK segment (n~B~) of about 0.6, isothermally crystallized PEEKK and the PEEKK/PEDEKK copolymer exhibit double‐melting behavior.

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