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[Study on the effect of aging on the crystallization behavior of syndiotactic polystyrene with in situ FTIR measurement].

The effect of aging on the crystallization of syndiotactic polystyrene (SPS) in glassy state and delta form was investigated with in situ FTIR. It is shown that both aged sample and unaged sample in glassy state show the same crystallization behavior; whereas for samples in delta form, the aged sample crystallized in higher temperature range than the unaged sample does. This result is correlated with the formation of a more stable complex structure which formed by combining the molecules and the solvents even more tightly during the aging process, and hence the release of the solvents occurs at higher temperature to cause the crystal transition from the solvent-included delta form to the solvent-free gamma form. However, the aging process has on effect on the following crystal transition from gamma form to alpha form.