Study on solid-state polymerization and performance of PEEK oligomers
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.
polyether ether ketoneoligomersolid state polymerizationcrystallization propertythermal property
万方数据
维普
