Chemical and Biomolecular Engineering Faculty Research

Title

Comparison of the Molecular Weight and Size Measurement of Polyisobutylenes by Size Exclusion Chromatography/multi-angle Laser Light Scattering and Viscometry

Document Type

Article

Publication Date

Spring 1-27-2006

Abstract

This note reviews hyphenated size exclusion chromatography (SEC) techniques and compares polyisobutylene SEC analyses by multi-angle laser light scattering and viscometry. The weight-average molecular weight and number-average molecular weight were found to be independent of the molecular weight measurement technique used. The reproducibility was found to be better when a known refractive-index increment was used. Significantly, large differences were found in z-average molecular weight data measured by the different techniques. The low shear (Mooney) viscosity correlated well with the weight-average molecular weight and z-average molecular weight only in the case of good SEC separation.

Publication Title

Journal of Polymer Science Part A: Polymer Chemistry

Volume

44

Issue

5

First Page

1777

Last Page

1783