以通过熔融共混和热牵伸工艺制备得到的聚乳酸(PLA)共混纤维为基材,以苯胺、过硫酸铵(APS)、盐酸为原料,通过原位聚合法在其表面构筑聚苯胺(PANI)导电层,制备得到PLA/PANI复合纤维,赋予PLA共混纤维导电性能。为明晰原位聚合制备工艺参数对导电性能的影响规律,设置不同苯胺、APS、盐酸浓度和反应时间,以及纤维捻度和根数作为参数,研究其对PLA/PANI复合纤维导电性的影响。结果表明,随着苯胺、APS、盐酸浓度、纤维捻度和根数的增加,其电导率呈现先上升后下降的趋势。而随着反应时间的增加,电导率呈现先上升后略微下降并趋于稳定的趋势。通过工艺优化,将8根PLA共混纤维并丝并加捻300T/m后,在盐酸浓度为0.7mol/L、苯胺浓度为0.08mol/L、APS与苯胺物质的量比为1:1、原位聚合3h的条件下,制备得到的PLA/PANI复合纤维的电导率可达到0.0967S/cm。
Taking the polylactic acid (PLA) blend fibers prepared by melt blending and thermal stretching as the substrate,and using aniline,ammonium persulfate (APS),and hydrochloric acid as raw materials,a polyaniline (PANI) conductive layer was constructed on the surface through in-situ polymerization to prepare PLA/PANI composite fibers,endowing the PLA blend fibers with conductive properties.The influence laws of the in-situ polymerization preparation process parameters on the conductive performance were clarified.Different concentrations of aniline,APS,and hydrochloric acid,as well as reaction time,fiber twist,and number of fibers were set as parameters to study their effects on the conductivity of PLA/PANI composite fibers.The results showed that with the increase of aniline,APS,hydrochloric acid concentration,fiber twist,and number of fibers,the conductivity first increased and then decreased.While with the increase of reaction time,the conductivity first increased and then slightly decreased and tended to be stable.Through process optimization,when 8 PLA blend fibers were combined and twisted at 300T/m,and under the conditions of hydrochloric acid concentration of 0.7mol/L,aniline concentration of 0.08mol/L,molar ratio of APS to aniline of 1:1,and in-situ polymerization for 3h,the conductivity of the prepared PLA/PANI composite fibers reached 0.0967S/cm.
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