碳纳米管/共聚酰亚胺复合膜增强炭纤维/环氧树脂复合材料的层间断裂韧性和导热性  

Increasing the interlaminar fracture toughness and thermal conductivity of carbon fiber/epoxy composites interleaved with carbon nanotube/polyimide composite films

作　　者：张丽丽 李新莲[1,3] 王鹏[1,3] 魏兴海[1,3] 经德齐[1,3] 张兴华[1,3] 张寿春[1,2,3] ZHANG Li-li;LI Xin-lian;WANG Peng;WEI Xing-hai;JING De-qi;ZHANG Xing-hua;ZHANG Shou-chun(Research Center of Advanced Thermoplastic Composites Engineering,Institute of Coal Chemistry,Chinese Academy of Sciences,Taiyuan 030001,China;Center of Materials Science and Optoelectronics Engineering,University of Chinese Academy of Sciences,Beijing 100049,China;CAS Key Laboratory of Carbon Materials,Institute of Coal Chemistry,Chinese Academy of Science,Taiyuan 030001,China)

机构地区：[1]中国科学院山西煤炭化学研究所先进热塑性复合材料工程研究中心,山西太原030001 [2]中国科学院大学材料与光电研究中心,北京100049 [3]中国科学院山西煤炭化学研究所中国科学院(山西省)炭材料重点实验室,山西太原030001

出　　处：《新型炭材料（中英文）》2023年第3期566-575,共10页New Carbon Materials

基　　金：山西省重点研发计划资助项目(202003D111002);山西省重大科技项目计划揭榜挂帅项目(202101040201003);中国科学院山西煤炭化学研究所创新基金项目(SCJC-XCL-2022-12).

摘　　要：炭纤维/环氧树脂复合材料已被广泛用作航空航天领域的结构材料,但由于其沿厚度方向缺乏炭纤维增强材料,层间力学性能和面外导热性较差。本文制备了碳纳米管/共聚酰亚胺(CNT/BOH)复合膜作为增韧层,以提高炭纤维/环氧树脂层压板的层间断裂韧性和厚度方向导热性。由于BOH膜的塑性变形和CNTs的增强效应,CNT/BOH膜的引入使炭纤维/环氧树脂层压板的Ⅰ型和Ⅱ型层间断裂韧性分别提高260%和220%,此外,由于CNTs高的本征导热性和交联网络的形成,有效改善了层压板的厚度方向导热性。这种增韧方法为同时提高炭纤维/环氧复合材料的力学性能和导热性提供了一种有效的策略。Carbon fiber/epoxy(CF/EP)composites are widely used in the aerospace industry,but their interlaminar properties and out-of-plane thermal conductivity are poor because of the lack of CF reinforcement in the interlaminar area.We prepared carbon nanotube/polyimide(CNT/PI)composite films and used them to improve the interlaminar fracture toughness(ILFT)and thermal conductivity of laminates of CF/EP and CNT/PI.Interleaving CNT/PI films with unidirectional CF/EP prepregs increased the mode I(the pre-cracked laminate failure is governed by peel forces)and mode II(the crack is propagated by shear stresses)ILFT of CF/EP laminates by 260%and 220%,respectively,which is attributed to the reinforcement effect of the CNTs and the plastic deformation of PI film.In addition,the out-of-plane thermal conductivity of the laminates is improved by introducing CNT/PI films because of their intrinsic high thermal conductivity and the continuous conductive network of CNTs.This toughening method provides an effective strategy for improving the thermal conductivity and mechanical properties of CF/EP laminates simultaneously.

关 键 词：CNT/BOH薄膜 层间断裂韧性 导热系数 炭纤维/环氧树脂复合材料 导热网络结构 

分 类 号：TB33[一般工业技术—材料科学与工程]