Abstract
The effects of dilution upon the viscoelastic behavior of polymers are discussed and the related results of two investigations on solvent effects are presented. The creep behavior of a 40% polyvinylacetate (PVAc) solution where the solvent, sucrose benzoate, has a higher glass temperature than the PVAc is presented. Since the glass temperature, T g, of the solution is between that of the polymer and the solvent, it is higher than that of the neat polymer. In the second study, the viscosity and the recoverable compliance of six molecular-weight bimodal blends of a high (3.8×10 6) and a low (1.03×10 4) molecular-weight polystyrene were determined. The low molecular-weight component played the role of a Flory theta solvent at long times at all temperatures, enabling the determination of the steady-state recoverable compliance, J e o , of the high-molecular components as a function of concentration under theta conditions. Retardation spectra were determined from the reduced shear compliance curves for all the solutions and the neat components.
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