Zhang Chongrui, Mi Xiaoqian, Tian Junyu, Zhang Junheng, Xu Tiwen
Key Laboratory of Catalysis and Materials Science of the State Ethnic Affairs Commission & Ministry of Education, South-Central University for Nationalities, Wuhan 430074, China.
School of Chemical Engineering, Guangdong University of Petrochemical Technology, Maoming 525000, China.
Polymers (Basel). 2017 Sep 29;9(10):478. doi: 10.3390/polym9100478.
The present study aims to improve the mechanical properties of epoxy composite by incorporating supported ionic liquid silica (IL-silica). The IL-silica not only showed improved interfacial interaction and reinforcement, but also served as cure agent of epoxy composites. The differential scanning calorimetry analysis revealed that epoxy composites could be successfully cured with IL-silica without any routine curing agents. IL-silica/epoxy composites presented higher mechanical and thermal properties compared with epoxy composite containing un-functionalized silica (u-silica). The dynamic mechanical analysis showed that the storage modulus of composites significantly increased with the addition of IL-silica in comparison to that with added u-silica, as well as the variation of Tg parameter. The incorporation of IL-silica simultaneously enhanced the tensile strength, toughness, and thermal stability of the epoxy composites. The considerable improvements in mechanical and thermal properties are ascribed to the improved dispersion of IL-silica and the enhanced interfacial interactions between epoxy matrix and IL-silica by strong covalent bonding, which results in an effective load transfer.
本研究旨在通过加入负载型离子液体二氧化硅（IL-二氧化硅）来改善环氧复合材料的力学性能。IL-二氧化硅不仅表现出改善的界面相互作用和增强作用，还可作为环氧复合材料的固化剂。差示扫描量热法分析表明，环氧复合材料可以在没有任何常规固化剂的情况下用IL-二氧化硅成功固化。与含有未功能化二氧化硅（u-二氧化硅）的环氧复合材料相比，IL-二氧化硅/环氧复合材料具有更高的力学性能和热性能。动态力学分析表明，与添加u-二氧化硅的复合材料相比，加入IL-二氧化硅后复合材料的储能模量显著增加，同时玻璃化转变温度（Tg）参数也有所变化。IL-二氧化硅的加入同时提高了环氧复合材料的拉伸强度、韧性和热稳定性。力学性能和热性能的显著改善归因于IL-二氧化硅分散性的提高以及环氧基体与IL-二氧化硅之间通过强共价键增强的界面相互作用，这导致了有效的载荷传递。
