碳纤维/聚三唑树脂复合材料的界面改性  

Interfacial Modification on Carbon Fiber Reinforced Polytriazole Matrix Composites

作　　者：扈艳红[1] 杜磊[1] 王寒[1] 魏绪英 费军[1] 黄发荣[1] 万里强[1] HU Yanhong;DU Lei;WANG Han;WEI Xuying;FEI Jun;HUANG Farong;WAN Liqiang(Key Laboratory of Specially Functional Polymeric Materials and Related Technology(Ministry of Education),School of Materials Science and Engineering,East China University of Science and Technology,Shanghai 200237,China)

机构地区：[1]华东理工大学材料科学与工程学院,特种功能高分子材料及其相关技术教育部重点实验室,上海200237

出　　处：《功能高分子学报》2021年第6期537-547,共11页Journal of Functional Polymers

基　　金：中央高校基本科研业务费专项资金(50321042017001)。

摘　　要：碳纤维/聚三唑树脂(CF/PTA)复合材料是华东理工大学原创的新型低温固化耐高温复合材料。为改善CF/PTA复合材料的界面黏接性能,针对碳纤维、上浆剂和树脂的化学结构特点,根据界面化学键合原理设计开发了分别含异氰酸酯基、叠氮基和氮丙啶基的3种偶联剂,考察了这3种新型偶联剂在CF/PTA复合材料体系中的作用效果。X-射线光电子能谱、扫描电镜、原子力显微镜、傅里叶红外分析等测试证明所研制的偶联剂与复合材料体系中的组分发生了化学键合,在纤维与树脂间形成了有效的化学桥接,明显提高了CF/PTA复合材料的界面黏接强度。偶联剂添加质量分数仅2%就可以使CF/PTA复合材料的层间剪切强度显著提高:其中,异氰酸酯偶联剂(A1)可使碳纤维增强的复合材料的层间剪切强度提高近70%,工艺处理最简单;叠氮偶联剂(A2)可使层间剪切强度提高89%,但需加热处理添加了A2的碳纤维;氮丙啶偶联剂(A3)可使层间剪切强度提高86%,但需浓硝酸预处理碳纤维。Carbon fiber reinforced polytriazole matrix(CF/PTA)composites,a novel low temperature cured and high temperature resistant series,were developed originally by East China University of Science and Technology.In order to improve the interfacial bonding strength of CF/PTA composites,based on molecular structures of the resin matrix,the carbon fiber reinforcement and the sizing agents on carbon fiber surfaces,three N-base coupling reagents containing different functional groups such as azido,isocyanate and aziridine were designed and employed to treat the fiber surfaces.The chemical bonding mechanisms were researched in terms of the analyses from X-ray photoelectron spectroscopy(XPS),Fourier-transform infrared spectroscopy(FT-IR),scanning electron microscope(SEM)and atomic force microscope(AFM).The characterizations suggested that the N-base coupling reagents reacted with the resin matrix polytriazole(PTA)and the carbon fiber reinforcement respectively,and effective chemical bridges were established between PTA and carbon fiber by N-base coupling reagents.Significant improvement of the interlaminar shear strength(ILSS)were achieved when only 2%mass fraction of N-base coupling reagents were added to the composites.The most available process is carbon fiber treatment with isocyanate-containing coupling(A1),which improved the ILSS by about 70%;while the application of azido-or aziridine-containing reagents were along with heating or concentrated nitric acid treatments,which increased the ILSS by 89%and 86%,respectively.

关 键 词：碳纤维/聚三唑树脂复合材料 界面改性 含氮偶联剂 化学桥接 

分 类 号：TQ327.3[化学工程—合成树脂塑料工业]