Abstract
The intrinsic viscosities [η] of polyacrylamide (PAM) having different average molecular weights are measured in various mixtures of water (good solvent) and N, N dimethyl formamide (DMF, nonsolvent) at different temperatures. The observed results show a significant variation of cosolvency as a function of solvent composition (ϕDMF). The nature of curves in [η] vs. ϕDMF plot at different temperatures indicates the existence of two antagonistic effects. The unperturbed dimensions (Kθ) of the polymer are determined by a number of methods, which agree well with each other. The temperature coefficient of unperturbed dimension (K′), molecular extension factors (αn), characteristic ratio (Cα) and chain rigidity (σ) are evaluated and the effects of temperature, solvent composition are discussed. The volume related parameter VE and shape factor ν were also computed, which shows the shape of polymer molecules to be more or less spherical in solution.
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