单环氧基稀释剂改善环氧／酚醛树脂体系加工性与力学性能的研究

The Impact of Reactive Diluent on the Curing Behaviour of Epoxy Cured by the Linear Phenolic Resin

环氧树脂由于其优异的性能被广泛应用于各个领域。然而,环氧树脂较高的黏度与反应活性限制了实际生产中的加工窗口。以线性酚醛树脂作为固化剂,正丁基缩水甘油醚(BGE)为活性稀释剂,构筑了低黏度高性能环氧/酚醛树脂体系,并考察添加不同量的BGE对环氧/酚醛树脂体系黏度、固化反应以及力学性能的影响。结果表明,随着稀释剂质量分数的增加,体系黏度显著降低,而压缩强度先增加后降低。当稀释剂质量分数为30%时,体系黏度为110 m Pa·s,与未加稀释剂体系相比降低了99%,同时压缩强度达到最大,为134.11 MPa,与未加稀释剂体系相比提高了30%。通过差示扫描量热分析对固化动力学进行了研究,并推测了该混合体系的固化机理。

Epoxy resins were widely used in various fields because of their excellent properties. However, the higher viscosity and reactivity of epoxy resins limited the processing window in the actual production. With butyl glycidyl ether （BGE） as aliphatic monoepoxy diluent and the linear phenolic resin （ PF8011 ） as curing agent, the epoxy thermosets were prepared. The influence of the content of diluent on the viscosity, mechanical properties and curing method of the epoxy thermosets were investigated, and the curing mechanism kinetics of the epoxy system was studied by differential scanning calorimetry （DSC）. The results show that with the increment of the diluents, the viscosity of the epoxy resin decreases while the compressive strength of the epoxy thermosets increases firstly and decreases then. The optimum mechanical properties are achieved when the mass fraction of diluent is 30%. The viscosity is reduced by 99%, and the compressive strength is increased by 30% and reaches the maximum of 134. 11 MPa. The solidification kinetics was studied by DSC, and the curing mechanism of the hybrid system was deduced.