聚醚醚酮齐聚物固相增黏及聚合物性质研究

以环丁砜为溶剂合成齐聚物,采用齐聚物在双转子密炼机中进一步固相增黏的聚合方式制备了聚醚醚酮(PEEK)。研究了不同增黏时间对PEEK结晶、热学和流动性能等的影响。结果表明,随着聚合时间增加,PEEK结晶度和结晶完善程度逐渐降低,且增黏5 h制得的PEEK的结晶度较齐聚物降低约31.4%;所有聚合物900℃时残炭量仍大于50%,具有优异的热稳定性;PEEK熔体黏度随增黏时间增加逐渐增大,约为齐聚物的13~360倍。

Polyether ether ketone(PEEK)oligomers were synthesized through a solution reaction using sulfolane as a sol-vent,the resultant oligomers were employed to synthesize high melt viscosity PEEK through solid-state polymerization in a twin-roller mixer.The effects of polymerization time on the crystallization properties,thermal properties and flowability of PEEK were investigated.The results indicated that both the degree of crystallinity and crystallization completeness of PEEK decreased with an increase in polymerization time.The degree of crystallinity of PEEK after polymerization for 5 h decreased by about 31.4%as compared to that of the oligomers.All samples possessed residual weights greater than 50%at 900℃,indicating outstanding thermal stability.In addition,the melt viscosities of PEEKs increased significantly with an increase in the polymerization time,and it reached approximately 13~360 times as high as that of oligomers.