Abstract
Abstract Synthesis and gas permeability of random and block copolymers of a cyclotetrasiloxane-containing methacrylate have been studied in comparison with those of tris(trimethylsiloxy)silane-containing methacrylate (MTTS) copolymers. Random and block copolymers of 3-(heptamethyl cyclotetrasiloxanyl) propyl methacrylate (HCPM) and methyl methacrylate (MMA) were prepared by radical copolymerization using 2,2′-azobisisobutyronitrile and a poly(azoinitiator), poly(1,6-hexamethylene 4,4′-azobiscyanopentanoate), respectively. Differential scanning calorimetry (DSC) revealed that HCPM-MMA block copolymers exhibited heterogeneous phases, as evidenced by two distinct glass transition temperatures due to poly-HCPM (PHCPM) block and PMMA block, while the single glass transition temperatures in the homogeneous phases in HCPM-MMA random copolymers lowered with HCPM content. The oxygen and nitrogen gas permeability coefficients of HCPM-MMA random copolymer films measured at 23°C were found to steeply increase with HC...
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