共查询到18条相似文献,搜索用时 640 毫秒
1.
二氧化碳是一种廉价、低毒、资源丰富的可用于有机合成的理想原料。由二氧化碳和环氧化合物共聚合成的脂肪族聚碳酸酯具有生物可降解性。自1969年井上祥平等发现二氧化碳和环氧化合物通过共聚反应合成脂肪族聚碳酸酯以来,利用二氧化碳制备高分子材料一直备受人们注目。该过程的关键是寻找具有高选择性的高效催化剂,三十余年来通过各国科学家的不懈努力已取得了不少成果,本文对其研究的最新进展进行了综述。 相似文献
2.
3.
4.
综述了国内外用于二氧化碳与环氧环己烷共聚的各类催化剂的研究现状、进展及研发新动向.指出二氧化碳作为一种廉价、无毒、可循环利用的理想原料,利用其和环氧环己烷共聚可合成具有良好生物降解性能的脂肪族聚碳酸酯.但二氧化碳具有较高的热力学稳定性,其和环氧环己烷共聚过程在一般情况下难以实现,故迫切需要开发高效、高选择性的催化剂. 相似文献
5.
6.
以CO_2为原料合成脂肪族聚碳酸酯材料不仅利用了廉价、可再生的CO_2资源,而且可以实现全生物降解高分子材料的制备,是一条绿色可持续的高分子材料合成路线。但长期以来,该领域研究多集中在利用CO_2与一些石油来源的环氧烷烃(如环氧丙烷、环氧环己烷等)共聚方面,未能完全摆脱对石油资源的依赖。因此,发展基于生物基的环氧单体制备全生物基高分子材料逐渐成为CO_2基高分子材料研究的热点。生物基来源化合物的引入有助于丰富CO_2基高分子材料的结构和性能,拓展其应用领域。本文综述了近年来利用生物基环氧化合物与CO_2共聚合成全生物基高分子材料的研究进展,并对未来该领域发展的趋势进行了展望。 相似文献
7.
8.
9.
有机硼化合物是近年来广泛研究的一类非金属催化剂,其在环氧烷烃参与的开环均聚合和共聚合方面展现了良好的适用性,但二元亲电亲核双组分催化体系在加入大量的反应单体后由于稀释效应带来的熵不利因素往往导致活性减小或失活的问题,同时也难以制备大分子量的聚合物材料.基于此,本文主要综述了本课题组设计的分子内同时含有亲电和亲核中心的双功能有机硼-季铵盐和有机硼-季鏻盐催化体系的研究进展,重点梳理了此类双功能有机硼催化剂的设计脉络和设计原则,对比了双功能和双组分有机硼催化体系之间的聚合反应机理,总结了利用双功能有机硼催化剂在环氧烷烃开环聚合制备脂肪族聚醚、环氧烷烃和二氧化碳共聚合制备二氧化碳基聚碳酸酯、环氧烷烃和环状酸酐共聚合制备聚酯等方面的内容,展望了有机硼催化剂在高分子合成化学方向的未来和趋势. 相似文献
10.
11.
12.
13.
14.
Hiroshi Sugimoto Hiromitsu Ohshima Shohei Inoue 《Journal of polymer science. Part A, Polymer chemistry》2003,41(22):3549-3555
The first successful example of the formation of polycarbonate from 1-atm carbon dioxide and epoxide was demonstrated by the alternating copolymerization of carbon dioxide and epoxide with manganese porphyrin as a catalyst. The copolymerization of carbon dioxide and cyclohexene oxide with (porphinato)manganese acetate proceeded under the 1-atm pressure of carbon dioxide to give a copolymer with an alternating sequence. © 2003 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem 41: 3549–3555, 2003 相似文献
15.
Hiroshi Sugimoto Shohei Inoue 《Journal of polymer science. Part A, Polymer chemistry》2004,42(22):5561-5573
An erratum has been published for this article in J Polym Sci Part A: Polym Chem (2005) 43(4) 916 . The alternating copolymerization of carbon dioxide and epoxide to produce polycarbonate has attracted the attention of many chemists because it is one of the most promising methodologies for the utilization of carbon dioxide as a safe, clean, and abundant raw material in synthetic chemistry. Recent development of catalysts for alternating copolymerization is based on the rational design of metal complexes, particularly complexes of transition metals with well‐defined structures. In this article, the history and recent successful examples of the alternating copolymerization of carbon dioxide and epoxide are described. © 2004 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem 42: 5561–5573, 2004 相似文献
16.
Shohei Inoue 《高分子科学杂志,A辑:纯化学与应用化学》2013,50(5):651-664
Carbon dioxide and epoxide copolymerize in the presence of some organometallic catalyst systems under moderate conditions to give aliphatic polycarbonates of high molecular weight. Some metalloporphyrins of aluminum and zinc were found to act as novel catalysts for the polymerization of epoxide and for the copolymerization of carbon dioxide and epoxide, though not alternating. The polymers are characterized by the narrow molecular weight distribution and the unusual stereoregularity. Starting from the copolymerization of carbon dioxide and trimethylsilyl glycidyl ether with diethylzinc-water catalyst system, a readily degradable polycarbonate having hydroxyl group was obtained. 相似文献
17.
The copolymerization of 2-(3,4-epoxycyclohexyl)ethyl-trimethoxysilane and carbon dioxide catalyzed by (salen)Cr(III)Cl (H(2)salen = N,N'-bis(3,5-di-tert-butylsalicylidene)-1,2-ethylenediimine) with 2.5 equiv of N-MeIm as cocatalyst affords a polycarbonate devoid of polyether linkages, along with only a trace quantity of cyclic carbonate. The presence of the trimethoxysilane functionality in the epoxide not only provided the reactant monomer and product copolymer high solubility in liquid carbon dioxide but also provided the ability to cross-link the copolymer and thereby greatly alter the physical properties of the thus formed polycarbonate. In addition, the enhanced solubility of the copolymer in liquid CO(2) furnishes a ready means of removing the highly colored metal catalyst from the polycarbonate product. 相似文献