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Abstract
The techniques of wide-angle X-ray diffraction, infra-red spectroscopy and differential scanning calorimetry were used to characterize the glass transition and crystallization behavior of freeze-dried isotactic polystyrene (iPS) derived from dilute solutions. It was found that there is a concentration boundary for the original solution: below the boundary, the freeze-dried iPS samples are poorly crystallized but the chains are in a highly ordered 3 1 helix state; above the concentration boundary, the freeze-dried iPS is in a completely disordered amorphous state.
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