含聚（乙二醇）-嵌段-聚（丙二醇）侧链的聚甲基丙烯酸酯分子刷的构象、自组装及热响应性

Conformation, Self-Organization and Thermoresponsibility of Polymethacrylate Molecular Brushes with Oligo(ethylene glycol)-block-oligo(propylene glycol) Side Chains.

作者信息

Simonova Maria, Kamorin Denis, Kazantsev Oleg, Nepomnyashaya Maria, Filippov Alexander

机构信息

Institute of Macromolecular Compounds of the Russian Academy of Sciences, Bolshoy Prospekt 31, 199004 Saint Petersburg, Russia.

Laboratory of Acrylic Monomers and Polymers, Department of Chemical Technology, Dzerzhinsk Polytechnic Institute, Nizhny Novgorod State Technical University n.a. R.E. Alekseev, 24 Minin Street, 603950 Nizhny Novgorod, Russia.

出版信息

Polymers (Basel). 2021 Aug 13;13(16):2715. doi: 10.3390/polym13162715.

Polymethacrylic molecular brushes with oligo(ethylene glycol)-block-oligo(propylene glycol) side chains were investigated by static and dynamic light scattering and viscometry. The solvents used were acetonitrile, tetrahydrofuran, chloroform, and water. The grafted copolymers were molecularly dispersed and dissolved in tetrahydrofuran and acetonitrile. In these solvents, the molar masses of copolymers were determined. In thermodynamically good solvents, namely tetrahydrofuran and acetonitrile, investigated copolymers have a high intramolecular density and the shape of their molecules resembles a star-shaped macromolecule. In chloroform and water, the micelle-like aggregates were formed. Critical micelle concentrations decreased with the lengthening of the hydrophobic block. Molecular brushes demonstrated thermosensitive behavior in aqueous solutions. The phase separation temperatures reduced with an increase in the content of the oligo(propylene glycol) block.

通过静态和动态光散射以及粘度测定法研究了带有聚（乙二醇）-嵌段-聚（丙二醇）侧链的聚甲基丙烯酸分子刷。所使用的溶剂为乙腈、四氢呋喃、氯仿和水。接枝共聚物以分子形式分散并溶解于四氢呋喃和乙腈中。在这些溶剂中，测定了共聚物的摩尔质量。在热力学良溶剂（即四氢呋喃和乙腈）中，所研究的共聚物具有较高的分子内密度，其分子形状类似于星形大分子。在氯仿和水中，则形成了胶束状聚集体。临界胶束浓度随疏水嵌段长度的增加而降低。分子刷在水溶液中表现出热敏行为。相分离温度随聚（丙二醇）嵌段含量的增加而降低。