2-(2-Cyanopropyl) Dithiobenzoate-mediated Grafting Polymerization of Methyl Methacrylate from Vinyl Modified Silica

Deling Li; Guanghui Li; Qing Zhang; Guixian Su; Hongxia Zhang

doi:10.7317/pk.2016.40.4.505

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자료유형: 학술저널

저자정보: Deling Li (Tangshan Normal University) Guanghui Li (Tangshan Normal University) Qing Zhang (Tangshan Normal University) Guixian Su (Tangshan Normal University) Hongxia Zhang (Tangshan Normal University)

저널정보: 한국고분자학회 폴리머 폴리머 제40권 제4호

발행연도: 2016.7

수록면: 505 - 510 (6page)

DOI: 10.7317/pk.2016.40.4.505

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Grafting polymerization of methyl methacrylate (MMA) from vinyl modified silica mediated by 2-(2-cyanopropyl) dithiobenzoate was first conducted. Surface radicals generated by the addition reaction of “free” polymeric radicals with surface vinyl could initiate reversible addition-fragmentation chain transfer (RAFT) grafting polymerization of MMA from silica. The RAFT grafting polymerization of MMA from silica exhibited a living character, evident from the linear relationship of grafting ratio with monomer conversion. Grafting polymerization rate appeared dependent on target molecular weight and initiator concentration because of diffusion-controlled RAFT process on silica. The PMMA-grafted silica allowed for a second-step grafting polymerization due to the existence of dithioester group on the chain ends of grafted PMMA. In this case, surface radicals were generated by the reaction of “free” polymeric radicals with the surface RAFT agents, which differed from the RAFT process of grafting polymerization from vinyl modified silica. This method could be extended to prepare a variety of block copolymers from silica.

#grafting #radical polymerization #reversible addition-fragmentation chain transfer #surface modification #diffusion

참고문헌 (18)

참고문헌 신청

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