微波无极灯下瓜环的光聚合反应及其聚合物对染料的吸附性能

Synthesis of polymer cucurbituril under microwave electrodeless lamp and its property of dye absorption

在微波无极灯条件下,研究烯氧基瓜环和1,2-乙二硫醇发生光聚反应的反应动力学,并考察光敏剂对聚合反应的影响。聚合反应动力学结果表明,瓜环聚合反应符合一级动力学方程;当反应物烯氧基瓜环与乙二硫醇的投加量比为0.211时,巯基的转化率最高且为18.40%,且当反应物投料比小于0.211时,反应过程中可不添加光敏剂。此外,瓜环基聚合物对亚甲基蓝的吸附性能研究表明,吸附过程符合准二级吸附动力学方程,颗粒内扩散过程是该吸附速率的主要控制步骤,但不是唯一的速率控制步骤;其等温吸附平衡更符合Langmuir模型,相关系数R2为0.9986。对比聚合物吸附前后的红外光谱可知,亚甲基蓝通过配位方式吸附到瓜环聚合物上,瓜环的羰基参与了配位。

Polymer were directly synthesized by（allyloxy）lzcucurbit[6]uril with 1,2-ethanedithiol under UV irradi- ation emitted by microwave electrodeless lamps. And the kinetics of this reaction was studied. At the same time, the influ- ence of photosensitizer on the polymerization was investigated. The results of polymerization reaction kinetics showed that the reaction conformed to the first-order kinetic equation. When the reactant ratio between（allyloxy）12 cucurbit[6] uril and 1,2-ethanedithiol was 0. 211, the highest conversion rate of sulfhydryl group was 18. 40%. And when the reactant ratio was less than 0. 211, the reaction need not add photosensitizer. The adsorption of methylene btue on polymer was studied. The kinetics datas were fitted using the intraparticle diffusion model and pseudo-second-order kinetic model. And intraparticle diffusion was the main rate-coontrolling step for the adsorption of dye onto polymer. The adsorption data fired the Lang- muir adsorption isotherm,and the correlation coefficient R2 was 0. 9986. Infrared spectra indicated that adsorption was via the carbonyl groups of polymer which presented complex with methylene hl,lo