Abstract
Dynamic viscoelasticity during isothermal crystallization for polybutene-1 was investigated at temperatures between 90.9 and 97.3°C. Crystallization increased storage and loss moduli intensively. The crystallinity defined by dynamic measurements (xG) as (Gt-G0)/(G∞-G0) was discussed. At the same crystallizing temperature (Tc), the xG curves determined from G' coincided with those from G". The xG curves did not depend on the measured frequencies. The xG curves at different Tc could be superposed by horizontal shifts. The shift factors were the same as those for the data obtained by DSC. By comparing the data obtained by the viscoelastic measurements, it was found that the crystallinity from dynamic measurements increases more rapidly in short time.
