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- W1971532227 abstract "For a number of polyvinyl alcohol (PVA) samples polymerized at 60°C., viscosities of their concentrated aqueous solutions were measured over the ranges of concentration from 1% to 25% (ww) and of temperature from 30°C. to 80°C. It was found that: (1) The relative viscosity may be expressed in terms of a single function of (C25 Mw3.4) over the range of C25 Mw3.4 from 1.5 × 1011 to 1.6 × 1013 at 30°C.; this range is temperature dependent. (2) The critical value of V2Zw, which is interpreted as the onset of a continuous network with ξ = 2, changes from 200 at 30°C. to 240 at 80°C., where V2 is the volume fraction of polymer in solution, Zw is the weight-average chain length, and ξ is the average number of entanglement points per molecule. Ferry's empirical law, ηr ∝ C25 Mw3.4, appears to hold in the range 2 < ξ < 5 for PVA and many other polymers (polystyrene, polymethyl methacrylate, and cellulose derivatives), except for polyisobutylene, for which the glass transition temperature is very low compared with that of other polymers. (3) The concentration dependence of activation energy for viscous flow of PVA is similar to that of cellulose derivatives. (4) In the low molecular weight region (M < Mcrit), the molecular weight dependence of viscosity varies with temperature and concentration." @default.
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- W1971532227 title "Viscosity of moderately concentrated aqueous solutions of polyvinyl alcohol" @default.
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- W1971532227 doi "https://doi.org/10.1016/0095-8522(62)90054-5" @default.
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