Abstract
The morphological development of crystallizable polymer blends has been investigated using optical microscopy and infrared and Raman spectroscopy. Both binary and ternary blends were studied. In each case, a crystallizable polyester, either poly(hexamethylene adipate) (PHMA) or poly(hexamethylene sebacate) (PHMS), is mixed with noncrystallizable polyether, poly(propylene glycol) (PPG). Although they possess similar chemical structures, PHMA and PHMS exhibit very different miscibility behavior. In ternary blends, an acrylate, poly(methyl methacrylate and n-butyl methacrylate) [P(MMAnBMA)], is also incorporated in the mixture. With the high spatial resolution achievable (∼1 μm2), the composition distribution can be carried out using a micro-Raman instrument. Specific Raman features associated with polyesters have been established. For immiscible PPG/PHMA blends, the composition and distribution within PHMA-rich and PHMA-poor phases are characterized. The exact composition in each phase has been obtained by ...
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