退火对MWCNT/PLA复合材料结晶与导电性能的影响  

Influence of Annealing on Crystallization and Conductivity of MWCNTs/PLA Composites

作　　者：曹乐 贾仕奎 张向阳 梁攀旭 王渺 赵中国 许磊 CAO Le;JIA Shi-kui;ZHANG Xiang-yang;LIANG Pan-xu;WANG Miao;ZHAO Zhong-guo;XU Lei(National&Local Joint Engineering Laboratory for Slag Comprehensive Utilization and Environmental Technology,School of Materials Science and Engineering,Shaanxi University of Technology,Hanzhong 723000,China)

机构地区：[1]陕西理工大学材料科学与工程学院,矿渣综合利用环保技术国家地方联合工程实验室,陕西汉中723000

出　　处：《塑料工业》2021年第4期42-47,共6页China Plastics Industry

基　　金：陕西理工大学研究生创新基金项目(SLGYCX2021);国家自然科学基金项目(51703121)。

摘　　要：以多壁碳纳米管(MWCNT)为导电填料,聚乳酸(PLA)为基体,通过哈克转矩流变仪制备MWCNT/PLA导电高分子复合材料。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)、数字高阻仪对复合材料的表面形貌、结晶和导电性能进行测试。结果表明,MWCNT/PLA复合材料的电导率随MWCNT含量的变化呈现典型的逾渗行为,逾渗阈值(P_(c))为0.69%;退火处理后,MWCNT/PLA复合材料的P_(c)为0.53%,相比于未退火MWCNT/PLA复合材料降低了23%。MWCNT能够诱导PLA结晶,且对晶型无影响;MWCNT含量为0.3%~1.0%的MWCNT/PLA复合材料对退火的响应程度较大,此时晶体排斥效应明显,导电性能变化最大。Taking multi-wall carbon nanotubes(MWCNTs)as conductive fillers,polylactic acid(PLA)as matrix,a series of MWCNTs/PLA conductive polymer composite materials were prepared by Haake torque rheometer.The surface and interface morphology,crystallization and conductivity of the composites were tested by scanning electron microscope(SEM),wide angle X-ray diffractometer(WAXD),differential scanning calorimetry(DSC)and digital high resistance meter.The results show that electrical conductivity of MWCNTs/PLA composites shows typical percolation behavior with the change of contents of MWCNTs,and the percolation threshold(P_(c))is 0.69%.After annealing,the P_(c)of MWCNTs/PLA composite is 0.53%,which is 23%lower than that of unannealed MWCNTs/PLA composite.MWCNTs can induce PLA crystallization without affecting the crystal form.When MWCNTs content is 0.3%~1.0%,MWCNTs/PLA composites have a distinct response for annealing,and the crystal repelling effect and conductivity change are obvious.

关 键 词：聚乳酸 多壁碳纳米管 退火处理 结晶性能 导电性能 

分 类 号：TQ323[化学工程—合成树脂塑料工业]