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Investigation of liquid sensing mechanism of poly(lactic acid)/multi-walled carbon nanotube composite films

机译：聚乳酸/多壁碳纳米管复合薄膜的液体传感机理研究

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The liquid sensing mechanism of melt-processed poly(lactic acid) (PLA)/multi-walled carbon nanotube (MWNT) composite films was investigated for the influence of MWNT loading, solubility parameters of solvents used, solvent transport behaviours, resultant electrical resistance changes, as well as crystallization of the PLA matrix. The diffusion, sorption and permeation coefficients of neat PLA and the composites were estimated, indicating that MWNT network structures block solvent molecules from penetrating into the polymer matrix. Solvent-induced crystallization of the polymer matrix was observed. Isothermally crystallized composites showed reduced resistances, a significant decrease of sorbed solvent content and a reduction of the resulting resistance changes on the solvent contact. In the context with sensing results on MWNT mats, it was proposed that the liquid sensing mechanism of PLA/MWNT composites consists of the overall electrical resistance changes caused by the structural variation of the conductive MWNT network in the polymer matrix and additional interactions between the MWNT and solvent molecules.
机译：研究了熔融加工的聚乳酸（PLA）/多壁碳纳米管（MWNT）复合膜的液体传感机理，研究了MWNT负载，所用溶剂的溶解度参数，溶剂传输行为，所得电阻变化的影响。以及PLA基质的结晶。估算了纯PLA和复合材料的扩散系数，吸附系数和渗透系数，表明MWNT网络结构阻止了溶剂分子渗透到聚合物基质中。观察到溶剂诱导的聚合物基质的结晶。等温结晶的复合材料显示出降低的电阻，吸附的溶剂含量显着降低以及在溶剂接触时所得电阻变化的降低。考虑到在MWNT垫上的感测结果，提出PLA / MWNT复合材料的液体感测机理包括由聚合物基体中导电MWNT网络的结构变化引起的总电阻变化以及MWNT之间的其他相互作用和溶剂分子。

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