Physical and optical properties of polycarbonate blends with poly(methyl methacrylate-<em>co</em>-phenyl methacrylate) under different phenyl methacrylate compositions.
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Polycarbonate (PC) is a widely used engineering thermoplastic polymer, which has excellent strength, high impact resistance, processability, electrical resistance, and optical transparency. However, its scratch resistance needs to be improved. In this study, PC blends with poly(methyl methacrylate-co-phenyl methacrylate) (PMPA) were fabricated by compounding extrusion process to improve scratch resistance. The thermal, rheological, mechanical, and optical properties of the blends were compared by varying composition of the phenyl groups. Enhanced scratch resistance was achieved by increasing the wt% of PMMA-co-PPhMA (PMPA), but phase inhomogeneity led to decreased optical transparency. PMPA with 14 mol% of PhMA exhibited the most favorable miscibility and phase homogeneity among the prepared blends.