聚氧乙烯-聚氧丙烯嵌段共聚物加溶作用的研究

STUDY ON SOLUBILIZATION OF THE POLYOXYETHYLENE-POLYOXYPROPYLENE BLOCK COPOLYMER

本文对聚氧乙烯-聚氧丙烯嵌段共聚物Pluronic的加溶性质和机制进行了研究.结果表明仅有合适的HLB值的样品才具有加溶作用.L64的水溶液对芳烃有加溶作用,对烷烃几乎没有.随温度升高,发生加溶作用的L64最小浓度下降.此外,水也能被加溶在L64的二甲苯溶液中.加溶有水的反胶团的大小比加溶有二甲苯的正胶团要大得多.紫外光谱与核磁共振谱的研究表明,对于PPO-PEO嵌段共聚物,被加溶的二甲苯插在胶团内部的PPO链段之间。

The nature and mechanism of solubilization of the block copolymer of polyoxye-thylene-polyoxypropylene glycols-Pluronic were investigated and the results showedthat only the samples with appropriate HLB value were valid for solubilization. Inaqueous solution of L64 the aromatic hydrocarbon could be solubilized, while thealkanes almost could not. The lowest concentration of L64 for solubilization decreasedwith the increase of the temperature. Water could also be solubilizated in the xylene solution of L64. The size of theinverse micelles of solubilized water was much bigger than that of the micelles ofsolubilized xylene. Ultraviolet and NMR spectroscopic studies showed that the xylene and toluenewere included into the polyoxypropylene chains at the interior of the micelles for thePPO-PEO block copolymer.