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Viscoelastic properties of branched whole polymers. I. Calculation of relaxation times

✍ Scribed by Peticolas, Warner L.

Book ID
104532194
Publisher
John Wiley and Sons
Year
1962
Weight
322 KB
Volume
58
Category
Article
ISSN
0022-3832

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✦ Synopsis

Abstract

The calculations of the relaxation times of whole polymers has been extended to include the effect or branching. These relaxation times depend upon the weight average of the mean‐square radii, 〈R〉~w~, of the branched polymer molecules. It is proposed that this quantity may be obtained in a θ solvent from the equation [η] = 6^1/2^Φ__C__〈R〉~w~, where [η] is the limiting viscosity number, Φ is a universal constant, and C = Kb, where b is the root‐mean‐square of the end‐to‐end distance of a submolecule and K is the ratio of the number of submolecules to the molecular weight. The constant C may be obtained from measurements of [η] and 〈R〉 on linear, monodisperse polymers. Equations are given by which the effect of branching and molecular weight distribution on rheological measurements may be calculated.

📜 SIMILAR VOLUMES

Viscoelastic properties of branched whol
Viscoelastic properties of branched whole polymers. II. Regularities in the solution viscosity, melt viscosity, and molecular weight
✍ Peticolas, Warner L. 📂 Article 📅 1962 🏛 John Wiley and Sons ⚖ 481 KB

## Abstract For linear polymers there is generally an experimental relation between the melt viscosity η, intrinsic viscosity [η], and viscosity‐average molecular weight __M̄__~__v__~, which forms a one‐dimensional curve in the three‐dimensional space, η, [η], __M̄__~__v__~. Thus, from a knowledge