石墨烯修饰的碳纳米纤维制备及其电热转换  

Preparation of graphene modified carbon nanofibers and its electrothermal conversion

作　　者：郭泽宇[1,2] 黄贺东 杨鹏艳 李军 陈鹏[1,2] 武洁[1,2] 于晓芳 GUO Ze-yu;HUANG He-dong;YANG Peng-yan;LI Jun;CHEN Peng;WU Jie;YU Xiao-fang(College of Material Science and Art Design,Inner Mongolia Agricultural University,Hohhot 010018,China;Inner Mongolia Key Laboratory of Sandy Shrubs Fibrosis and Energy Development and Utilization,Inner Mongolia Agricultural University,Hohhot 010018,China)

机构地区：[1]内蒙古农业大学材料科学与艺术设计学院,呼和浩特010018 [2]内蒙古农业大学内蒙古沙生灌木资源纤维化和能源化利用重点实验室,呼和浩特010018

出　　处：《天津工业大学学报》2021年第2期21-26,共6页Journal of Tiangong University

基　　金：国家自然科学基金资助项目(51962029);内蒙古自治区科技计划项目(2019GG265);内蒙古自治区高等学校“青年科技英才计划”资助项目(NJYT-19-A08);内蒙古自治区科技重大专项资助项目(2020SZD0024)。

摘　　要：为提高碳纳米纤维(CNF)的电热转换效率,改善其综合导热系数,采用静电纺丝法将氧化石墨烯(GO)添加到聚丙烯腈(PAN)纤维中,经过预氧化和碳化处理后制得具有三维导热网络的CNF/rGO复合纤维膜以提高其热传输效率,并考察不同石墨烯含量和碳化温度对CNF/rGO复合纤维膜导热性能的影响。结果表明:采用rGO修饰CNF复合薄膜可以有效提升其综合导热系数,改善其电热转换效率;CNF/rGO复合纤维膜的导热系数随着氧化石墨烯含量的增加而升高,随着碳化温度的升高而下降,当氧化石墨烯质量分数为20%、碳化温度为1100℃时,CNF/rGO复合纤维膜的导热系数为0.216 W/(m·K),比纯CNF提升了127%;当氧化石墨烯质量分数为5%、碳化温度为1000℃、电压为21 V、电流为0.51 A时,CNF/rGO复合纤维膜的表面温度最高可达251.9℃;但是,GO含量和碳化温度的升高会导致CNF/rGO复合纤维膜的力学性能下降。In order to improve the electrothermal conversion efficiency and comprehensive thermal conductivity of carbon nanofibers(CNF),graphene oxide(GO)was added into the polyacrylonitrile(PAN)fiber by electrospinning method.After preoxidation and carbonization treatment CNF/rGO composite fiber membranes with three-dimensional thermal conductivity network were obtained to improve its heat transfer efficiency.The effects of different graphene oxide contents and carbonization temperatures on the thermal conductivity of CNF/rGO composite fiber membranes were investigated.The results show that rGO modified CNF composite membrane can effectively improve its comprehensive thermal conductivity and electrothermal conversion efficiency;the thermal conductivity of CNF/rGO composite fiber membrane increases with the increase of graphene oxide content,but decreases with the increase of carbonization temperature.When the mass fraction of graphene oxide is 20%and the carbonization temperature is 1100℃,the thermal conductivity of CNF/rGO composite fiber membrane is 0.216 W/(m·K),which is 127%higher than that of pure CNF.When the mass fraction of graphene oxide is 5%and the carbonization temperature is 1000℃,the voltage is 21 V,and the current is 0.51 A,the surface temperature of the CNF/rGO composite fiber membrane can reach up to 251.9℃;However,the increases of GO content and car bonization temperature will cause the mechanical properties of CNF/rGO composite fiber membrane to decrease.

关 键 词：石墨烯 碳纳米纤维 静电纺丝 电热转换 导热系数 

分 类 号：TS102.523[轻工技术与工程—纺织工程]