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| NaNO2/FeSO4存在下聚苯乙烯大分子引发剂的合成及嵌段共聚 | |
| 引用本文： | 张恒君,许洪彬,赵雅辉,岳淑美,刘思东,崔秀君,马建方,苏忠民.NaNO2/FeSO4存在下聚苯乙烯大分子引发剂的合成及嵌段共聚[J].高等学校化学学报,2005,26(8):1541-1543. |
| 作者姓名： | 张恒君 许洪彬 赵雅辉 岳淑美 刘思东 崔秀君 马建方 苏忠民 |
| 作者单位： | 1. 东北师范大学化学学院功能材料化学研究所 2. 东北师范大学化学学院分析测试中心,长春,130024 |
| 基金项目： | 教育部跨世纪优秀人才培养计划;吉林省杰出青年科学基金 |
| 摘 要： | 用NaNO2/FeSO4·7H2O体系替代TEMPO在有机相中合成分子量可控的聚苯乙烯大分子引发剂,引发苯乙烯聚合及酯类单体如甲基丙烯酸甲酯(MMA)、丙烯酸甲酯(MA)和丙烯酸乙酯(EA)等]聚合,得到两嵌段共聚物.其多分散性指数小于1.5,体现了可控聚合的特征.用大分子引发剂引发苯乙烯进行活性链增长,单体的转化率较高.嵌段共聚物的实测分子量与理论分子量相近,结构经1HNMR和GPC表征.NaNO2/FeSO4·7H2O体系在纯有机相中的应用降低了活性聚合的成本,有利于工业化应用. |
| 关 键 词： | 聚苯乙烯 活性自由基聚合 嵌段共聚物 |
| 文章编号： | 0251-0790（2005）08-1541-03 |
| 收稿时间： | 06 8 2004 12:00AM |
| 修稿时间： | 2004-06-08 |
Fluorescence Spectroscopic Study on 2-(2-Pyridyl)imidazole at Different pH Values |
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| ZHANG Heng-Jun,XU Hong-bin,ZHAO Ya-Hui,YUE Shu-Mei,LIU Si-dong,CUI Xiu-jun,MA Jian-fang,SU Zhong-Min.Fluorescence Spectroscopic Study on 2-(2-Pyridyl)imidazole at Different pH Values[J].Chemical Research In Chinese Universities,2005,26(8):1541-1543. | |
| Authors: | ZHANG Heng-Jun XU Hong-bin ZHAO Ya-Hui YUE Shu-Mei LIU Si-dong CUI Xiu-jun MA Jian-fang SU Zhong-Min |
| Institution: | 1. Department of Chemistry, Quanzhou Normal College, Quanzhou 362000, China; 2. Department of Material Science and Engineering, Xiamen University, Xiamen 361005, China |
| Abstract: | 2-(2-Pyridyl)imidazole(2PI) was synthesized and the photophysical behavior in aqueous solution was studied in a wide range of acidity by steady-state fluorescence spectroscopy measurement. It was found that the intramolecular photoinduced electron transfer(PET) took place in the solution and the process strongly depended on the acidity of the solution and was affected by the protonation of nitrogen atoms. |
| Keywords: | 2-(2-Pyridyl)imidazole Fluorescence spectrum Intramolecular photoinduced electrontransfer pH effect |
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