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实验测得C_(12)TAB在PS胶乳粒子表面的吸附等温线呈L型的二阶段吸附特征,这表明初始的C_(12)TA~+离子是将其季铵正电性头基吸引在PS链的负电性硫酸根端基上,并将碳氢链通过疏水相互作用吸附在PS链上.结合光子相关谱测得胶乳粒子流体力学半径R_H的变化,表明第Ⅰ阶段围绕着这些初始吸附位的聚集吸附,产生平均聚集数为4.0的松散小聚集体,此时对应的浓度c/cmc=0.32是文献通常所指的临界表面胶团浓度csmc.其后的进一步聚集吸附最终生成了附着在PS链端基处且平均聚集数为19.5的球形吸附胶团.这一饱和吸附的结果增加了胶乳粒子在水溶液中的分散稳定性.
It was found that the adsorption isotherm of C_ (12) TAB on the surface of PS latex particle showed a L-type two-stage adsorption characteristic, indicating that the initial C_ (12) TA ~ + ion attracted its quaternary ammonium positron PS chains, and the hydrocarbon chains were adsorbed on the PS chains through hydrophobic interactions.The change of the hydrodynamic radius R_H of the latex particles was measured by photon correlation spectroscopy, indicating that the first phase around these initial adsorption The aggregates of the adsorbed sites produced loose aggregates with an average aggregation number of 4.0, at which time the corresponding concentration, c / cmc = 0.32, is the critical surface micelle concentration, csmc, commonly referred to in the literature. Subsequent further aggregation and adsorption eventually resulted in attachment The spherical adsorbed micelles at the end of the PS chain with an average agglomeration number of 19.5 resulted in an increase in the dispersion stability of the latex particles in aqueous solution.