| Abstract
| - Isotactic polystyrene (iPS) was rapidly crystallized by cooling a solution in the large moleculesolvent octadecyl benzoate at a rate of 10 °C/min. The crystallinity is near 0.7 measured by the wide-angle X-ray diffraction method, which is much higher than that for iPS samples crystallized by solutioncrystallization in a small molecule solvent, solvent-induced crystallization, high temperature annealing,and their combinations. Fourier Transform infrared spectroscopic shows that the iPS chains in theconcentrated solution in octadecyl benzoate had a highly ordered 31 helical conformation. It is presumedthat the molar size of solvent exerted a large influence on the formation of helical conformation and,thereby, on the crystallization rate of iPS in the solution.
|
