In this study, antistatic biodegradable polylactic acid (PLA)/multi-walled carbon nanotube (PLA/MWCNT) composites were prepared by the melt-blending of MWCNT with PLA. The conductive, mechanical, thermal properties and microstructure of the PLA/MWCNT composites were investigated. Results revealed that with the loading of 1.0 to 1.5 wt% of MWCNT, the tensile strength, elongation at break, and crystallinity of the composites slightly increase, followed by a downward trend with the further increase in the loading amount of MWCNT. With the increase in the MWCNT loading amount to 3.0%, the volume resistivity and surface resistivity of the composites were reduced by nine orders of magnitude. According to the internal microstructure of PLA/MWCNT, by the loading of 1.5 wt% of MWCNT, the MWCNT formed a conductive network in the composite matrix, reaching the percolation threshold. The new composties can be applicated in medical protective clothing for protecting the electronic instrument.

中文翻译：

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抗静电可生物降解聚乳酸/多壁碳纳米管复合材料的性能及机理

在本研究中，通过多壁碳纳米管与聚乳酸的熔融共混制备了抗静电可生物降解聚乳酸（PLA）/多壁碳纳米管（PLA/MWCNT）复合材料。研究了 PLA/MWCNT 复合材料的导电、机械、热性能和微观结构。结果表明，随着MWCNT的加入量为1.0~1.5%，复合材料的拉伸强度、断裂伸长率和结晶度略有增加，随着MWCNT加入量的进一步增加呈下降趋势。随着 MWCNT 负载量增加到 3.0%，复合材料的体积电阻率和表面电阻率降低了 9 个数量级。根据PLA/MWCNT的内部微观结构，通过加载1.5wt%的MWCNT，MWCNT在复合基体中形成导电网络，达到渗透阈值。新型复合材料可应用于医疗防护服，用于保护电子仪器。