光响应性有机-无机杂化的分子印迹聚合物的制备及表征.docVIP

  光响应性有机-无机杂化的分子印迹聚合物 的制备及表征# 高超1，杨瑜珠1，黄勇2，唐倩1，龚成斌1** 5 10 15 20 25 30 35 40 （1. 西南大学化学化工学院，重庆 400715； 2. 重庆市巴蜀中学，重庆 400013） 摘要：以 4-硝基苯酚、2,4-二氯苯氧乙酸和 3-氯丙基三乙氧基硅烷为原料, 经氧化偶合、 酰化、酯化合成了共价结合模板分子 2,4-二氯苯氧乙酸(2,4-D)的光响应性含有机硅的偶氮 苯功能单体, 通过溶胶-凝胶法成功制备了光响应性的分子印迹聚合物(MIP). 研究了该分子 印迹聚合物光响应性能、对 2,4-D 的吸附性能和选择识别及光控释放与吸收能力, 用原子力 显微镜对其结构进行了表征, 制得的 MIP 材料具有规则的球形, 平均粒径在 150 nm — 200 nm 之间. 研究结果表明, MIP 对 2,4-D 具有良好的吸附和选择识别能力, MIP 材料在 365 和 440 nm 的紫外-可见光交替照射下, 可控制 2,4-D 的释放与吸收. 关键词：有机-无机杂化材料；2,4-二氯苯氧乙酸；光响应性有机硅偶氮苯；共价印迹；溶 胶-凝胶法 中图分类号：0635.2 Preparation and characterization of photoresponsive organic–inorganic hybrid molecularly imprinted polymers GAO Chao1, YANG Yuzhu1, HUANG Yong2, TANG Qian1, GONG Chengbin1 (1. College of Chemistry and Chemical Engineering, Southwest University, ChongQing 400715; 2. Basu Secondary school, ChongQing 400013) Abstract: In this paper, a photoresponsive functional azobenzene monomer containing silica was prepared by covalent imprinting for 2,4-dicholrophenoxyacetic acid (2.4-D) via oxidation-coupling reaction, acetylation and esterification reaction using commercially available p-nitrophenol, 2,4-dicholrophenoxyacetic acid and 3-chloropropyltriethoxysilane as the starting materials. Photo-responsive molecular imprinted polymer (MIP) for 2,4-D was then successfully prepared by sol-gel process. The photoresponsive properties, absorption abilities, selective recognition and photoregulated control the release and uptake for target molecule of MIP were also studied. As characterized by atomic force microscope, the morphology of MIP is sphere and the diameter of the spheres ranges in 150-200 nm. The experimental results show that MIP has a high adsorption capacity and good selective recognition for ２,4-D, and reversible uptake and release of 2.4-D upon alternate irradiation at 365 and 440 nm, respectively. Keywords: Organic-inorganic hybrid materials; 2,4-Dicholrophenoxyacetic acid; Photoresponsive Organic silica azobenzene; Covalent imprinting; Sol-gel 0 引言 2,4