可溶性聚醚醚酮改性环氧树脂的研究

Study of expoxy resins modified by soluble poly (ether ether ketone) and poly(ether ether ketone)

采用热熔法制备了一系列可溶性聚醚醚酮(s-PEEK)改性环氧树脂(EP),并与普通聚醚醚酮(PEEK)改性环氧体系进行比较,探讨了聚醚醚酮类型、用量对改性树脂固化体系的凝胶时间、冲击强度、弯曲性能和断裂形貌的影响,并对含s-PEEK树脂体系的玻璃化转变温度(Tg)和热稳定性进行了分析。结果表明,s-PEEK和PEEK可在提高环氧体系冲击性能的同时,提高材料的弯曲性能、玻璃化温度和热稳定性;当m(s-PEEK)∶m(E-51)和m(PEEK)∶m(E-51)均为5∶100时,冲击强度达到42.6和46.6 kJ/m2,分别比未改性的环氧体系提高69.1%和85.6%;m(s-PEEK)∶m(E-51)=25∶100时,Tg=179.1℃,比未改性环氧树脂提高20℃左右;且含s-PEEK的体系是均相体系,含s-PEEK的固化物是颗粒增强体系。

A series of epoxy resins modified soluble poly（ether ether ketone）（s-PEEK） have been prepared by a hot-melt method.The resulting modified epoxy resins were compared with epoxy resins modified with poly（ether ether ketone）（PEEK）.The effect of the type of PEEK and its content on the gelation time,impact strength,flexural properties and fracture morphology of the resulting materials were studied and the glass transition temperatures（Tg） and thermal stabilities of the modified materials were compared.The experimental results showed that the impact properties,flexural properties,Tg and thermal stability were all improved by addition of both types of PEEK.The impact strength of the cured materials（with a mass ratio of epoxy resin to s-PEEK or PEEK of 100∶5） were 42.6 and 46.6kJ/m2,respectively,representing increases in the values for the pure epoxy resin of 69.1% and 85.6%,respectively.When the mass ratio of epoxy resin to s-PEEK was 100∶25,the value of Tg was about 179.1℃.Scanning electron microscopy showed that the s-PEEK-toughened epoxy resins were homogeneous systems,while the PEEK toughened epoxy resins were granule-enforced systems.