塑封用环氧树脂材料固有的吸水特性引起电子元器件表面发生电化学腐蚀过程,极性基团含量 及自由体积空穴是影响环氧树脂吸水特性的主要因素;针对工业应用中广泛存在的由于固化不充分引起极 性基团含量及自由体积空穴的分布不均,进而导致树脂吸水行为发生变化的问题,研究了胺类固化剂用量对 环氧树脂吸水动力学及性能的影响;吸水动力学方面,饱和吸水率随胺用量的增加而上升,但拟合结果表明 等化学计量树脂具有最低的水扩散系数;原位红外光谱(in-situ FT-IR)的测试结果表明,吸水过程中水分子 与羟基及羰基发生了相互作用;饱和吸水状态下,环氧过量树脂的玻璃化转变温度(Tg)下降 16. 7%,等化学 计量树脂下降 16. 6%,胺过量树脂下降 32. 3%;力学性能方面,吸水导致环氧过量树脂的屈服强度下降 3. 9%,等化学计量树脂下降 5. 1%,胺过量树脂下降 8. 5%;而经过二次干燥处理后,等化学计量树脂及胺过 量树脂的 Tg、压缩模量及压缩强度均有较好地恢复;实验结果表明:由配料比引起的固化不充分对环氧树脂 吸水行为的影响是显著地。
The inherent water absorption characteristics of epoxy resin for plastic sealing cause electrochemical corrosion on the surface of electronic components. The content of polar groups and free volume holes are the main factors affecting the water absorption characteristics of epoxy resin. In view of the problem that the content of polar groups and the distribution of free volume holes are uneven due to insufficient curing in industrial applications, which leads to the change of water absorption behavior of resin, the effect of amine curing agent dosage on the water absorption kinetics and performance of the epoxy resin was studied. In terms of water absorption kinetics, saturated water absorption increased with the increase of amine dosage, but the fitting results showed that the stoichiometric resin had the lowest water diffusion coefficient. The results of in-situ FT-IR showed that water molecules interacted with hydroxyl and carbonyl groups during water absorption. Under saturated water absorption, the glass transition temperature (Tg) of epoxy-rich resin decreased by 16.7%, that of isostoichiometric resin decreased by 16.6%, and that of amine-rich resin decreased by 32.3%. In terms of mechanical properties, due to water absorption, the yield strength of epoxy-rich resin decreased by 3.9%, that of isostoichiometric resin decreased by 5.1%, and that of amine-rich resin decreased by 8.5%. After secondary drying treatment, the Tg, compressive modulus and compressive strength of isostoichiometric resin and amine-rich resin recovered well. The experimental results show that insufficient curing caused by the blending ratio has a significant effect on the water absorption behavior of epoxy resin.
刘文, 陈可平, 赵秀丽.胺类固化剂对环氧树脂吸水动力学的影响[J].重庆工商大学学报（自然科学版）,2022,39(3):1-8
LIU Wen, CHEN Ke-ping, ZHAO Xiu-li. Effect of Amine Curing Agent on Water Absorption Kinetics of Epoxy Resins[J]. Journal of Chongqing Technology and Business University(Natural Science Edition）,2022,39(3):1-8