Miscibility and related rheological, physical, and optical properties of polycarbonate/poly(methyl methacrylate-co-phenyl methacrylate) blends: Effect of varying phenyl methacrylate composition

This study presents a systematic investigation of miscibility, rheological, and physical/optical properties of polycarbonate (PC)/poly (methyl methacrylate-co-phenyl methacrylate) (PMMA-co-PPhMA) blends with varying copolymer composition and blend weight percentage (wt%). Herein, single glass transition behavior from miscible blends was confirmed through differential scanning calorimetry (DSC) and dynamic mechanical analyzer (DMA), while further analysis revealed differences in blend homogeneity. X-ray scattering and rheometer measurements complemented this different phase homogeneity in the blends. PMMA-co-PPhMA with 14 mol% of PhMA (denoted as PMPA-2) demonstrated the most favorable miscibility and phase homogeneity among the prepared blends. Enhanced scratch resistance was achieved by increasing the wt% of PMMA-coPPhMA, but phase inhomogeneity resulted in decreased optical transparency. The blend between PC and PMPA-2 exhibited optimal rheological, mechanical, and optical properties. This study provides insights into the PC-based blend materials for applications in various industrial fields.