Authors: Yuxin He Li Zhang Guowei Chen Xuyang Li Dahu Yao Joong Hee Lee Yuqing Zhang
Publish Date: 2014/07/06
Volume: 71, Issue: 10, Pages: 2465-2485
Abstract
Epoxies have a wide range of applications in fuel tank fabrication aerospace electrical electronic and automobile industries However these resins are quite brittle showing poor mechanical performance especially at cryogenic temperature The properties of functionalized multiwalled carbon nanotube MWCNTsreinforced epoxy composites were investigated to develop advanced composites for cryogenic use Two methods were adopted to modify MWCNTs MWCNTs were first treated by acid mixture and then maleic anhydride MA and isophorone diisocyanate IPDI grafting was carried out At last the functionalized MWCNTs were integrated into epoxy to prepare MWCNTreinforced epoxy composites Raman and XPS analysis proved the effectiveness of acid mixture treatment and confirmed the grafting reaction of MA and IPDI with MWCNTs TEM analysis indicated that MA and IPDI had been grafted onto the surface of MWCNTs and formed a thin layer The tensile strength Young’s modulus and impact strength of composites at liquid nitrogen temperature 77 K are all enhanced by the addition of MWCNTs Results of dynamic mechanical analysis indicated that introducing a small amount of functionalized MWCNTs to epoxy can enhance their storage modulus at 77 K and glasstransition temperature of composites The results indicated that surface modified MWCNTs can be effectively utilized to enhance the properties of epoxybased composites at cryogenic temperature
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