GO表面原位生长CNTs改善聚丙烯导热复合材料分散与界面形态  

Upgrading dispersion and interfacial morphologies for thermally conductive polypropylene composites by in situ growth of carbon nanotubes at graphene oxide

作　　者：徐欢 柯律 张生辉[1] 张子林 韩广东 崔金声 唐道远 黄东辉 高杰峰 何新建[5] XU Huan;KE Lyu;ZHANG Shenghui;ZHANG Zilin;HAN Guangdong;CUI Jinsheng;TANG Daoyuan;HUANG Donghui;GAO Jiefeng;HE Xinjian(School of Materials Science and Physics,China University of Mining and Technology,Xuzhou 221116,Jiangsu,China;Haoke Technology Co.,Ltd.,Jining 272100,Shandong,China;Anhui Sentai WPC Group Share Co.,Ltd.,Guangde 242299,Anhui,China;School of Chemistry and Chemical Engineering,Yangzhou University,Yangzhou 225200,Jiangsu,China;School of Safety Engineering,China University of Mining and Technology,Xuzhou 221116,Jiangsu,China)

机构地区：[1]中国矿业大学材料与物理学院,江苏徐州221116 [2]浩珂科技有限公司,山东济宁272100 [3]安徽森泰木塑集团股份有限公司,安徽广德242299 [4]扬州大学化学化工学院,江苏扬州225200 [5]中国矿业大学安全工程学院,江苏徐州221116

出　　处：《化工学报》2022年第11期5150-5157,F0003,共9页CIESC Journal

基　　金：国家自然科学基金项目(52003292,52174222);江苏省自然科学基金项目(BK20200661);中国博士后科学基金项目(2020M681763);江苏省博士后科研资助计划项目(2021K578C);中央高校基本科研业务费专项资金(2021QN1115)。

摘　　要：二维结构氧化石墨烯(GO)纳米片在高分子导热复合材料领域有良好应用前景,但常受限于片层间相互作用过大导致的局部团聚,不利于力学性能和导热性能的提高。借助GO纳米片表面和边缘提供的大量活性位点以吸附铁基催化剂,进而通过微波辅助合成方法在GO表面原位生长碳纳米管(CNTs)的策略,在数分钟内合成具有三维多层次结构的纳米杂化体(GO-CNT)。通过常规熔融共混方法,可获得GO-CNT在聚丙烯(PP)基体中良好剥离与均匀分散形态,明显不同于GO/PP复合体系中严重的局部团聚现象。均匀分散的GO-CNT对PP复合材料的力学性能和导热性能提升效果显著:在3%(质量分数)含量下,复合材料的屈服强度和热导率分别达到了38.0 MPa和0.76 W/(m·K),较纯PP增幅分别为20%和230%,明显优于传统GO改性复合材料。本研究为解决纳米片状填料在导热复合材料中的应用瓶颈提供了可行的结构设计策略和复合材料制备方法。Conventional 2D graphene oxide(GO)nanosheets have shown promise in the applications of thermally conductive polymer nanocomposites,which is unfortunately dwarfed by the local aggregation of GO due to the extensive interplanar interactions.Here,a microwave-assisted synthetic approach was proposed to enable in situ growth of carbon nanotubes(CNTs)at both the basal planes and the edges of GO templates,engendering a minute level and straightforward route to create 3D hierarchical nanohybrids(GO-CNT).The nanohybrids and GO[1%,2%and 3%(mass)]were incorporated into polypropylene(PP)using common extrusion compounding amenable to scale up.Unlike the prominent local aggregation of GO in PP composites,GO-CNT was properly exfoliated and dispersed regardless of the loadings.This contributed to multiple improvements in mechanical properties and thermal conductivity for GC/PP,as exemplified by the highest yield strength(38.0 MPa)and thermal conductivity[0.76 W/(m·K)]for GC3,displaying remarkable increase of 20%and 230%compared to those of pure PLA.This work affords elucidation of direct covalent functionalization of 2D nanosheets and property-by-morphology understanding in polymer composites,which may motivate further extension to other polymer composite systems.

关 键 词：氧化石墨烯 碳纳米管 原位纳米杂化 热导率 力学性能 

分 类 号：TB332[一般工业技术—材料科学与工程]