刚性链嵌段共聚物的研究(I)——聚醚醚酮-聚醚砜嵌段共聚物结构与性能

Studies on the Rigid-Rigid Block Copolymers(Ⅰ)——The Structure and Properties of PEEK-PES Block Copolymers

本文以聚醚醚酮(PEEK)和聚醚砜(PES)齐聚物为原料,通过溶液缩聚法制备PEEK-PES嵌段共聚物,并用DSC、TGA、WAXD和动态粘弹谱等手段对其相容性、结晶行为、动态力学性能和热性能进行了研究.结果表明,嵌段共聚物在PEEK链段(?)_n=1×10~4,PES链段(?_n)=3500～250(PES含量为25.0％～2.9％)组成范围内不产生微相分离,保持了结晶性能,其玻璃化转变温度比纯PEEK提高将近20℃,并具有较好的高温力学性能.

A series of block copolymers of polyetheretherketone (PEEK) and polyethersuifone (PES) were prepared by polycondensation of two oligomers.Some properties of the copolymers were investigated by DSC,TGA,WAXD,and dynamic viscoelastic measurement.The results show that for the copolymers in this study no phase separation is observed.The copolymers are crystalline polymers similar to PEEK,moreover Tg of a copolymer is about 20℃higher than that of PEEK,and they also have a better high temperature mechanical property.