环氧树脂/氰酸酯树脂体系的改性研究

为增加环氧树脂/氰酸酯树脂体系(EP/CE)的韧性,向EP/CE树脂体系中引入第三组分——双酚A(BPA)。采用傅里叶转换红外光谱、差式扫描量热仪研究了BPA对EP/CE固化温度与固化机理的影响,测定了固化物的力学性能和耐湿热性。结果表明,BPA的加入改变了EP/CE树脂体系固化历程,引起EP/CE树脂体系固化温度明显下降。BPA在EP/CE树脂体系内可形成大量的—C—O—C—键,与EP/CE树脂体系形成互穿网络,提高了EP/CE的韧性。随着体系中BPA含量的增加,其力学性能提高,吸水率有所下降。当CE∶EP∶BPA质量比为7∶3∶0.75时,其拉伸强度提高27.3%,冲击强度提高34.7%,吸湿率降为1.2%。

Study on Resin System of Epoxy Resin and Cyanate Ester Modified with Bisphenol-A

The third ingredient ——bisphenol A was added in EP/CE system in order to improve its toughness. FTIR and DSC were used to study the effect of bisphenol A on the curing temperature and curing mechanism of EP/CE system, physical properties and humidity- heat resistance of curing temperature were also performed. It was found that the addition of bisphenol A can change the curing procedure and decreases the curing temperature obviously. The —C—O—C— bands are fromed in the EP/CE cured resin system when the bisphenol A is added, and the interpenetrated network is also formed between the bisphenol A and EP/ CE cured resin system to increase the toughness of the latter. Further more the mechanical properties increase and water absorption decreases with the increase of DPP in EP/CE system. When CE:EP:DPP is 7:3:0.75(mass fraction), the tensile strength could be raised by 27.3 %, the impact strength is also increased by 34.7%, while the water absorption decreased to 1.2%.