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Home  >  Journal list  >  Journal of the Society of Materials Science, Japan  >  Vol.57  No.12 (2008)  >  pp.1236-1239

Journal of the Society of Materials Science, Japan
<<Previous article Vol.57  No.12 (2008)   pp.1236 - 1239 Next article>>

Dynamic Viscoelasticity of Poly(butylene terephthalate) during Isothermal Crystallization

Wataru KINOSHITA1), Hisahiko KASHIHARA1), Kenji URAYAMA1) and Toshikazu TAKIGAWA1)
1) Dept. Mater. Chem., Kyoto Univ.


The dynamic viscoelastic behavior during isothermal crystallization of poly(butylene terephthalate) (PBT) has been investigated as a function of crystallization temperature (Tc). The enthalpy of crystal formation during the isothermal crystallization is also examined by differential scanning calorimetry (DSC). The equilibrium degree of crystallization in the long time limit is about 30%, almost independently of Tc. Correspondingly, the viscoelastic parameters at the equilibrium of crystallization are also independent of Tc. The crystallization rate decreases with increasing Tc, and the Tc dependence is well approximated by the Arrhenius type equation. The effect of crystallization on the viscoelasticity is considerably small in the initial stage of crystallization whereas it becomes pronounced in the later stage.


Keyword:
Poly(butylene terephthalate), Crystallization, Viscoelasticity

Received: April 08, 2008
Published online: December 19, 2008
Copyright (c) 2008 by The Society of Materials Science, Japan

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