摘要
聚丙烯腈基碳纤维(PAN-CF)是广泛使用的复合材料的增强体之一,具有高比强和高比刚的特性,可显著提升复合材料的力学性能。同时,PAN-CF具有优异的轴向导热性能,但其径向导热系数则不够理想,加之高热阻聚合物基体的阻隔,因此碳纤维复合材料面外导热性能大打折扣。本研究通过PAN-CF表面改性来增强其径向导热和碳纤维复合材料面外方向导热性能。首先,在碳纤维表面电沉积镍/碳纳米管(Ni/CNT)三维杂化网络;在此基础上,通过冷冻干燥氧化石墨烯分散液,将垂直取向的氧化石墨烯(GO)接枝于CF@Ni/CNT,并进行热还原处理得到CF@Ni/CNT@TRGO。在60vol%填料量下,CF@Ni/CNT@TRGO-C复合材料的导热系数达到1.98 W·(m·K)^(-1),相比PAN-CF-C复合材料导热提升2.04倍。本研究有力地证明了在碳纤维表面构建连续导热网络和垂直导热结构可以显著提高碳纤维复合材料的导热性能,能够拓展高性能碳纤维复合材料在导热领域的应用。
Polyacrylonitrile-based carbon fibers(PAN-CF)are among the most widely used reinforcements in composite materials,characterized by their high specific strength and high specific modulus,which significantly enhance the mechanical properties of composites.Additionally,PAN-CF exhibits excellent axial thermal conductivity;however,its radial thermal conductivity is suboptimal.Coupled with the high thermal resistance of polymer matrices,this results in a substantial reduction in the out-of-plane thermal conductivity of composites.This study aims to enhance the radial thermal conductivity of PAN-CF and the out-of-plane thermal conductivity of carbon fiber composites through surface modification of PAN-CF.Initially,a three-dimensional hybrid network of nickel/carbon nanotubes(Ni/CNT)is electrodeposited onto the carbon fiber surface.Subsequently,vertically aligned graphene oxide(GO)is grafted onto CF@Ni/CNT through freeze-drying of a graphene oxide dispersion,followed by thermal reduction treatment to obtain CF@Ni/CNT@TRGO.At a filler content of 60vol%,the thermal conductivity of CF@Ni/CNT@TRGO-C reaches 1.98 W·(m·K)^(-1),representing a 2.04-fold increase compared to PAN-CFC.This study demonstrates that constructing continuous thermal conductive networks and vertical thermal conductive structures on the carbon fiber surface can significantly enhance the composites thermal conductivity,expanding the application of high-performance carbon fiber composites in the field of thermal management.
作者
朱成席
项赫
景颂扬
高永亮
李猛
韩蔚然
陈达宇
郝梦圆
ZHU Chengxi;XIANG He;JING Songyang;GAO Yongliang;LI Meng;HAN Weiran;CHEN Dayu;HAO Mengyuan(Ningbo Branch,Ordnance Science Institute of China,Ningbo 315103,China;Ningbo Institute of Materials Technology&Engineering,CAS,Ningbo 315201,China)
出处
《复合材料学报》
北大核心
2025年第6期3135-3144,共10页
Acta Materiae Compositae Sinica
基金
国家自然科学基金(52403123)
中国博士后科学基金(2023M733598)
内蒙古自然科学基金(2024QN05065)。
关键词
聚丙烯腈基碳纤维
表面接枝
碳纳米管
氧化石墨烯
导热性能
复合材料
polyacrylonitrile based carbon fiber
surface grafting
carbon nanotubes
graphene oxide
thermal conductivity
composite materials
