羧甲基纤维素系列高分子表面活性剂在溶液中胶束行为的研究

本文通过激光光散射、紫外光谱、分光光度计和表面张力研究了羧甲基纤维素与烷基醇聚氧乙烯醚丙烯酸酯的超声共聚物在溶液中的临界胶束浓度、增溶作用和微乳液等胶束行为。结果表明：高分子表面活性剂虽然出现双临界胶束浓度现象，但在低浓度区仍存在多分子胶束；亲水链最长的大单体Ｒ１２ＥＯ２０Ａ及其共聚物对甲苯的增溶性最强，甲苯增溶在胶束的疏水内核中；共聚物水溶液与甲苯、异丙醇形成的微乳液与低分子乳化剂不同，表现出高分子表面活性剂的分子尺寸大和结构复杂的特征。

STUDIES ON MICELLAR BEHAVIOR OF CARBOXYMETHYL CELLULOSE BASED POLYMER SURFACTANTS IN AQUEOUS SOLUTION

The micelles in aqueous solution of the graft copolymers of carboxymethyl cellulose (CMC) with dodecylpolyoxyethylene acrylates (R 12 EO nA where n=3, 9, 20) prepared by ultrasonic copolymerization are studied by lazer light scattering, light transmission, UV spectrophotometry and surface/interface tension measurements.The results obtained show that for these polymer surfactants two critical micellar concentrations are observed and, however, no monomolecular micelles region appears. With the longest hydrophilic segment in molecule, copolymer CMC R 12 EO 20 A has the strongest micellar solubilizing effect for oil phase (toluene), which is solubilized in the hydrophobic cores of the micelles. The pseudo ternary phase diagrams of systems tolunene/aqueous solution/isopropanol for macromonomers and tercopolymers change in shape with changes in length of hydrophobic and hydrophilic segments.