光诱导电子转移—可逆加成断裂链转移聚合的探究

发布时间：2018-06-06 11:56

本文选题：活性自由基聚合 + 光氧化还原催化　；参考：《中国科学技术大学》2016年硕士论文

【摘要】：光诱导活性自由基聚合在最近几年受到了广泛的关注。反应可以在室温下进行,光的来源广泛,并且具备环境友好性。自从2008年MacMillan报道Ru(bpy)3CI2光氧化还原醛类分子间的烷基化后,许多人开始尝试光氧化还原催化活性自由基聚合。Boyer和他的合作者发展了一种有效方便的光诱导活性自由基聚合,即光诱导电子转移-可逆加成断裂链转移(PET-RAFT)聚合。这种聚合方法适用的单体范围广,所得的聚合物结构控制很好并且分子量分布很窄。光氧化还原催化剂,如fac-[Ir(ppy)3]、Ru(bpy)3Cl2、锌卟啉、叶绿素、曙红Y和荧光素等被开发用于PET-RAFT聚合中。二氧化钛是一种半导体金属氧化物,被广泛的应用于污水处理、光伏电池和有机合成等领域。二氧化钛价格低廉,容易获得,无毒并且通过过滤就可以除去。Hynd Remita利用六方相模板法制备了纳米聚(1,4-二苯基丁二炔)(nanoPDPB)纤维。PDPB是一种一维共轭聚合物,具有很好的电化学、电学和光学特性。在光的激发下,这两类物质都可以产生价带电子(e-)和导带空穴(h+)。它们是高效的光氧化还原催化剂。二氧化钛或者nanoPDPB光氧化还原催化光诱导电子转移-可逆加成断裂链转移聚合成功实施。它们均可以很好的控制聚合物的分子量以及分子量分布。
[Abstract]:Photoinduced active radical polymerization has received extensive attention in recent years. Reactions can take place at room temperature, with a wide range of light sources and environmental friendliness. Since MacMillan reported on the alkylation of Ruhbpy3CI2 between molecules of photoredox reductive aldehydes in 2008, many people have begun to try photoredox catalytic radical polymerization. Boyer and his collaborators have developed an effective and convenient photo-induced active radical polymerization. That is, photoinduced electron transfer and reversible addition break chain transfer (PET-RAFT) polymerization. This polymerization method is suitable for a wide range of monomers, the polymer structure is well controlled and the molecular weight distribution is very narrow. Photoredox catalysts, such as fac- [Irppy3] Rubpy3Cl2, zinc porphyrin, chlorophyll, eosin Y and fluorescein, have been developed for PET-RAFT polymerization. Titanium dioxide is a semiconductor metal oxide, which is widely used in wastewater treatment, photovoltaic cells and organic synthesis. Titanium dioxide is cheap, easy to obtain, non-toxic and can be removed by filtration. Hynd Remita was prepared by hexagonal templating method to prepare nanopoly (1-diphenyl-4-diphenylbutyl diacetylene) nanoPDPB-based fiber. PDPB is a kind of one-dimensional conjugated polymer with excellent electrochemical properties. Electrical and optical properties. Under the excitation of light, both kinds of substances can produce valence band electron (e-) and conduction band hole. They are efficient photoredox catalysts. Photo-induced electron transfer and reversible addition of titanium dioxide or nanoPDPB photoredox catalytic polymerization were successfully carried out. They can well control the molecular weight and molecular weight distribution of the polymer.
【学位授予单位】：中国科学技术大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：O631.5

【相似文献】