新型两亲性聚合物负载型TEMPO催化剂的相界面行为及其催化性能的研究
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- 英文论文题名：Interfacial Behavior and Catalytic Activity of Novel Amphiphilic Polymer-Supported TEMPO
- 论文作者：汤骏 ; 陈良 ; 张祺 ; 王建黎
- 英文论文作者：Jun Tang ; Liang Chen ; Qi Zhang ; Jianli Wang ; College of Chemical Engineering ; Zhejiang University of Technology
- 年：2016
- 作者机构：浙江工业大学化学工程学院;
- 论文关键词：高分子催化剂 ; 负载型TEMPO ; Pickering乳液 ; pH响应
- 会议召开时间：2016-07-01
- 会议录名称：中国化学会第30届学术年会摘要集-第十五分会：表界面结构调控与催化
- 语种：中文
- 分类号：O643.36
- 学会代码：ZGHY
- 会议名称：中国化学会第30届学术年会-第十五分会 ; 表界面结构调控与催化
- 会议地点：中国辽宁大连
- 主办单位：中国化学会
- 学会名称：中国化学会
- 页数：1
- 文件大小：334k
- 原文格式：D
- 会议级别：全国
摘要
将2,2,6,6-四甲基哌啶-氮氧自由基(TEMPO)通过咪唑共价桥连负载于氯甲基聚醚砜(CMPES)侧链,制备出一种两亲性的聚合物负载型TEMPO催化剂(PES-im-TEMPO)。该高分子催化剂不溶于水和二氯甲烷,但可在二氯甲烷溶剂中组装形成粒径均一的纳米颗粒(69±9 nm);用于Anelli氧化体系催化氧化有机醇时,搅拌作用下聚合物纳米颗粒会自发吸附、稳定在油/水两相界面上,阻止分散液滴的聚并,形成w/o型的Pickering乳液,大幅度提高反应效率。咪唑结构赋予该催化剂一定的p H响应性能力,通过调节水相p H值,可使纳米颗粒从两相乳液界面解吸、析出沉淀,经过滤分离实现催化剂的回收。
We prepared amphiphilic polymer-supported TEMPO catalyst(PES-im-TEMPO) through anchoring 2,2,6,6-tetramethylpiperidine-1-oxyl(TEMPO) onto chloromethyl poly(ether sulfone)(CMPES) bridged by imidazole groups.PES-im-TEMPO was not soluble in either water or CH2Cl2,but it could be well-dispersed in CH2Cl2 and self-assembled into nanoaggregates with uniform size(69 ± 9 nm).When used in Anelli oxidation system,magnetic stirring can make these nanoparticles spontaneously be absorbed on biphasic interface to stabilize water in oil(w/o) Pickering emulsion and prevent droplets coalescence,leading to prominent improve on reaction rate.Moreover,the catalyst can be quickly separate and recycle from biphasic interface by tuning p H value of aqueous phase.
We prepared amphiphilic polymer-supported TEMPO catalyst(PES-im-TEMPO) through anchoring 2,2,6,6-tetramethylpiperidine-1-oxyl(TEMPO) onto chloromethyl poly(ether sulfone)(CMPES) bridged by imidazole groups.PES-im-TEMPO was not soluble in either water or CH2Cl2,but it could be well-dispersed in CH2Cl2 and self-assembled into nanoaggregates with uniform size(69 ± 9 nm).When used in Anelli oxidation system,magnetic stirring can make these nanoparticles spontaneously be absorbed on biphasic interface to stabilize water in oil(w/o) Pickering emulsion and prevent droplets coalescence,leading to prominent improve on reaction rate.Moreover,the catalyst can be quickly separate and recycle from biphasic interface by tuning p H value of aqueous phase.
引文
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[2]Feng,L.B.;Wang,J.L.;Chen,L.;Lu,M.Z.et al.Chem Cat Chem.2015,7:616.