Concentration Dependence of Crystalline Poly(ethylene terephthalate) Prepared by Freeze-Extracting Solutions

A new method is described for the crystallization of poly(ethylene terephthalate) (PET). By dropping the PET/phenol solution into ice water followed by freeze-extracting the frozen solvent with ethanol, a PET powder has been obtained that exhibits much higher crystallizability than a solution cast f...

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Veröffentlicht in:	Macromolecules 1996-01, Vol.29 (7), p.2691-2693
Hauptverfasser:	Ji, Gending, Ni, Hengmei, Wang, Chong, Xue, Gi, Liao, Yih-Tyan
Format:	Artikel
Sprache:	eng
Schlagworte:	Applied sciences Composition effects Conformations Crystallization Differential scanning calorimetry Exact sciences and technology Fluorescence Freezing Melting Organic polymers Phenols Physicochemistry of polymers Properties and characterization Quenching Thermodynamic properties X ray crystallography
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Beschreibung
Zusammenfassung:	A new method is described for the crystallization of poly(ethylene terephthalate) (PET). By dropping the PET/phenol solution into ice water followed by freeze-extracting the frozen solvent with ethanol, a PET powder has been obtained that exhibits much higher crystallizability than a solution cast film. Annealing the freeze-extracted PET prepared from the 0.2% solution, a highly PET with 65% crystallinity has been obtained. The conformational and thermal properties of these freeze-extracted PET are discussed and an explanation is proposed for their high crystallizability in terms of chain entanglement.
ISSN:	0024-9297 1520-5835
DOI:	10.1021/ma951041w