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Molecular weight distribution of a segmented copolymer of PET–PCL
Author(s) -
Fai Woo Ka,
Chi Wu,
Zhu Ma De,
Lie Luo Xiao
Publication year - 1995
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.1995.070571104
Subject(s) - copolymer , molar mass distribution , solvent , materials science , polymer chemistry , distribution (mathematics) , chemical engineering , chemistry , composite material , polymer , mathematics , organic chemistry , mathematical analysis , engineering
A recently developed method of combining both the results of static and dynamic laser light scattering (LLS) was applied to characterize the segmented copolymer of poly(ethylene terephthalate‐ co ‐caprolactone) (PET–PCL) with 48% PET content. Unlike the traditional three‐solvent method proposed by Bushuk and Benoit for copolymers, this method requires only two solvents. For each solvent, the apparent weight average molecular weight ( M w ,app ) was measured by static LLS. Then M w ,app was used as a constraint to convert the line‐width distribution from dynamic LLS into the apparent molecular weight distribution. Finally, the two apparent molecular weight distributions were combined to give both the true molecular weight distribution and the estimated chain composition distribution of the copolymer. We found that the PET–PCL sample with 48% PET is nearly uniform in the chain composition. © 1995 John Wiley & Sons, Inc.