PEEKK/PEI共混物的相容性和力学性能

Investigation on Compatibility and Mechanical Properties of PEEKK/PEI Blends

在380℃下熔融挤出制得聚醚醚酮酮(PEEKK)与聚醚酰亚胺(PEI)共混物。采用差示扫描量热仪(DSC)、广角X射线衍射仪(WAXD)和万能力学试验机研究了共混物的相容性、结晶行为和力学性能。结果表明,PEEKK/PEI共混体系为相容体系,其Tg组成的关系符合Fox方程。随共混体系中PEI用量的增加,共混物的冷结晶温度从208℃升至280℃,熔体降温结晶温度从315℃降至260℃,熔融温度从363℃降至322℃,熔融焓在-31.5^-2.2J/g之间变化。共混物基本保持了PEEKK的力学性能,断裂伸长率随着PEI用量的增加从25%增加到60%,说明PEI对PEEKK有增韧作用。

PEEKK/PEI blends were prepared via melting extrusion at 380℃. The compatibility, crystallization behavior and mechanical properties of the blends were investigated by DSC, WAXD and UTM. The results show that the blends of PEEKK/PEI were compatible completely, all the blends exhibited a single glass transition temperature, and could be described by Fox equation. With increasing the content of PEI, the cold crystallization temperatures of the blends increased from 208 % to 280 ℃, the melting Crystallization temperatures decreased from 315℃ to 260 ℃, the melting points also decreased from 363 ℃ to 322 ℃, and melting enthalpy varied between - 31.5 J/g and - 2. 2 J/g. The blends show good mechanical properties. With increasing the content of PEI, the elongation of blends at break increased from 25% to 60%, illuminating that PEI could improve the toughness of PEEKK.