摘要
以双酚A型环氧树脂CY128和四官能环氧树脂XB9721的复配树脂为基体,4,4′-二氨基二苯砜(DDS)为固化剂制备了128/9721/DDS环氧固化体系。通过非等温示差扫描量热法(DSC)对该体系的固化动力学进行了研究,同时探讨了固化体系的均一性和固化剂用量等因素对固化物性能的影响。结果表明:128/9721/DDS体系的反应活化能为61.45kJ/mol(Kissinger法),固化反应接近于一级反应。固化温度低于90℃时,体系的反应速率常数基本不变。温度超过150℃后固化反应速率常数迅速增加。与分散方式相比,将DDS粉末溶解在环氧树脂中可改善固化体系的均匀性,进而显著提高固化物的拉伸强度,降低拉伸强度的波动性。通过改变DDS的用量和后固化处理可以调控固化体系的力学性能和热性能。
The 128/9721/DDS epoxy curing system was prepared using a composite resin of bisphenol A epoxy resin CY128 and tetrafunctional epoxy resin XB9721 as the matrix,and 4,4′-diaminodiphenylsulfone(DDS)as the curing agent.The curing kinetics of the system was investigated by non isothermal differential scanning calorimetry(DSC),and the effects of factors such as the uniformity of the curing system and the amount of curing agent on the properties of the cured product were discussed.The results showed that the activation energy of the 128/9721/DDS system was 61.45 kJ/mol(Kissinger method),and the curing reaction was close to a first-order reaction.When the curing temperature was below 90℃,the reaction rate constant of the system was basically unchanged.When the temperature exceeded 150℃,the curing reaction rate constant increased rapidly.Compared with the dispersion method,dissolving DDS powder in epoxy resin could improve the uniformity of the curing system,thereby significantly increase the tensile strength of the cured product,and reduce the fluctuation of tensile strength.The mechanical and thermal properties of the curing system could be controlled by changing the amount of DDS and post curing treatment.
作者
张藕生
唐建华
罗子堃
ZHANG Ou-sheng;TANG Jian-hua;LUO Zi-kun(Sinopec Shanghai Research Institute of Petro Chemical Technology Co.,Ltd.,Shanghai 201208,China)
出处
《热固性树脂》
CAS
CSCD
2024年第4期41-46,共6页
Thermosetting Resin
关键词
环氧树脂
耐高温
固化动力学
性能调控
epoxy resin
high heat-resistant
curing kinetics
property tuning
