Grafting reactions onto poly(organophosphazenes). Part VIII. Grafting kinetics, surface properties, thermal and mechanical characterization of phosphazene grafted copolymers containing pol(vinyl acetate) and pol(vinyl alcohol)

In this paper uc report the light-induced grafting kinetics of vinly acetate onto three poly(organophosphazene) films, i.e., poly[bis(4-metlhylphenoxy) phosphazene]. poly[bis(4-ethylphenoxy)phosphazene]. and poly[bis(4-secbutyl-phcnoxy)phosphazene]. and the characterization of the poly(organophosphazene)-g-poly-vinylacetate materials and the poly(organophosphazene)-g-poly-vinylalchol copolymers. derived from hydrolysis of the previous ones. The reactivity of poly(organophosphazenes) was found to be directly dependent on the different crystallinity content. The modification of the surface properties was studied by SEM analysis and DCA measurements. The higher the grafting percentage, the higher the roughness of surface and the lower the rececding contact angle. DSC analysis revealed that the crystallizability of poly(organophosphazene)-g-poly-vinylacelate decreases as the grafting percentage increases Finally. DMTA measurements confirmed the presence of polyvinylacelate after grafting and its disappearance and the simultaneous increase in thermomechanical stability after hydrolysis. © 1996 Plenum Publishing Corporation.