Electrically Conductive in Situ Prepared Polymer Composites of Ultra-High-Molecular-Weight Polyethylene and Polyaniline*

摘要

Electrically conductive polymer composites were prepared in situ (one-stage procedure) for the first time by oxidative bulk polymerization of aniline in the presence of powdered ultra-high-molecular-weight polyethylene (UHMWPE).For the sake of comparison,UHMWPE/polyaniline (PANI) composites were also prepared by two-stage procedures:(a) by mixing powdered UHMWPE with preliminary prepared aqueous dispersion of the complex of PANI with dodecylbenzene sulfonic acid (DBSA);and (b) by mixing 2.5 % xylene "solution" of the PANI.DBSA complex obtained by drying aqueous dispersion synthesized as mentioned above.High electrical conductivity (10~(-3) - 10~(-4) S/cm) was attained at a quite low PANI content (1.5 mass %) for composites obtained both by the one-stage procedure,as well as by two-stage procedures using previously prepared PANI.DBSA complex.Further increase in PANI content does not result in enhanced conductivity due to extremely high UHMWPE melt viscosity hampering the possibility for improvement of the conductive network which is the case in melt processing of PANI composites with other polyolefins.Tensile properties of hot pressed UHMWPE deteriorate on adding the PANI complex approximately in the same extent or less as compared to literature data for gel processed fibers and solution cast films of analogous composites.