ISSN:
0098-1273
Keywords:
Physics
;
Polymer and Materials Science
Source:
Wiley InterScience Backfile Collection 1832-2000
Topics:
Chemistry and Pharmacology
,
Physics
Notes:
Data on the viscosity of poly(vinyl acetate) (PVOAc) and its concentrated solutions in diethyl phthalate (DEP) and cetyl alcohol (CeOH) are examined over the molecular weight range 8 × 103 〈 M 〈 1.3 × 106, the range 0.15 〈 ϕ 〈 1.0 of the volume fraction ϕ of polymer, the temperature range 308 to 430°K for PVOAc and its solutions in DEP, and at 396°K in CeOH. The latter is the θ temperature for dilute solutions of PVOAc in CeOH. The data are analyzed with the relation η = KXc(αϕ2ϕM/Mc)a exp[1/β(T - T0)], where a is 1 or 3.4 for αϕ2ϕM less than or greater than a constant Mc, respectively, and XC, is a constant. The expansion factor αϕ of the chain dimension is found to be essentially unity for ϕ 〉 ca. 0.25, increasing with decreasing ϕ for smaller ϕ. Both β and T0 depend on ϕ, and T0 also depends on M at low M.
Additional Material:
10 Ill.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1002/pol.1979.180171101
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