Rheological measurement of molecular weight distribution of polymers

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题名	Rheological measurement of molecular weight distribution of polymers
链接	http://www.degruyter.com/dg/viewarticle/j$002fepoly.2013.13.issue-1$002fepoly-2013-0120$002fepoly-2013-0120.xml;jsessionid=707FCB04FBFDA57089C5A2E65A36CFFB

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Rheological measurement of molecular weight distribution of polymers

Maryam Khak1 / Ahmad S. A. Ramazani1
1Chemical and Petroleum Engineering Department, Sharif University of Technology, Tehran, Iran
Citation Information: e-Polymers. Volume 13, Issue 1, Pages 217–228, ISSN (Online) 1618-7229, DOI: 10.1515/epoly-2013-0120, May 2013
Publication History

Published Online:
2013-05-30
Abstract

This paper has described a method to obtain the molecular weight distribution (MWD) of polymeric materials from their rheological data. The method has been developed for linear polymers with log normal molecular weight distribution. The rheological data required to obtain the molecular weight distribution are the shear storage modulus,G' (ω) , and shear loss modulus,G" (ω) , extending from the terminal zone to the plateau region. For determining the molecular weight average, the method uses the relationship between stress moduli and relaxation spectrums, with the equation that connects dynamic rheological data with molecular weight distribution, and so it is not necessary to achieve the relaxation spectrums and the molecular weight distribution is obtained directly from dynamic shear experiments and it is one of the main advantageous of the proposed method. Comparison of calculated and experimental data obtained by GPC for five polypropylene samples produced in different conditions show that model can correctly predict molecular weight distribution for these types of polymers.

Keywords: Molecular weight distribution; Rheology; Polypropylene; average molecular weight; GPC

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