Synthesis and Properties of a Coil-g-Rod Polymer Brush by Combination of ATRP and Alternating Copolymerization

We synthesized a coil-g-rod polymer brush, poly{styrene-alt-(maleimide-g-poly{2,5-bis[(4-methoxyphenyl)oxycarbonyl]styrene})}(P{St-alt-(MI-g-PMPCS)}), by alternating copolymerization of styrene (St) and maleimide-terminated poly{2,5-bis[(4-methoxyphenyl)oxycarbonyl]styrene} (MI-PMPCS) with the “grafting through” strategy. MI-PMPCS was synthesized by using the protection strategy in which the initiator protected by Diels–Alder reaction with furan was used to initiate atom transfer radical polymerization of 2,5-bis[(4-methoxyphenyl)oxycarbonyl]styrene (MPCS), and then furan was deprotected by retro-Diels–Alder reaction. 1H NMR, gel permeation chromatography (GPC), and GPC coupled with multiangle laser light scattering were used to determine the chemical structures and molecular weights of the polymer brushes. The highest degree of polymerization (DP) of the main chain is 103, which is significantly large for polymer brushes with rigid side chains. The main-chain length increases with increasing feeding rati...

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