In-Situ Synthesis of Multicompartment Nanoparticles of Linear BAC Triblock Terpolymer by Seeded RAFT Polymerization

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• 作者：Fei Huo ; Shentong Li ; Quanlong Li ; Yaqing Qu ; Wangqing Zhang
• 刊名：Macromolecules
• 出版年：2014
• 出版时间：April 8, 2014
• 年：2014
• 卷：47
• 期：7
• 页码：2340-2349
• 全文大小：579K
• 年卷期：v.47,no.7(April 8, 2014)
• ISSN：1520-5835

文摘

A new strategy of in-situ synthesis of multicompartment nanoparticles of the linear BAC triblock terpolymer of polystyrene-b-poly(N,N-dimethylacrylamide)-b-poly(4-vinylpyridine) (PS-b-PDMA-b-P4VP) is proposed. This strategy includes the initial seeded RAFT polymerization of 4-vinylpyridine in the ethanol/water mixture (50/50 by weight), which is the solvent for the C block of the newly formed poly(4-vinylpyridine) (P4VP), in the presence of the diblock copolymer seed nanoparticles of polystyrene-b-poly(N,N-dimethylacrylamide) trithiocarbonate with the Z-group RAFT terminal at the outer side of the solvophilic A block of poly(N,N-dimethylacrylamide) (PDMA), and the subsequent transfer of the in-situ synthesized core鈥揷orona nanoparticles of PS-b-PDMA-b-P4VP containing a polystyrene (PS) core and a diblock corona of poly(N,N-dimethylacrylamide)-b-poly(4-vinylpyridine) into water to deposit the C block of the newly formed P4VP block onto the PS core to form discrete P4VP nodules to form multicompartment nanoparticles. With the increasing polymerization degree of the P4VP block, the multicompartment nanoparticles can convert into concentric core鈥搒hell鈥揷orona nanoparticles. Two reasons of (1) the P4VP block being immiscible with the PS block and (2) the special seeded RAFT polymerization avoiding the P4VP block being entrapped into the PS core are ascribed to the successful preparation of the linear BAC triblock terpolymer multicompartment nanoparticles.