Surface and Interface Structure and Tribological Properties of Hydrophilic Polymer Brushes
Surface and Interface Structure and Tribological Properties of Hydrophilic Polymer Brushes
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亲水性聚合物刷的表面和界面结构及摩擦学性能
DOI：
10.1678/rheology.36.107
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发表时间：
2008
影响因子：
1.3
通讯作者：
A. Takahara
中科院分区：
文献类型：
--
作者：
M. Kobayashi;H. Yamaguchi;Y. Terayama;Zhe Wang;M. Kaido;A. Suzuki;A. Takahara
以（2,2-二甲基-1,3-二恶olan-4-酰基）甲基丙烯酸甲酯（DMM）、2-甲基丙烯酰氧乙基磷酸胆碱（MPC）、2-二甲氨基甲基丙烯酸乙酯（DMAEMA）和醋酸乙烯酯（VAc）为原料，在引发剂固定硅片上通过表面原子转移自由基聚合制备了厚度为25-35 nm的亲水性聚合物刷。PDMM、PDMAEMA和PVAc分别转化为聚2,3-二羟基甲基丙烯酸丙酯（PDHMA）、聚2甲基丙烯氧基乙基三甲基碘化铵（PMETA）和聚乙烯醇（PVA）。用玻璃球探针在0.49 N的载荷下以90 mm/min的滑动速度在空气、水和甲苯中滑动，表征了亲水性聚合物刷的宏观摩擦性能。PDHMA、PMPC、PMETA和PVA刷体固定表面的动摩擦系数在水（好溶剂）条件下比在干燥空气条件下降低，而在甲苯（差溶剂）条件下则升高。PMPC电刷在潮湿环境下的摩擦系数极低，这是由于吸附在电刷表面的水分子起到了润滑剂的作用。利用胶体探针对高密度PMPC电刷的附着力进行了AFM测试。在较差的溶剂（乙醇/水= 75/25,v/v）中，与良好的溶剂（纯水）相比，观察到更大的附着力，这是因为在较差的溶剂中，刷子和探针之间的相互作用很强。这些结果表明，摩擦性能在很大程度上取决于溶剂质量和衬底与滑动探针之间的附着力。
The hydrophilic polymer brushes with 25-35 nm thick were prepared by surface-initiated atom transfer radical polymerization of (2,2-dimethyl-1,3-dioxolan-4-yl)methyl methacrylate (DMM), 2-methacryloyloxyethyl phosphorylcholine (MPC), 2-dimethylaminoethyl methacrylate (DMAEMA), and vinyl acetate (VAc) on the initiator-immobilized silicon wafer. PDMM, PDMAEMA, and PVAc were converted to poly(2,3-dihyroxypropyl methacrylate) (PDHMA), poly(2methacryloxyethyltrimethylammonium iodide) (PMETA), and poly(vinyl alcohol) (PVA), respectively. Macroscopic frictional properties of the hydrophilic polymer brushes were characterized by sliding a glass ball probe in air, water, and toluene under the load of 0.49 N at a sliding velocity of 90 mm/min. The dynamic frictional coefficient of the surfaces immobilized with PDHMA, PMPC, PMETA and PVA brushes were lowered in water (good solvent) compared with in dry air condition, while they increased in toluene (poor solvent). Extremely low friction coefficient of PMPC brush was observed in humid atmosphere because water molecules adsorbed into brush surface acted as a lubricant. Adhesion force measurement of high-density PMPC brush was also carried out by AFM using a colloidal probe. Larger adhesion force was observed in a poor solvent (ethanol/water = 75/25, v/v) compared with good solvent (pure water), because of strong interaction between a brush and a probe in a poor solvent. These results indicate that the frictional properties largely depend on the solvent quality and the adhesion force between the substrate and the sliding probe.
影响因子：
41.2
作者：
Moro, T;Takatori, Y;Kawaguchi, H
通讯作者：
Kawaguchi, H