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本文应用SAXS与微机模型拟合(MCMI)研究了S-LB(S为芪唑盐)薄膜与SA-LB(SA为芪唑盐/花生酸镉)薄膜的微观结构与超分子结构,以及这类LB薄膜凝聚态不稳定的原因.结果指出;第一,从π-A.曲线可知,S与A的脂肪链可以类似于脂肪酸晶胞形成二维类晶系结构;第二,随着分子比R_M=S/A=0到l,S和A之间发生了从分散相至连续相的相逆转;第三,S在二维类晶系中处于不稳定的近似伸直型的高能态构象,然而,哑铃形的芪唑基类似于芪趋向于作倾斜状密堆砌,S的两条脂肪链则倾向于转变为稳定的全反式燕尾形的低能态构象,仅占S分子长约2/3的脂肪链亦降低子S分子间与S-A分子间的凝聚力,这就导致了S连续相的二维类晶系存在大量晶格缺陷,故只能形成4～6层不稳定的Y型LB薄膜;第四,存放一月后,这种不稳定的S连续相的层状超分子结构极易破坏和崩塌.
In this paper, the microstructures and supramolecular structures of S-LB (S is a stilbazolium) film and SA-LB (SA is stilbazolate / arachidate) film were investigated by SAXS and computer modeling fit (MCMI) The results show that: firstly, from the π-A curve, the fatty chains of S and A can form two-dimensional crystal-like structure similar to fatty acid unit cell; secondly, The phase reversal from the dispersed phase to the continuous phase occurs between R = S / A = 0 to 1 and S and A; and thirdly, S is unstable in the two-dimensional crystal system in an approximately straight-forward high-energy state However, the dumbbell-shaped stilbazolyl group resembles the stilbenes tending to tilt closely and the two fatty chains of S tend to shift to a stable all-trans-doe-like low-energy conformation, accounting only for the S-molecule length Two-thirds of the fatty chains also reduce the cohesion between the daughter molecule and the SA molecule, resulting in a large number of lattice defects in the two-dimensional crystal system of the S continuous phase. Thus, only four to six unstable Y Type LB film; fourthly, after one month of storage, the lamellar supramolecular structure of this unstable S-continuous phase is easily damaged and collapsed.