Influence of molecular architecture on the adsorption of poly(ethylene oxide)-poly(propylene oxide)-poly(ethylene oxide) on PDMS surfaces and implications for aqueous lubrication
Influence of molecular architecture on the adsorption of poly(ethylene oxide)-poly(propylene oxide)-poly(ethylene oxide) on PDMS surfaces and implications for aqueous lubrication
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DOI：
10.1021/ma049076w
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发表时间：
2004-11-02
期刊：
影响因子：
5.5
通讯作者：
Spencer, ND
中科院分区：
文献类型：
--
作者：
Lee, S;Iten, R;Spencer, ND
我们研究了一系列聚环氧乙烷-聚环氧丙烷-聚环氧乙烷（PEO-PPO-PEO）嵌段共聚物（“Pluronic”）的吸附和润滑性能，以检验将其用作水性润滑剂添加剂的可行性。通过光波导光模式光谱（OWLS）研究了 PEO-PPO-PEO 在聚（二甲基硅氧烷）（PDMS）表面上的吸附行为。 PEO-PPO-PEO 共聚物的吸附量表现出系统变化，主要取决于 PPO 嵌段的配方重量，并且发现随着 PPO 嵌段尺寸的增加而增加。通过销盘摩擦测量法研究了共聚物的润滑性能，采用自交配 PDMS 作为水环境中的摩擦对。观察到 PEO-PPO-PEO 共聚物的润滑行为与其在 PDMS 表面上的吸附性能密切相关；对于那些表现出对 PPO 嵌段显着吸附的 PEO-PPO-PEO 共聚物，观察到在低速条件下的有效润滑，但也观察到 PEO 嵌段的显着作用。 PEO-PPO-PEO 共聚物在水性介质中的润滑能力归因于通过用共聚物涂覆表面并促进在滑动界面处形成水性润滑膜来减少PDMS表面之间的疏水相互作用。
We have investigated the adsorption and lubrication properties of a series of poly(ethylene oxide)-poly(propylene oxide) -poly(ethylene oxide) (PEO-PPO-PEO) block copolymers ("Pluronic") to examine the feasibility of using them as aqueous lubricant additives. The adsorption behavior of PEO-PPO-PEO onto poly(dimethylsiloxane) (PDMS) surfaces was studied by optical waveguide lightmode spectroscopy (OWLS). The amount of adsorbed PEO-PPO-PEO copolymer exhibited a systematic variation, mainly according to the formula weight of the PPO block, and was found to increase with increasing PPO block size. The lubricating properties of the copolymers were investigated by means of pin-on-disk tribometry, employing self-mated PDMS as a tribo-pair in an aqueous environment. The lubricating behavior of the PEO-PPO-PEO copolymers was observed to be closely associated with their adsorption properties onto the PDMS surface; effective lubrication under low-velocity conditions was observed for those PEO-PPO-PEO copolymers that exhibited a significant adsorption of the PPO block, yet a significant role of the PEO block was also observed. The lubrication capabilities of PEO-PPO-PEO copolymers in aqueous media were attributed to the reduction of the hydrophobic interaction between PDMS surfaces by coating the surface with the copolymer and facilitating the formation of an aqueous lubricating film at the sliding interface.