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Microstructural characterization of propylene–butene-1 copolymer using temperature rising elution fractionation

✍ Scribed by Toshinobu Abiru; Akira Mizuno; Frank Weigand

Publisher
John Wiley and Sons
Year
1998
Tongue
English
Weight
228 KB
Volume
68
Category
Article
ISSN
0021-8995

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✦ Synopsis

Propylene-butene-1 copolymer (PBC) prepared with a titanium catalyst system was fractionated by temperature rising elution fractionation (TREF) over a temperature range of 5-80ЊC. PBC was shown to have a wide composition distribution ranging between 12-47 mol % of butene-1. Most of the fractions showed nearly the same crystallinity regardless of the butene-1 content. However, the solubility of the crystalline parts, which turned out to be the driving force for the fractionation, varied over the butene-1 content. Evidence that PBC shows isomorphism was obtained by the analysis of fractionated polymers, using 13 C nuclear magnetic resonance spectrometry, X-ray diffraction, differential scanning calorimetry, and gel permeation chromatography.

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## Abstract The intermolecular structural heterogeneity of a propylene‐ethylene random copolymer was studied by preparative temperature rising elution fractionation combined with GPC, ^13^C‐NMR, differential scanning calorimetry, and wide‐angle X‐ray diffraction analysis of the obtained fractions.