自缩合开环加聚反应的研究

This program synthesized the hyperbranched polyether with terminal/side hydroxyl groups via a self-condensing ring opening polymerization of 3-methyl-3-hydroxymethyloxetane. It was found that the degree of branching and the degree of crystallinaty of the resulting hyperbranched polymer depend on the molar ratio of monomer to catalyst. The article was published on Macromol. Rapid Commun. even though Penczek and co-workers reported a similar work on the cationic polymerization of 3-ethyl-3-hydroxymethyloxetane in the same journal when we revised our manuscript in accordance with the comments of reviewers. Subsequently, the hyperbranched polyether was further functionated by end modification, and a star-shaped copolymer with a hyperbranched core and polytetrahydrofuran arms was synthesized by an one-pot copolymerization. The second major contribution of this program is that we developed several novel approaches to synthesis of hyperbranched polymers in a large scale from commercial monomers on the basis of non-equal reactivities of different groups. Various novel hyperbranched polymers with different terminal/side groups, degrees of branching, physical properties and functions heve been prepared. In addition, the financial grant of this program also benefited other research work of this laboratory, such as living/controlled radical polymerization, polyelectrolytes, highly soluble polyimides, supramolecular complex and new nylons with long alkene segments. As many as 55 papers have been published on SCI journals, and 5 conference preprints have been recorded by SCI as well. Besides, 13 patents have been registered.

在前期工作中，我们已实现了自缩合开环聚合反应，制得高度支化并具有大量端基的聚醚多元醇，拟改进催化系统，优化聚合反应工艺条件，提高产物分子量；建立产物支化度的表征方法；设计和合成新的单体和超支化聚合物；合成超支化共聚物；建立有关聚合反应的动力学模型；最后利用所得超支化聚醚多元醇及共聚物试制无溶剂涂料和醇水分离功能膜材料。.