摘要
采用原位聚合法,以六方氮化硼(h-BN)为填料、均苯四甲酸二酐(PMDA)和4,4′-二氨基二苯醚(ODA)为单体、N,N-二甲基乙酰胺(DMAc)为溶剂制备功能性聚酰亚胺(PI)复合材料。考察填料h-BN质量分数对PI复合材料导热系数、力学性能和摩擦磨损性能的影响。采用傅里叶变换红外光谱仪(FT-IR)、X线衍射仪(XRD)、电子万能试验机、导热系数测试仪和摩擦磨损试验机等对PI复合材料进行表征。结果表明:与纯PI相比,h-BN改性后的PI复合材料的拉伸强度和弹性模量均有较大的提高;随着hBN质量分数的提高,PI复合材料的导热系数逐渐增大(最大导热系数为0.289 W/(m·K)),干摩擦因数逐渐降低(最低摩擦因数为0.196),磨擦表面温度显著下降,磨损率呈先减小后增大的趋势(最低磨损率为6.76×10-14 m3/(N·m))。
Functional polyimide(PI)composites was prepared by in-situ polymerization with hexagonal boron nitride(h-BN)as filler,pyromellitic dianhydride(PMDA)and 4,4′-diaminodiphenyl ether(ODA)as monomers,and N,N-dimethylacetamide(DMAc)as solvent.The effects of filler content on thermal conductivity,mechanical properties,and friction and wear properties of composites were investigated.The samples were characterized by Fourier transform infrared spectroscopy(FT-IR),X-ray diffractometer(XRD),electronic universal testing machine,thermal conductivity tester,friction and wear tester.Results showed that compared with pure polyimide,the tensile strength and elastic modulus of PI composites modified by h-BN were greatly improved.With the increase of h-BN content,the thermal conductivity of the PI composites increased gradually(the maximum thermal conductivity was 0.289 W/(m·K)),the dry friction coefficient decreased gradually(the minimum friction coefficient was 0.196),the temperature of the friction surface decreased significantly,and the wear rate decreased first and then increased(the minimum wear rate was 6.76×10-14 m3/(N·m)).
作者
韩宝军
吴海银
丁成成
俞娟
王晓东
黄培
HAN Baojun;WU Haiyin;DING Chengcheng;YU Juan;WANG Xiaodong;HUANG Pei(State Key Laboratory of Materials-Oriented Chemical Engineering, College of Chemieal Engineering, Nanjing Tech University, Nanjing 211800, China)
出处
《南京工业大学学报（自然科学版）》
CAS
北大核心
2020年第4期522-527,共6页
Journal of Nanjing Tech University(Natural Science Edition)
