Structure formation of PVDF/PMMA blends studied - Simultaneous DSC/FT-IR measurement

Conformational formation and crystallization dynamics of miscible PVDF/at-PMMA and PVDF/iso-PMMA polymer blends from the molten state were studied by the simultaneous DSC/FT-IR measurement. Formation of TGTG' conformation occurred before starting crystallization exothermic peak in the PMMA content (Phi(PMMA)) range from 0 to 0.4 for both blends. The formation rate of TGTG' conformation, crystal growth rate and surface free energy of PVDF crystal in blends depended linearly on Phi(PMMA) for PVDF/at-PMMA, however, those rates for PVDF/iso-PMMA slightly influenced by Phi(PMMA). These results suggested that the former was miscible blend in molecular level, however, the latter was a miscible blend with large concentration fluctuation or a partially segregated system.