Divergent strategy for the synthesis of bottlebrush polymers via postpolymerization modification of macromonomer |
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Authors: | Nam Joo Lee Dongseok Kim Kwangho Yoo Yeji Yu Byeong-Su Kim Jeung Gon Kim |
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Affiliation: | 1. Department of Chemistry, Research Institute of Physics and Chemistry, Jeonbuk National University, Jeonju, Republic of Korea;2. Department of Chemistry, Yonsei University, Seoul, Republic of Korea;3. Department of Chemistry, Yonsei University, Seoul, Republic of Korea Department of Chemistry, Research Institute of Physics and Chemistry, Jeonbuk National University, Jeonju, Republic of Korea |
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Abstract: | A simple and divergent synthetic strategy of bottlebrush polymers (BBPs) is presented, consisting of postpolymerization modification of a macromonomer and grafting-through polymerization. Beginning with a single macromonomer, its direct modification could build a library of macromonomers with an identical chain length, thus guaranteeing the precision in the synthesis of BBPs. In this study, a newly designed norbornenyl-terminated poly(methyl acrylate) (NB-PMA) is proposed as a chemically robust template. Ti-mediated transesterification of NB-PMA successfully produces structurally diverse polyacrylates while maintaining the terminal norbornenyl group intact. All macromonomers obtained from transesterification possess a good grafting-through ring-opening metathesis polymerization reactivity, furnishing homo, random, and block BBPs in a controllable manner. Moreover, atomic force microscopy analysis supports the controlled side-chain length distribution in the resulting BBPs. |
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Keywords: | bottlebrush polymers grafting-through polymerization postpolymerization modifications ring-opening metathesis polymerization |
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