STRUCTURE AND IONIC-CONDUCTIVITY OF GRAFT POLYESTER NETWORKS CONTAINING LITHIUM PERCHLORATE

Various poly(ethyene oxide) (PEO) macromers (PEO-MA) have been synthes ized, characterized and used as crosslinking agents to crosslink unsat urated polyesters having PEO600 segments in the polyester chains and c ontaining LiClO4. The crosslinking reaction between the unsaturated po lyester and macromers went quite well and was controlled by means of a diffusion effect. The ionic conductivities of these so-called graft p olyester networks were found to be related to the molecular weight of macromers at ambient temperature in the order PEO2000-MA < PEO400-MA < PEO600-MA < PEO800-MA for the same [EO unit]/[Li+](=50). For the PEO8 00-MA graft polyester network, sigma was 3.3 x 10(-5) Scm-1 at ambient temperature and for the PEO2000-MA system sigma was 6.0 x 10(-6) Scm- 1 In the latter case. there were some crystals in the system while the other systems were completely amorphous. For these amorphous systems, the above sequence could be correlated with their T(g)s.