𝔖 Bobbio Scriptorium
✦   LIBER   ✦

Polymer solutions. VIII. A new absolute method of molecular weight determination of polymers from solution viscosities

✍ Scribed by Gundiah, S. ;Kapur, S. L.

Publisher
John Wiley and Sons
Year
1962
Weight
461 KB
Volume
57
Category
Article
ISSN
0022-3832

No coin nor oath required. For personal study only.

✦ Synopsis

Abstract

An empirical method for absolute molecular weight determination of polymers from viscosity measurements is described. The essential assumptions of the method are: (a) the Huggins' slope constant for any flexible polymer has a maximum value of 0.5 at the precipitation point; (b) the viscosity—concentration plots for a particular polymer in different solvents (when extrapolated) meet at a common point; (c) the ordinate at the common point of intersection [η]~R~ (when the viscosity function is In η~r~/c is identical with the limiting viscosity number for the polymer at the point of incipient precipitation); (d) the value of the ordinate at the common point of intersection [η]~R~ is related to molecular weight by the relation [η]~R~ = 9.0 × 10^−4^M^0.5^. The method gives satisfactory results in case of polymers like polystyrene and polymethyl acrylate.

📜 SIMILAR VOLUMES

Molecular weight of polymers from electr
Molecular weight of polymers from electrical resistivity of solutions
✍ Purdon, J. R. ;Morton, M. 📂 Article 📅 1962 🏛 John Wiley and Sons ⚖ 757 KB

## Abstract An investigation has been carried out to further establish the usefulness of electrical resistivity techniques for the study of polymerization kinetics, and to determine the extent of molecular weight dependence of electrical resistivity. The resistivity increment, (__p − p__0)/~__p__0~

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