Department of Chemistry, Lehigh University, Bethlehem, Pennsylvania 18015, United States.
Langmuir. 2012 Mar 13;28(10):4614-7. doi: 10.1021/la204985d. Epub 2012 Feb 29.
Polymeric surfactants were prepared by quaternization of poly(4-chloromethylstyrene) with N,N-dimethyl-N-n-dodecylamine and N,N-dimethyl-N-n-octylamine to give 1 and 2, respectively. Each of these polymers formed stable monolayers at the air/water interface. Injection of poly(acrylic acid) (PAA) beneath the surface of these films led to a substantial increase in their cohesiveness (i.e., "gluing"), as evidenced by a dramatic increase in their surface viscosity. Examination of monolayers of 1 by atomic force microscopy, after being transferred to silicon wafers that were surface-modified with n-octadecyltrichlorosilane, showed that the presence of PAA leads to intact film. In contrast, transfer of unglued monolayers resulted in poor coverage. Comparison of the barrier properties of single glued and unglued LB bilayers formed in the presence and in the absence of PAA have shown that PAA minimizes defect formation within these ultrathin assemblies.
通过用 N,N-二甲基-N-十二烷基胺和 N,N-二甲基-N-辛基胺季铵化聚(4-氯甲基苯乙烯)，分别得到了 1 和 2。这些聚合物中的每一种都在空气/水界面形成了稳定的单层。向这些薄膜的表面下注入聚丙烯酸 (PAA) 会导致它们的内聚性（即“胶合”）显著增加，这可以通过它们的表面粘度的急剧增加来证明。通过原子力显微镜对转移到用十八烷基三氯硅烷表面修饰的硅晶片上的 1 的单层进行检查表明，PAA 的存在会导致完整的薄膜。相比之下，未胶合的单层的转移会导致覆盖率不佳。比较了在存在和不存在 PAA 的情况下形成的单胶合和未胶合 LB 双层的阻挡性能，结果表明 PAA 最大限度地减少了这些超薄组件内缺陷的形成。
