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Morphology and melting behaviour of poly(butylene terephthalate)
Author(s) -
AlRaheil Ismail A.,
Qudah Ali M. A.
Publication year - 1995
Publication title -
polymer international
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.592
H-Index - 105
eISSN - 1097-0126
pISSN - 0959-8103
DOI - 10.1002/pi.1995.210370106
Subject(s) - endotherm , crystallization , materials science , isothermal process , differential scanning calorimetry , morphology (biology) , scanning electron microscope , melting temperature , poly ethylene , crystallography , thermodynamics , composite material , ethylene , chemistry , biochemistry , catalysis , genetics , physics , biology
Abstract A detailed description of the morphology and the complex melting behaviour of poly(butylene terephthalate) crystallized isothermally from the melt is presented. Triple, double, or single melting endotherms can deliberately be obtained by varying the heating rate in the differential scanning calorimeter (DSC). At low crystallization temperatures, T c , triple melting endotherms were seen when the specimen was scanned at 10°C/min, while at high T c a single endotherm was seen. In the case of the triple melting peaks, the first endotherm corresponds to melting of the imperfect crystals formed at the crystallization temperature. The second endotherm originates from melting of the perfect crystals in the initial distribution, and to some recrystallized meterial. The third endotherm is due to melting of the original crystalline material reorganized during the DSC scan. A detailed morphological study of the isothermally crystallized samples by electron microscopy showed that dominant and subsidiary lamellae in the spherulitic structure are related to perfect and imperfect crystals, respectively.

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