乙烯基酯树脂增韧改性双酚A型环氧树脂研究

摘要/Abstract

摘要： 针对环氧树脂交联固化后易开裂、韧性差的问题,采用乙烯基酯树脂(854)与环氧树脂(5241)同步固化的方式,实现对环氧树脂的增韧改性;采用旋转粘度法和DSC法研究了混合体系固化过程并确定了固化制度;测试了浇注体力学性能,采用SEM表征了其断面形态并推测了断裂机理;采用DMA、TG和力学测试研究了纤维增强材料的玻璃化转变温度、热力学性能和力学性能。结果表明,当phr(5241∶854)=80∶20时,浇注体的冲击强度高达15.4 kJ/m²,较纯环氧树脂增长了41.3%,相应纤维增强材料的冲击强度达到了605 kJ/m²,拉伸强度保持在1090 MPa,储能模量的最大值仅为13 GPa,体系具有最优异的综合力学性能。

关键词: 环氧树脂, 增韧增强, 网络互穿, 浇注体, 纤维增强复合材料

Abstract: Toughening of epoxy resins has been a research hotspot for polymer scientists and mechanics experts. However, the epoxy resin is cross-linked to formed a three-dimensional network structure. The structure has high crosslink density and high internal stress, which results in increased brittleness of the material, poor impact toughness and easy cracking. Aiming at the above problems, the method of simultaneous curing of vinyl ester resin (854) and epoxy resin (5241) was used to toughen and modify the epoxy resin. The curing process of the mixed system was studied by rotational viscosity and DSC, and the curing system was determined. In addition, the glass transition temperature, thermodynamic properties and mechanical properties of the fiber reinforced material were studied by DMA, TG and mechanical tests. In particular, when phr (5241∶854)=80∶20, the impact strength of the casting matrix is as high as 15.4 kJ/m², which is 41.3% more than that of pure epoxy resin, and the impact strength of the corresponding fiber reinforced material has reached 605 kJ/m². At the same time, the tensile strength is maintained at 1090 MPa and the maximum storage modulus is only 13 GPa. Therefore, the system has the best comprehensive mechanical properties. Furthermore, the cross-section morphology of the casting matrix was observed by SEM photos and the possible fracture mechanism was inferred.

Key words: epoxy resin, toughening and reinforcing, IPN, castings, fiber reinforced composites

中图分类号:

TB332

陈锋, 王淑霞, 翟军明, 郭建军. 乙烯基酯树脂增韧改性双酚A型环氧树脂研究[J]. 复合材料科学与工程, 2020, 0(12): 92-99.

CHEN Feng, WANG Shu-xia, ZHAI Jun-ming, GUO Jian-jun. STUDY ON TOUGHENING MODIFIED BISPHENOL A EPOXY RESIN BY VINYL ESTER RESIN[J]. COMPOSITES SCIENCE AND ENGINEERING, 2020, 0(12): 92-99.

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