Dynamic mechanical behavior of poly(ether ether ketone)/poly(ether sulfone) block copolymers

✍ Scribed by Junkui Cao; Wencheng Su; Rongtang Ma; Zhongwen Wu; Mitsuhiro Shibata; Hiroyuku Takeishi; Ryutoku Yosomiya

• Publisher: John Wiley and Sons
• Year: 1996
• Tongue: English
• Weight: 393 KB
• Volume: 197
• Category: Article
• ISSN: 1022-1352
• DOI: 10.1002/macp.1996.021970426

✦ Synopsis

Abstract

Poly(ether ether ketone) (PEEK)/poly(ether sulfone) (PES) block copolymers were synthesized via condensation reaction between fluorine‐terminated PEEK oligomers and hydroxyl‐terminated PES oligomers. The dynamic mechanical behavior of a composite sample prepared by compression molding of a glass fibre cloth and the copolymer was investigated by means of a dynamic viscoelastometer. The β relaxation peak and the α′ relaxation peak were observed in the logarithmic decrement curve of the amorphous block copolymer of PEEK/PES. The glass transition temperature (β relaxation peak) is shifted to higher temperature and approaches a constant value as annealing time and degree of crystallinity increase. The glass transition temperature of the copolymer rises more slowly upon annealing with increasing PES content. The α′ relaxation peak becomes smaller upon annealing, and eventually disappears. The α′ relaxation peaks are related to the motion of molecules upon transition from the non‐crystalline to the crystalline state. The α′ relaxation occurs for the copolymer with a degree of crystallinity of 0 to 3%.