Facile Fabrication of Water Dispersible Latex Particles with Homogeneous or Chain-Segregated Surface from RAFT Polymerization Using a Mixture of Two Macromolecular Chain Transfer Agents

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• 作者：Li Sun ; Liangzhi Hong and Chaoyang Wang
• 关键词：block copolymers ; core&ndash ; shell polymers ; phase separation ; reversible addition fragmentation chain transfer
• 刊名：Macromolecular Rapid Communications
• 出版年：2016
• 出版时间：April 2016
• 年：2016
• 卷：37
• 期：8
• 页码：691-699
• 全文大小：1862K
• ISSN：1521-3927

文摘

Water dispersible latex particles with randomly mixed shells or chain segregated surface are synthesized from one-pot reversible addition–fragmentation chain transfer heterogeneous polymerization of benzyl methacrylate (BzMA) using a mixture of poly(glycerol monomethacrylate) (PGMA) and poly(2,3-bis(succinyloxy)propyl methacrylate) (PBSPMA) macromolecular chain transfer agents. In methanol, the two in situ synthesized PGMA-b-PBzMA and PBSPMA-b-PBzMA diblock copolymers coaggregate into spherical micelles, which contain PBzMA core and discrete PGMA and PBSPMA nanodomains on the shell. In contrast, in water–methanol mixture (V/V = 9/1), latex particles with homogeneous distribution of PGMA and PBSPMA polymer chains on the shell are obtained. The reasons leading to formation of latex particles with homogenous or chain-segregated surface are discussed, and polymerization kinetics and physical state of PBSPMA in methanol and water–methanol mixtures are ascribed. These polymeric micelles with patterned functional group on the surface are potentially important for application in supracolloidal hierarchical assemblies and catalysis.