Fiber and Polymer Science Program and Department of Textile Engineering, Chemistry and Science, North Carolina State University, Raleigh, North Carolina 27695, USA.
ACS Appl Mater Interfaces. 2012 Jan;4(1):87-95. doi: 10.1021/am200917h. Epub 2011 Dec 19.
The MesoDyn method is used to investigate associative structures in aqueous solution of a nonionic triblock copolymer consisting of poly(propylene oxide) capped on both ends with poly(ethylene oxide) chains. The effect of adsorbing (hydrophobic) and nonadsorbing (hydrophilic) solid surfaces in contact with aqueous solutions of the polymer is elucidated. The macromolecules form self-assembled structures in solution. Confinement under shear forces is investigated in terms of interfacial behavior and association. The formation of micelles under confinement between hydrophilic surfaces occurs faster than in bulk aqueous solution while layered structures assemble when the polymers are confined between hydrophobic surfaces. Micelles are deformed under shear rates of 1 μs(-1) and eventually break to form persistent, adsorbed layered structures. As a result, surface damage under frictional forces is prevented. Overall, this study indicates that aqueous triblock copolymers of poly(ethylene oxide) (PEO) and poly(propylene oxide) (PPO) (Pluronics, EO(m)PO(n)EO(m)) act as a boundary lubricant for hydrophobic surfaces but not for hydrophilic ones.
MesoDyn 方法用于研究由聚（氧化丙烯）两端封端的聚（氧化乙烯）链组成的非离子三嵌段共聚物在水溶液中的缔合结构。阐明了与聚合物水溶液接触的吸附（疏水性）和非吸附（亲水性）固体表面的影响。大分子在溶液中形成自组装结构。从界面行为和缔合的角度研究了剪切力下的约束。在亲水表面之间的约束下形成胶束的速度比在本体水溶液中快，而当聚合物在疏水性表面之间约束时，则组装层状结构。在剪切速率为 1 μs(-1) 下，胶束变形，最终破裂形成持久的、吸附的层状结构。因此，防止了摩擦下的表面损伤。总的来说，这项研究表明，聚（氧化乙烯）（PEO）和聚（氧化丙烯）（PPO）（Pluronics，EO(m)PO(n)EO(m)）的水性三嵌段共聚物是疏水性表面的边界润滑剂，但不是亲水性表面的边界润滑剂。
