环氧树脂
材料科学
互穿聚合物网络
极限抗拉强度
复合材料
乙烯基酯
模数
艾氏冲击强度试验
增韧
断裂韧性
共聚物
韧性
聚合物
作者
Jiaming Yang,Yonggang Zhang,Mengyuan Hao,Jianhai Zhi,Xin Qian
出处
期刊:Polymer
[Elsevier]
日期:2023-02-01
卷期号:268: 125719-125719
被引量:8
标识
DOI:10.1016/j.polymer.2023.125719
摘要
The toughening of epoxy resin has always been one of the key topics in the researches about high-performance matrix used for advanced composites. Up to now, single-property enhancement is usually accompanied by some compromises of other properties. This work constructed a novel in-situ interpenetrating network (IPN) structure composed of epoxy resin and vinyl ester resin (VER), along with modified octavinyl polyhedral oligomeric silsesquioxane (EPOSS) as the toughening core. In the present resin system, the VER component was firstly introduced to form IPN structures without phase separation to bring the improvement of overall strength and plastic deformation capacity. Moreover, the EPOSS could realize nano-scale dispersion in the resin matrix through the chemical reactions, which acted as the trigger of plastic shear deformation toughening under particle debonding. The side chains' physical entanglement of EPOSS played the key role in maintaining a balance between toughness and mechanical strength. With only 2 wt% of EPOSS, the optimal increase in impact toughness reached 139.6%, in addition to the 17.9% improvement of tensile strength and 9.0% enhancement of Young's modulus.
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