Preparation and characterization of new difunctional cationic radical initiator-montmorillonite hybrids
Preparation and characterization of new difunctional cationic radical initiator-montmorillonite hybrids
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新型双官能团阳离子自由基引发剂-蒙脱石杂化物的制备及表征
DOI：
10.1016/j.colsurfa.2004.08.014
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发表时间：
2004
期刊：
影响因子：
--
通讯作者：
Youn
中科院分区：
文献类型：
--
作者：
P. Uthirakumar;Cheol Kim;K. Nahm;Y. Hahn;Youn
由 2,2'-偶氮双[2-甲基-N-(2-羟乙基)]丙酰胺合成了三种不同的含有季铵部分的自由基偶氮引发剂。通过阳离子交换将这些引发剂嵌入蒙脱石（MMT）的孔道中，以获得自由基引发剂-MMT杂化物。偶氮引发剂具有双重功能：将MMT改性为亲有机物，并引发乙烯基单体的聚合。粘土通道中插层引发剂的尺寸与其相应引发剂-MMT 混合物的层间 d 间距密切相关。还针对各种极性和非极性单体测试了引发剂-MMT 杂化物的溶胀。基于层间d-间距和杂化物的溶胀，发现2,2'-偶氮双{2-甲基-N-[2-乙酰氧基-(2-N,N,N-三丁基溴化铵)乙基]丙酰胺}-MMT是测试的自由基引发剂-MMT杂化物中最好的，特别是对于非极性单体。
Three different radical azo-initiators, containing quaternary ammonium moieties, were synthesized from 2,2′-azobis[2-methyl-N-(2-hydroxyethyl)] propionamide. These initiators were intercalated into the galleries of montmorillonite (MMT), via cationic exchange, in order to obtain the radical initiator-MMT hybrids. The azo-initiators have dual functions: modifying MMT to be organophilic, and initiating the polymerization of vinylic monomers. The sizes of the intercalated initiators in the clay galleries were closely related to the interlayer d-spacing of their corresponding initiator-MMT hybrid. The swelling of the initiator-MMT hybrids was also tested towards various polar and non-polar monomers. Based on the interlayer d-spacing, and the swelling of the hybrids, 2,2′-azobis{2-methyl-N-[2-acetoxy-(2-N,N,N-tributylammonium bromide) ethyl] propionamide}-MMT was found to be the best of the radical initiator-MMT hybrids tested, especially for the non-polar monomers.