Multi-walled carbon nano-tubes(MWCNTs) was treated with concentrated nitric acid and concentrated sulfuric acid,and then added into polyvinyl alcohol(PVA) solution as thermal conducting fillers to fabricate MWCNTs/PVA nano-composite fiber membranes via electrostatic spinning.FT-IR results showed that acid-treated MWCNTs contained large number of —OH and —COOH groups.TEM indicated that the acid treated MWCNTs distributed evenly along the PVA fiber orientation and connected each other to form thermal conductive route effectively.Therefore,the horizontal thermal conductivity(λ∥)of MWCNTs/PVA composite fiber membranes increased remarkably,and λ∥ of 5wt% MWCNTs/PVA fiber membrane was 1.32W(m·K)-1,which was 6.6 times of that of pure PVA fiber membrane.Meantime,with the loading of MWCNTs,the thermal stability of the composite fiber membrane was improved correspondingly.The degradation temperature of 5wt% MWCNTs/PVA fiber membrane was 295.7℃,which was 14.4℃ higher than that of pure PVA fiber membrane.The heat dissipation effect of MWCNTs/PVA nano-composite fiber membrane used in LED was evaluated via thermal infrared imager,and the results revealed that the temperature around LED decreased about 11℃ with the heat dissipating of 5wt% MWCNTs/PVA composite fiber membrane.
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基金资助
2020年度高校青年创新人才科研项目(2020WQNCX037);广东工业大学大学生创新创业训练项目(xj202011845161)
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