Synthesis of sequence-controlled copolymers from extremely polar and apolar monomers by living radical polymerization and their phase-separated structures
Synthesis of sequence-controlled copolymers from extremely polar and apolar monomers by living radical polymerization and their phase-separated structures
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DOI：
10.1002/pola.21095
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发表时间：
2005-12-01
影响因子：
--
通讯作者：
Ishihara, K
中科院分区：
文献类型：
--
作者：
Inoue, Y;Watanabe, J;Ishihara, K
采用可逆加成-裂解链转移（RAFT）活性自由基聚合法合成了由极性磷胆碱基团和极性氟碳基团组成的两个单体单元，单体单元顺序可控的共聚物。选择2-甲基丙烯酰氧乙基磷酸胆碱（MPC）和2,2,2-三氟甲基丙烯酸乙酯（TFEMA）作为单体，因为它们具有不同的极性。此外，为了研究聚合物链中单体单元顺序对体相分离结构和表面结构的影响，合成了沿聚合物链中单体单元组成连续变化的共聚物（梯度共聚物），以及随机和嵌段共聚物。瞬时组成分析表明，梯度共聚物的单体单位组成和随机共聚物的统计单体单位顺序连续变化。热分析假设单体单元的梯度序列会使体中的相分离结构不明确，而定义良好的单色散块段序列则会由于组分单体单元极性的极大差异而发生明显的相分离。合成聚合物的初步表面表征表明，聚合物链上单体单元的顺序对其表面结构有很大影响。(c) 2005 Wiley期刊有限公司
A series of copolymers composed of two monomer units having a polar phosphorylcholine group and an apolar fluorocarbon group with a controlled monomer unit sequence were synthesized by a reversible addition-fragmentation chain transfer (RAFT) living radical polymerization method. 2-Methacryloyloxyethyl phosphorylcholine (MPC) and 2,2,2-trifluoroethyl methacrylate (TFEMA) were selected as the monomers, because they have disparate polarity. Furthermore, to investigate the influence of the monomer unit sequence in a polymer chain on the phase-separated structure in the bulk and surface structure, copolymers having a continuous change in the monomer unit composition along the polymer chain (gradient copolymer) were synthesized, as well as random and block copolymers. The analysis of instantaneous composition revealed a continuous change in the monomer unit composition in the gradient copolymer and the statistical monomer unit sequence in the random copolymer. Thermal analysis assumed that the gradient sequence of the monomer unit would make the phase-separated structure in the bulk ambiguous, while the well-defined and monodispersive block sequence would undergo the distinct phase-separation due to the extreme difference in the polarity of the component monomer units. The preliminary surface characterization of the synthesized polymers indicated the monomer unit sequence in the polymer chain would much influence on the surface structure. (c) 2005 Wiley Periodicals, Inc.