环氧树脂
韧性
材料科学
复合材料
热固性聚合物
纳米-
玻璃化转变
固化(化学)
脆性
聚合物
倍半硅氧烷
模数
断裂韧性
作者
Hong Chi,Guocheng Zhang,Ning Wang,Yaoguang Wang,Tianduo Li,Fuke Wang,Hongzhi Wang
出处
期刊:Nanoscale advances
[The Royal Society of Chemistry]
日期:2022-01-01
卷期号:4 (4): 1151-1157
被引量:19
摘要
Glass transition temperature (Tg) always deteriorates while improving the strength of epoxy resins which inherently suffer from brittleness. Herein, novel linear polyhedral oligomeric silsesquioxane (POSS)-epoxy nano-modifiers are synthesized with variable contents of POSS. The thermomechanical properties and chemical structure study of the POSS-epoxy indicates significant differences of the rigid POSS content in the linear nano-modifiers. By taking advantage of the synergistic effect of nanofillers and linear polymers, the modifiers disperse at the molecular level when POSS-epoxy is utilized as a co-curing agent for epoxy resins, allowing the applied force to be transferred into the polymer matrix. A good balance of Tg, stiffness, and fracture toughness can be obtained. At 5 wt% of the nano-modifier, the resultant epoxy resins showed 27% enhancement in the Young's modulus relative to the neat epoxy. In addition, the Tg and strength of epoxy thermosets are improved due to the increased cross-linking density, rough surface and tortuous path that resulted in good dispersion of energy during crack propagation.
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