ISSN:
0449-2978
Keywords:
Physics
;
Polymer and Materials Science
Source:
Wiley InterScience Backfile Collection 1832-2000
Topics:
Chemistry and Pharmacology
,
Physics
Notes:
Light scattering and viscosity have been measured at 25°C. for dilute solutions of six unfractionated polyoxymethylene samples in the mixed solvent hexafluoroacetone-water (mole ratio 1/1.7) slightly buffered with triethylamine. Dialysis equilibrium through porous Vycor glass thimbles indicates that the polymer is strongly solvated by the hydrate (CF3)2C(OH)2, and this must be taken into account in evaluating weight-average molecular weights from the light-scattering data. Over the molecular weight range 23,000-185,000, the intrinsic viscosities (in deciliter per gram) follow the relation \documentclass{article}\pagestyle{empty}\begin{document}$ [\eta] = 8.7{\rm} \times {\rm}10^{ - 4} M_\upsilon ^{0.69} $\end{document} The corresponding unperturbed dimensions are σ = 2.3 ± 0.2 or r02/nl2 = 10.5 ± 1.5.
Additional Material:
3 Ill.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1002/pol.1966.160040313
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