MICELLIZATION OF AMPHIPHILIC STAR POLYMERS WITH POLY(ETHYLENE OXIDE) ARMS IN AQUEOUS-SOLUTIONS
MICELLIZATION OF AMPHIPHILIC STAR POLYMERS WITH POLY(ETHYLENE OXIDE) ARMS IN AQUEOUS-SOLUTIONS
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DOI：
10.1021/la00035a030
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发表时间：
1993-11-01
期刊：
影响因子：
3.9
通讯作者：
SMID, J
中科院分区：
文献类型：
--
作者：
ZHOU, GB;SMID, J
通过甲氧基聚乙二醇（MPEG）与三或四官能度异氰酸酯（简称T3 TMI和D4 TMI）反应，合成了具有大疏水核的三臂和四臂两亲性星星聚合物。后者是间异丙烯基-α，α-二甲基苄基异氰酸酯（m-TMI）分别与甲基三（二甲基甲硅烷氧基）硅烷和2，4，6，8-四甲基环四硅氧烷的氢化硅烷化产物。在水性介质中，星形物聚集，临界胶束浓度（cmc）为10（-4）M的数量级，其中Incmc与星形物的亲脂平衡（HLB）成比例。在不存在和存在盐的情况下测量浊点（T（p））。对于盐析电解质NaF和NaH_2PO_4，T（p）与摩尔盐浓度成正比。发现比例常数K（s）与星星的MPEG臂的长度成反比。
Well-defined three- and four-armed amphiphilic star polymers with a large hydrophobic core were made by the reaction of methoxypoly(ethylene glycol)s (MPEG) and tri- or tetrafunctional isocyanates abbreviated as T3TMI and D4TMI. The latter are the hydrosilylation products of m-isopropenyl-alpha,alpha-dimethylbenzyl isocyanate (m-TMI) with methyltris(dimethylsiloxy)silane and 2,4,6,8-tetramethylcyclotetrasiloxane, respectively. In aqueous media the stars aggregate, the critical micelle concentrations (cmc) being in the order of 10(-4) M, with In cmc being proportional to the hydrophile-lipophile balance (HLB) of the stars. Cloud points (T(p)) were measured in the absence and presence of salts. For the salting-out electrolytes NaF and NaH2PO4, T(p) is proportional to the molal salt concentration. The proportionality constant, K(s), is found to be inversely proportional to the length of the MPEG arm of the star.