Abstract
Copolymer of 3-(trimethoxysilyl)propyl methacrylate (MSMA) with butyl methacrylate (BMA), 1, and copolymers of styrene (S) with various ratios of acrylic acid (AA), 2, were prepared via monomer-starved polymerization. Dynamic mechanical analysis (DMA) and atomic force microscope (AFM) were used to investigate the blending behavior of these two polymers. For 50/50 (wt) blending systems, DMA measurements showed a shift of a two separated glass transition temperature (Tg) inward to each other or only a broad Tg, depending on the AA content in 2. The domain sizes of 2-rich phase decreased with an increase of the AA contents in 2, as observed by AFM. These results indicated that improved miscibility of these two polymers were obtained, due to formation of interpolymer covalent of Si-O-CO links by reaction of methoxysilane groups presented in 1 with carboxylic acid groups in 2.
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