Morphology and Molecular Motion of Poly(ethylene terephthalate) in Polymer/Oligomer Gel

Morphology and Molecular Motion of Poly(ethylene terephthalate) in Polymer/Oligomer Gel

The structural heterogeneity and molecular motion in a thermoreversible gel consisting of poly(ethylene terephthalate) (PET) and a liquid ethylene glycol oligomer (PEG) was investigated by solid-state NMR and FT−Raman spectroscopies. PET was dissolved in PEG at elevated temperatures to form a concen...

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Veröffentlicht in:Macromolecules 1998-11, Vol.31 (22), p.7706-7711
Hauptverfasser: Xue, Gi, Ji, Gending, Yan, Hong, Guo, Mingming
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Sprache:eng
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Applied sciences
Exact sciences and technology
Organic polymers
Physicochemistry of polymers
Properties and characterization
Solution and gel properties
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container_end_page 7711
container_issue 22
container_start_page 7706
container_title Macromolecules
container_volume 31
creator Xue, Gi
Ji, Gending
Yan, Hong
Guo, Mingming
description The structural heterogeneity and molecular motion in a thermoreversible gel consisting of poly(ethylene terephthalate) (PET) and a liquid ethylene glycol oligomer (PEG) was investigated by solid-state NMR and FT−Raman spectroscopies. PET was dissolved in PEG at elevated temperatures to form a concentrated solution (30 wt %), and the solution formed a gel rapidly on cooling. For the purpose of comparison, a PET/phenol binary system and PET crystallized by annealing methods were also investigated. The longest solid-state NMR relaxation times of 13C ( 13C T 1) in PET of PET/PEG gel among the samples indicated the slowest molecular motion and the highest rigidity PET chains. The structural heterogeneity of the PET/PEG gel investigated by H T 1 measurement and confirmed by FT−Raman spectroscopy indicated phase transition during gelation. The crystallinity of PET recovered from polymer/oligomer gels is near 70% as measured by wide-angle X-ray diffraction, which is about 20% higher than that for PET samples crystallized by solution crystallization and high-temperature annealing techniques.
doi_str_mv 10.1021/ma9802576
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subjects Applied sciences
Exact sciences and technology
Organic polymers
Physicochemistry of polymers
Properties and characterization
Solution and gel properties
title Morphology and Molecular Motion of Poly(ethylene terephthalate) in Polymer/Oligomer Gel
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