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Deling Li,Guanghui Li,Qing Zhang,Guixian Su,Hongxia Zhang 한국고분자학회 2016 폴리머 Vol.40 No.4
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.
Xu Deling,Zhou Hong,Li Xiaoyu,Guo Ying 인하대학교 정석물류통상연구원 2009 인하대학교 정석물류통상연구원 학술대회 Vol.2009 No.10
According to research on optical-mechanical-electrical integrated industry in Tianjin, the paper has been applying for domestic and international measurements drawing on the international competitiveness to conduct several achievements on the following fields. such as designing a index system to analyze international competitiveness of large and medium-sized high-tech state-owned enterprises in Tianjin, utilizing AHP and Illegibility Model to evaluate international competitiveness in optical-mechanical-electrical integrated industries of large and medium-sized state-owned enterprises in Tianjim so as to promote some proper countermeasures.
Xu Deling,Li Xiaoyu,Zhou Hong,Song Hongwei 인하대학교 정석물류통상연구원 2009 인하대학교 정석물류통상연구원 학술대회 Vol.2009 No.10
According to research on new energy and highly efficient energy-saving technology industry in Tianjin, the paper has been applying for domestic and international measurements drawing in the international competitiveness to conduct several achievements on the following fields, such as designing a index system to analyze international competitiveness of large and medium-sized high-tech state-owned enterprises in Tianjin, utilizing AHP and Illegibility Model to evaluate international competitiveness in biomedical industry of large and medium-sized state-owned high-tech enterprises in Tianjin so as to promote some proper countermeasures.