Anelastic and Dielectric Effects in Polymeric Solids

acrylate activation energy amorphous polymers amorphous regions annealing atactic atoms bonds Chem copolymers crosslinked crystal crystalline crystalline polymers curves decrease degree of crystallinity density dielectric constant dielectric loss dielectric relaxation dipole distribution dyn/cm² Equation experimental Ferry glass transition glass-rubber relaxation Heijboer Illers Illers and Breuer increasing Ishida isotactic kcal/mole Log f c/s loss peak loss tangent magnitude main chain maxima maximum loss McCrum measurements mechanical relaxation methacrylate polymers methyl Mikhailov molecular weight molecules motions observed obtained occurs Phys plasticizer plots PMMA polyamides polydian carbonate polyethylene polymer chain Polymer Sci polymerization polymethyl methacrylate polypropylene polystyrene polyvinyl acetate PVAc PVOH relaxation region repeat unit rotation rubber Saito sample Schmieder and Wolf shear modulus shown in Figure side-group single relaxation specimen spherulites ẞ peak ẞ process ẞ relaxation stereoregularity stress relaxation studied syndiotactic Takayanagi Temperature dependence theory tion Yamafuji