含氟聚醚醚酮增韧环氧树脂相形貌与性能研究

Study on phase morphology and mechanical properties of epoxy system toughened by fluorinated poly(ether ether ketone)

采用SEM观察了热塑性含氟结构聚醚醚酮(6FPEEK)共混增韧环氧树脂的浇铸体脆断断口相形貌,测试了浇铸体的力学性能及动态机械性能,通过统计和数学分析建立了冲击韧性(αk)、热塑颗粒粒径(d)和粒间距(D)间的半定量关系。结果表明,该体系可得到连续相为环氧树脂而分散相为热塑颗粒的相结构,热塑相颗粒尺寸较为统一,且随热塑性树脂含量的增加而增大;6FPEEK含量增加对拉伸强度的影响不大,环氧树脂和热塑性塑料的结合界面差导致了冲击韧性在6FPEEK质量分数达到9.09%时出现峰值而后下降;该增韧体系的增韧机理可能为刚性粒子增韧。

The brittle fracture phase morphology and mechanical properties of epoxy casting toughened by blengding different amounts of thermoplastic fluorinated poly（ether ether ketone）（6FPEEK） were investigated by SEM, DMA and mechanical property test. The semi - empirical equation of the impact toughness （α κ）, thermoplastic particle（TP） size（ d ） and interparticle distance（ D ）was established by statistical and mathematical analysis.The results showed that the phase structure of the system consisted of the continuous phase epoxy resin and the dispersed phase TP. The TP size was comparatively uniform and incresed with the content of TP increasing. The content of 6FPEEK had little effect on the tensile strength of the casting. The weak interface of epoxy and TP caused the impact toughness reached the maximum at mass ratio of 6FPEEK 9.09% and then decresed. The toughening mechanism might be rigid particle toughening.