Crystallization of Poly(butylene terephthalate) from the Glass

Crystallization from the glass of poly(butylene terephthalate) (PBT) has been investigated by small-angle X-ray scattering and differential scanning calorimetry. When PBT crystallizes from the glassy state, the nodule crystalline structures in nanometer scale forms and the micrometer order objects,...

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Bibliographic Details
Published in:Macromolecules 2010-01, Vol.43 (1), p.375-383
Main Authors: Konishi, Takashi, Miyamoto, Yoshihisa
Format: Article
Language:English
Subjects:
Applied sciences
Crystallization
Exact sciences and technology
Organic polymers
Physicochemistry of polymers
Properties and characterization
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Summary:Crystallization from the glass of poly(butylene terephthalate) (PBT) has been investigated by small-angle X-ray scattering and differential scanning calorimetry. When PBT crystallizes from the glassy state, the nodule crystalline structures in nanometer scale forms and the micrometer order objects, i.e., spherulites, are not observed. The nodule size grows and saturates at a given annealing temperature and increases with increasing annealing temperature. Two temperatures are obtained by the linear extrapolation of the temperature dependence of the reciprocal nodule size to naught. The equilibrium melting temperatures by the Gibbs−Thomson plot, i.e., the melting temperature versus reciprocal nodule size, are also the same temperatures. The lower extrapolated temperature corresponds to the equilibrium melting temperature of the α-form of PBT. The higher extrapolated temperature is discussed on the basis of the Strobl crystallization model and can be regarded as the equilibrium mesophase−crystal transition temperature.
ISSN:0024-9297
1520-5835
DOI:10.1021/ma9017058