The thin film structures and tribological properties of aqueous solutions of a silicone-based amphiphilic block copolymer, bis-isobutyl polyethylene glycol (PEG)-14/amodimethicone (BIPA) copolymer, confined between mica surfaces were investigated using the surface forces apparatus. Measurements were made for three BIPA concentrations (0.005, 0.05, and 0.5 wt%); the effect of concentration on the structures and properties was evaluated. The BIPA molecules had positive charges in the solutions and formed an adsorbed layer on a negatively charged mica surface. The static hard-wall thicknesses were within the range of 3.3–5.6 nm for the three concentrations. Applying sliding motions under load L further decreased the thickness. The minimum dynamic thicknesses were 2.4–2.7 nm for the three concentrations, indicative of sliding between two adsorbed BIPA molecular layers. The friction coefficients were on the order of 10⁻⁵ for the three concentrations; extremely low friction was obtained originating from the slippage of the fluid-like water layer between the adsorbed layers. All three concentrations exhibited good lubricity, but precise comparison implies some differences in the film structures and friction mechanisms. The details of the differences were discussed from the perspective of the dissolution states of BIPA in the solutions and adsorbed/sliding conformations.

使用表面力装置研究了限制在云母表面之间的基于有机硅的两亲性嵌段共聚物双异丁基聚乙二醇 (PEG)-14/氨基二甲基硅氧烷 (BIPA) 共聚物的水溶液的薄膜结构和摩擦学性能。测量了三种 BIPA 浓度（0.005、0.05 和 0.5 wt%）；评估了浓度对结构和性能的影响。BIPA 分子在溶液中带正电荷，并在带负电荷的云母表面形成吸附层。三种浓度的静态硬壁厚度在 3.3-5.6 nm 范围内。在负载L下应用滑动运动进一步降低了厚度。三种浓度的最小动态厚度为 2.4-2.7 nm，表明两个吸附的 BIPA 分子层之间存在滑动。三种浓度的摩擦系数约为10 ^-5；由于吸附层之间类似流体的水层的滑动，获得了极低的摩擦力。所有三种浓度都表现出良好的润滑性，但精确的比较意味着膜结构和摩擦机制存在一些差异。从BIPA在溶液中的溶解状态和吸附/滑动构象的角度讨论了差异的细节。