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A New View of the Initiation and Propagation in Anionic Polymerization

Chinese Journal of Chemistry 2013年第3期31卷 393-400页

作者： Anna Zheng Bo Chen Dihang Hu Yong Guan Dafu Wei Shuzhao Li Dandan Ji Shanghai Key Laboratory of Advanced Polymeric Materials Key Laboratory for Ultrafine Materials ofMinistry of Education School of Materials Science and Engineering East China University of Science and Technology Shanghai 200237 China

This work confirms the new view of the initiation and propagation mechanism of the anionic polymerization previously proposed, based on the investigation of anionic bulk-polymerization of styrene and α-methyl styrene with the help of a self designed microflow device and characterized by GPC and in situ ^7Li NMR. It was found that n-BuLl tended to form the hexameric-aggregated structure and even to form the huge aggregated structure based on the former. These aggregations of initiators could directly initiate the anionic polymerization and form the su-pramolecule aggregations. The supramolecule aggregations inevitably blocked the diffusion of the monomers to the ion-pairs and resulted in a stationary-conversion platform. Then the aggregators were dissociated completely into equal binary-aggregated species, and the polymerization continued again rapidly before the termination. Tetrahy-drofuran （THF） acted as the electron donator, which could push the electron cloud to Li cation and make the aggre- gated ring of the active species rather loosened and facilitated the monomer to insert in. Therefore, a little THF can greatly promote the anionic polymerization. However, further addition of THF might block the channel between the ion-pairs and decrease the propagation rate. It was also found that the aggregated structure of the active species during the anionic polymerization only depends on the initiator aggregations which were formed before the polym-erization.

关键词： anionic polymerization initiation mechanism in situ 7^Li NMR organolithium supramolecular aggre-gator

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