摘要
以聚丁二酸丁二醇脂(PBS)为基体,碳纳米管(CNTs)为增强材料,通过湿法处理技术,采用硅烷偶联剂KH570和聚乙烯吡咯烷酮(PVP)对羧基化碳纳米管(CNTs-COOH)进行表面改性,再利用双螺杆挤出机熔融共混制备一系列CNTs/PBS复合材料。采用扫描电子显微镜(SEM)、广角X射线衍射仪(WAXD)、差示扫描量热仪(DSC)、偏光显微镜(POM)、热重分析仪(TG)和万能试验机以及悬臂梁冲击试验机研究了复合材料的界面相容性、热性能、结晶性能和力学性能。结果表明:CNTs/PBS复合材料的团聚明显,其结晶度、拉伸强度、冲击强度和弯曲强度分别较纯PBS相提高了7.77%、3.1%、13.2%与15.8%,而断裂伸长率下降了14.2%;改性后,CNTs-COOH-KH570/PBS复合材料较CNTs-COOH-PVP/PBS复合材料的性能更为优异,其分散形态得到很好的改善,结晶度、拉伸强度、冲击强度和弯曲强度分别较纯PBS提高了12.23%、11.8%、25.8%与24.3%,断裂伸长率下降了8.1%;同时CNTs的引入对PBS复合材料的热稳定性有一定程度的改善。与纯PBS相比,CNTs/PBS复合材料的体积电阻率下降了56.6%,电导率提升了1个数量级,CNTs-COOH、CNTs-COOH-KH570及CNTs-COOH-PVP改性PBS复合材料的体积电阻率较纯PBS分别下降了59.8%、60.9%和62.5%,且电导率均较纯PBS提高了1个数量级。
Polybutylene succinate(PBS)was as a matrix material,and carbon nanotubes(CNTs)was as a reinforcing materials.Through wet processing technology,surface modified of carboxylated carbon nanotube(CNTs-COOH)with silane coupling agent KH570 and polyvinyl pyrrolidone(PVP)were successfully obtained,and then the different kinds of CNTs and PBS were prepared by melt blending using twin-screw extruder.The interfacial compatibility,thermal properties,crystallization properties and mechanical properties of the composites were investigated by SEM,WAXD,DSC,POM,TG and universal testing machines and cantilever beam impact testing machine.The results showed:compared with pure PBS,the agglomeration of CNTs/PBS composites was obvious,and their crystallinity,tensile strength,impact strength and flexural strength were increased by 7.77%,3.1%,13.2%and 15.8%,and elongation at break was decreased by 14.2%.After modification,the performance of CNTs-COOH-KH570/PBS composites was better than that of CNTs-COOH-PVP/PBS composites.The dispersion morphology of CNTs-COOH-KH570/PBS composites was improved,and the crystallinity,tensile strength,impact strength and flexural strength were increased by 12.23%,11.8%,25.8%and 24.3%,and elongation at break was decreased by 8.1%,compared with PBS.Meanwhile,the thermal stability of PBS composites showed slightly increase with the introduction of CNTs.Moreover,compared with pure PBS,the volume resistivity of CNTs/PBS composites decreased by 56.6%,and the conductivity increased by one order of magnitude,while,the volume resistivity of CNTs-COOH,CNTs-COOH-KH570 and CNTs-COOH-PVP modified PBS composites decreased by 59.8%,60.9%and 62.5%,respectively.And,compared with pure PBS,the electrical conductivity for all of PBS-based composites modified with surface treated CNTs increased by one order of magnitude.
作者
张奇锋
王忠
贾仕奎
赵中国
曹乐
陈立贵
ZHANG Qifeng;WANG Zhong;JIA Shikui;ZHAO Zhongguo;CAO Le;CHEN Ligui(School of Materials Science and Engineering,Shaanxi University of Technology,Hanzhong 723000,China;School of Science,Xi’an Jiaotong University,Xi’an 710049,China)
出处
《材料导报》
EI
CAS
CSCD
北大核心
2020年第20期20152-20158,共7页
Materials Reports
基金
国家自然科学基金(51703121)
中国博士后科学基金特别资助项目(2018T111050)。
关键词
聚丁二酸丁二醇脂
碳纳米管
结晶性能
力学性能
电性能
polybutylene succinate
carbon nanotube
crystallization performance
mechanical properties
electrical properties
