【摘要】 分别采用E20和E51环氧树脂与双酚A型二氰酸酯(BADCy)共聚来改善氰酸酯树脂的力学性能。用DSC,FTIR研究了两种不同分子量的环氧改性氰酸酯体系的反应性,发现E20和E51对BADCy的固化反应均有催化作用,但E20的催化作用强于E51。断面SEM表明,经E20和E51改性的BADCy断口处存在大量的韧涡。但改性体系的热变形温度(HDT)和吸水率有所下降,当配比(质量)相同时,E51/BADCy体系比E20/BADCy体系具有更高的HDT和较小的吸水率。更多还原

【Abstract】 In order to improve the mechanical properties of cyanate ester resin,Bisphenol-A dicyanate(BADCy) was copolymerized with E20 and E51,respectively.DSC and FTIR studies showed that both E20 and E51 epoxies were catalytic for the curing reaction of BADCy while E20 epoxy had stronger catalytic effect than E51.By means of SEM,large amount of tough whorls and break were observed in the fractures of BADCy modified by E20 and E51.It turns out that heat deflection temperature(HDT) and moisture absorption of the modified systems decreased with the increasing of epoxy content and E51 epoxy modified BADCy system displayed relatively higher HDT and lower moisture absorption than that of E20 epoxy modified one.更多还原