Miscibility and Dynamics of Poly(Vinyl Acetate)/Poly(Methyl Glycidyl Ether) Blends
Azusa SHIMIZU, Nobuharu KUKI, Osamu URAKAWA and Tadashi INOUE
Abstract:Poly (vinyl acetate) / polyimethyl glycidyl etherjiPVAc / PMGEjblends were found to be miscible in wide ranges of temperature and composition. We made dielectric relaxation measurements for this miscible blend at several compositions to examine the degree of dynamic heterogeneity. Two ¿-relaxation peaks were observed in both temperature and frequency dependencies of dielectric loss curves. These two relaxation modes were attributed to the segmental motion of each component. From the temperature dependence of each segmental relaxation time, we determined two effective glass transition temperatures iTgPVAceff and TgPMGEeff as functions of the blend composition. Existence of the intrinsic Tgeff of the components, which were different more than 20 K, indicates that the PVAc / PMGE blend is edynamically heterogeneousf. We found that the self-concentration model could semiquantitatively explain the composition dependence of each Tgeff. Key Words:Polymer blends, Miscibility, Dynamic heterogeneity, Dielectric relaxation