Synthesis of novel tempera-ture/pH responsive polymer via oxyanionic polymerization  

作　　者：NI Peihong CAO Xinpei VAN Deyue HOU Jian FU Shoukuan 

机构地区：[1]College of Chemistry and Chemical Engineering,Shanghai Jiaotong University,Shanghai 200240,China [2]Department of Chemical Engineering,Suzhou University,Suzhou 215006,China [3]Department of Polymer Science.Fudan University,Shanghai 200433,China

出　　处：《Chinese Science Bulletin》2002年第4期280-283,共4页

基　　金：This work was supported by the National Natural Science Foundation of China (Grant No. 29974017).

摘　　要：Hyperbranched poly(3-ethyl-3-oxetanemetha-nol)-graft-poly(2-dimethylaminoethyl methacrylate) (HP-g-DMA) with a three-demensional structure was synthesized via oxyanionic polymerization. The hydroxyl groups of hyper-branched poly(3-ethyi-3-oxetanemethanol) (HP) reacted with KH and conversed into potassium alcoholate macroinitiators with high initiating efficiencies. High monomer conversion (】95%) was obtained and no residual macroinitiators or monomer was observed. UV-visible spectra indicate that the aqueous solution of the HP-g-DMA exhibited the lowermost critical solution temperature (LCST). The LCST was influ-enced by the chain length of DMA and pH condition of solu-tion. It is found that LCST decreased with increasing DMA chain length or increasing pH value of solution.Hyperbranched poly(3-ethyl-3-oxetanemethanol)-graft-poly (2-dimethylaminoethyl methacrylate) (HP-g-DMA) with a three-demensional structure was synthesized via oxyanionic polymerization. The hydroxyl groups of hyperbranched poly(3-ethyl-3-oxetanemethanol) (HP) reacted with KH and conversed into potassium alcoholate macroinitiators with high initiating efficiencies. High monomer conversion (>95%) was obtained and no residual macroinitiators or monomer was observed. UV-visible spectra indicate that the aqueous solution of the HP-g-DMA exhibited the lowermost critical solution temperature (LCST). The LCST was influenced by the chain length of DMA and pH condition of solution. It is found that LCST decreased with increasing DMA chain length or increasing pH value of solution.

关 键 词：oxyanionic polymerization temperature/pH RESPONSIVE POLYMER lowermost critical solution temperature. 

分 类 号：O631[理学—高分子化学]