Precursor of Primary Nucleation in Isotactic Polystyrene Induced by Shear Flow
We performed depolarized light scattering (DPLS) and polarized optical microscope (POM) measurements on the structure formation process or the crystallization process of isotactic polystyrene (iPS) under shear flow below and above the nominal melting temperature Tm. It was found in the DPLS measurements that an anisotropic oriented structure on a μm scale was formed even above the nominal melting temperature. This was also confirmed by POM measurements. This oriented structure must be a precursor of primary nucleation, at least, in the early stage of the formation process. The structure and its formation mechanism are discussed based on the analysis of the DPLS data.
KeywordsPolarize Optical Microscope Oriented Structure Anisotropic Scattering Equilibrium Melting Temperature Primary Nucleation
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