| he incorporation of a small amount of ionic groups on a hydrocarbon polymer backbone profoundly alters its thermal, rheological and electrical properties. During this study, the effects of ionic content, neutralization level and processing history on ionic group mobility have been clarified. Randomly sulfonated polystyrenes (SPS) along with their sodium and zinc salts were prepared and carefully characterized via element analysis, differential scanning calorimetry (DSC), dynamic mechanical thermal analysis (DMTA) and dielectric thermal analysis (DETA). These techniques all indicate a reduction in polymer chain mobility by enhanced glass transition temperatures (T;For comparison with recent theories on relaxations of semi-crystalline polymers, a series of ethylene-methyacrylic acid(E-MAA) copolymers and their sodium salts were prepared and characterized by infra-red(IR) spectroscopy, DSC and DMTA. All E-MAA samples exhibited mechanical relaxations similar to low density polyethylene (LDPE). In the acid form, typical copolymer behavior was observed where the alpha transition temperature (T;Preliminary experiments probing ionic group and cation mobility in E-MAA samples on a molecular scale were undertaken using... |
