GLASS TRANSITION EFFECTS IN IMMISCIBLE POLYMER BLENDS

摘要

Bulk polymer properties are altered when they are blended with an immiscible component. A glassy polymer, polymethylmethacrylate (PMMA) was blended with a semi-crystalline one, polypropylene (PP) via melt processing. The effect of blend structure and physical interactions between components on the T_g of the glassy component were studied. Modulated Differential Scanning Calorimetry (MDSC) was used to analyze the glass transition. Even though the components are immiscible, significant correlations between blend composition and glass transition temperatures were observed. Models which could explain this behavior are discussed.