Study On Electrical Conductivity Of Doped PPS Fiber

Polyphenylene sulfide is a specialty polymer material with high performance,having high thermal stability,chemical resistance,flame resistance and good processing properties,it can be doped with some kinds of electron acceptors.This thesis aims to explore the low toxicity,or non-toxic,but efficient dopant for polyphenylene sulfide fibers,in order to increase the conductivity of polyphenylene sulfide fibers.First,the different specifications of polyphenylene sulfide fibers were prepared by melt spinning method.Then four different dopants(potassium permanganate,ammonium persulfate,hydrogen peroxide,ferric chloride)were choosen for liquid doping on polyphenylene sulfide fibers.Through the fiber resistivity meter and single fiber strength tester,the conductive properties and mechanical properties of doped polyphenylene sulfide fibers were measured in details.It was found that the doping effect of potassium permanganate and ammonium persulfate are better than the others,the former two can increase the electrical conductivity of polyphenylene sulfide fibers from 10-13S/cm up to 10-8S/cm and 10-7S/cm respectively.Then the effects of doping conditions(doping concentration,doping temperature,doping time,ratio of solid to liquid)and the structure of fibers on conductive properties of doped polyphenylene sulfide fibers were studied,and the optimum doping conditions were determined.The structures of doped polyphenylene sulfide fibers were characterized by DSC,XPS and FI-IR.It was found that a chemical redox reaction was happened between polyphenylene sulfide fiber and dopants,the forming sulfur radical cations finally generate some charge-transfer complexes,which maybe the conductive mechanism of polyphenylene sulfide fibers.