新型磷酸酯两性表面活性剂的研究 Ⅱ.复配体系分子间相互作用

Study on New Amphoteric Surfactants of Phosphates Ⅱ.Molecular Interaction of Complexed Systems

用二元表面活性剂溶液的热力学，研究了ＲＨＥＰ－ＨＴＭＡＢ、ＲＨＥＰ－ＳＤＳ、ＲＨＥＰ－ＡＥＯｎ３种水溶液的混合体系中表面吸附层及胶束中表面活性剂分子间相互作用参数βｍ、βｓ及吸附层和胶束的组成。结果表明：（１）３种混合体系βｍ、βｓ值分别为：－１１．２１，－１１．２２；－８．２４，－１０．９６；－５．５，－２．０８。（２）随着烷基（Ｒ）碳链增长，βｍ值变小，但｜βｓ｜值出现极大值。（３）表面压越高，βｓ值越大。并对这些结果做了理论解释。

The three mixtures of RHEP-HTMAB,RHEP-SDS,RHEP-AEO n were investigated using the solution thermodynamics of the binary surfactants.Values of the molecular interaction parameters of the two surfactant molecules,β s at the adsorbed layer,β m in the mixed micelle,and consistence of the adsorbed layer and the micelle,were obtained.The results indicate that(1)the values of β m,β sof three mixtures decrease in the order:-11.21,-11.22;-8.24,-10.96;-5.5,-2.08;(2)the values of β m become more negative as the chain lengths of the alkyl groups in RHEP are increased,but the absolute value of β s appears to be maximum,when the lengths of the alkyl chains of the two surfactants are equal;(3)the higher the surface pressure,the greater the β s values.