Preparation of phase-transfer catalytic porous membrane by ¦Ã-ray irradiation grafting and its application in nucleophilic substitution reaction
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- 作者：Zhiqian Jia ; Tianli Zhen ; Xiaoqin Zhang ; Qingyang Gu
- 关键词：Liquid&ndash ; liquid reaction ; Polyethylene membrane ; ¦Ã-ray irradiation grafting ; Phase-transfer catalysis ; Nucleophilic substitution reaction
- 刊名：Journal of Membrane Science
- 出版年：2013
- 出版时间：15 December, 2013
- 年：2013
- 卷：448
- 期：Complete
- 页码：74-80
- 全文大小：1071 K
文摘
Phase-transfer catalytic porous polyethylene membranes, prepared by ¦Ã-ray irradiation grafting of 4-vinyl pyridine and quaternization, were tested in nucleophilic substitution reaction. The effects of grafting conditions (irradiation dose, 4-vinyl pyridine concentration) and quaternization parameters (temperature, time, concentration of reagent) were investigated. It was found that, the grafting degree initially increases with irradiation dose or 4-vinyl pyridine concentration and then decreases. The ion exchange capacity and quaternization ratio of membranes rise with quaternization temperature, time, and reagent concentration. The quaternized membranes exhibit good phase-transfer activity in nucleophilic substitution reaction between n-bromooctane and KI aqueous solution. The n-bromooctane conversion and the observed reaction rate constant rise with the increase in ion exchange capacity of membranes or reaction temperature. This paper provides a novel and promising method for phase transfer catalysis.