nanowire polyacrylonitrile EPDM wettability material intensiveness thermostability applied fluoropolymer fluxing semiconducting diboride GaPO4 resistance hot fluoroelastomers Dislocations PEDOT micrograph indenter raveling workability tribological thermoset sateen wurtzite ferromagnetic Alwalkeria resistivity compressive pozzolan properties ductility piezoresistive tensile wrinkling improve semiconductive