Thermal, rheological and mechanical properties of cation-linked short chain polymer rubbers

simple approach to making rubbery thermoplastic materials using ion/dipole linkages between the low molecular weight polymer chain ends is described. Thermoplastic behavior was observed in the systems such as Mg(ClO;Dynamic light scattering studies reveal three distinct relaxation processes in these systems. The fast process is identical in character, both in time scale and non-exponentiality, to the relaxation process reported in pure PPG. The slower processes are related to the rubbery character of the system. The faster of the two can be extrapolated to the shear stress relaxation around rubber-to-liquid while the exponential slower process is attributed to the diffusion motions of aggregates presented in the system.;All evidences suggest that the thermoplastic behavior is attributed to the thermal rupture of cation-OH links which creates a network of high effective molecular weight at low temperatures.;Metal cations, anions and molecular weight of polymer considerably affect the rheological and mechanical properties of the polymer electrolytes. As the radius of cations increase as ;Shear modulus measurements reveal a rubber-like shear modulus above the glass transition temperature which is characteristic of high molecular weight polymers. Shear stress relaxation measurements and shear viscosity data yield concordant results when related through the Maxwell equation:...