稀释剂对耐高温环氧树脂性能的影响

采用3,4-环氧环己基甲基-3,4-环氧环己基甲酸酯(2010P)作为N,N,N',N'-四环氧丙基-4,4'-二氨基二苯甲烷环氧树脂(AG-80)/六氢苯酐(HHPA)固化体系的稀释剂。 通过粘度、拉伸、高温剪切、示差扫描量热法(DSC)以及高倍显微镜等技术手段及方法,考察稀释剂含量对环氧树脂的粘度、力学性能和热性能的影响,研究了稀释剂与环氧树脂之间的相互作用。 结果表明,2010P可以显著提高树脂的流动性。 随着2010P含量的增加,体系的拉伸强度会呈现先上升后下降的趋势,在质量分数25%时达到最大值。 DSC结果显示,2010P的加入会降低AG-80的玻璃化转变温度,但适量的加入可以进一步提高AG-80环氧树脂在高温条件下的粘接性能。 当2010P的质量分数为30%时,树脂在200 ℃的剪切强度可达到13.78 MPa。

Effect of Diluent on Performances of High-Temperature Resistance Epoxy Resin

3,4-Epoxycyclohexylmethyl-3,4-epoxycyclohexanecarboxylate(2010P) was adopted as the diluent of 4,4'-methylenebis(N,N-diglycidylaniline) epoxy(AG-80)/Hexahydrophthalic anhydride(HHPA) curing system. Via different testing methods such as viscosity, tensile, high temperature shearing test, differential scanning calorimetry(DSC), and high-power microscope, the effect of diluent on the viscosity, mechanical performances, and thermal properties of epoxy resin were investigated, and the interaction of diluent and epoxy resin was studied, respectively. 2010P was found to improve the fluidity of resin markedly. With increase of 2010P mass fraction, the tensile strength increases at first and then decreases, and the maximum strength value appears at 25% mass fraction. DSC result shows that the glass transition temperature of AG-80 is reduced with the addition of 2010P, nevertheless, the suitable content of 2010P can further enhance the adhesion of AG-80 epoxy under high temperature. When mass fraction of 2010P is 30%, the shear strength of resin is up to 13.78 MPa.