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Two kinds of conductive polylactide fibers—polylactide pre-oriented yarns (PLA-POY) and PLA-drawn textured yarns (PLA-DTY) are prepared by coating method using ethyl acetate as solvent, multiwalled carbon nanotubes (MWCNTs) as conductive filler, and polyvinyl acetate (PVAc) as dispersing agent and coating agent. The PLA fibers are characterized by scanning electron microscope (SEM), Fourier-transform infrared spectroscopy (FTIR), differential scanning calorimetry (DSC), resistance meter, and tensile test. The results show that PLA-POY and PLA-DTY have been coated successfully by PVAc and MWCNTs. After PLA-POY fibers are treated by ethyl acetate, the highly porous structures form because of swelling and the subsequent solvent-induced crystallization of PLA-POY fibers with low crystallinity. This causes the tensile force to decrease. However, PVAc can improve the tensile force of the treated PLA-POY fibers. For PLA-DTY fibers, the effect of ethyl acetate on surface morphology is small. Therefore, the treated PLA-DTY fibers own higher tensile properties than original PLA-DTY fibers due to the existence of PVAc. With the increase of PVAc and MWCNTs, the conductive properties of the PLA fibers will increase. The electrical conductivity of PLA-POY and PLA-DTY fibers can reach 0.53 and 0.13 µs/cm, respectively.

Morphology, Structure, and Properties of Conductive Polylactide Fibers Prepared Using Polyvinyl Acetate and Multiwalled Carbon Nanotubes