Surface Effect on Frictional Properties for Thin Hydrogel Films of Poly(vinyl ether)
Surface Effect on Frictional Properties for Thin Hydrogel Films of Poly(vinyl ether)
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DOI：
10.1021/acs.macromol.9b01786
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发表时间：
2019-12
期刊：
影响因子：
5.5
通讯作者：
Nozomi Itagaki;D. Kawaguchi;Yukari Oda;Fumiya Nemoto;N. Yamada;Tetsuo Yamaguchi;Keiji Tanaka
中科院分区：
文献类型：
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作者：
Nozomi Itagaki;D. Kawaguchi;Yukari Oda;Fumiya Nemoto;N. Yamada;Tetsuo Yamaguchi;Keiji Tanaka
摩擦性能在水凝胶于诸如软性隐形眼镜、细胞片、人工关节软骨等应用中的性能方面起着关键作用。在此，我们利用中子反射率（NR）结合横向力显微镜，在纳米尺度上对由聚（2 - 甲氧基乙基乙烯基醚）组成的薄水凝胶膜的溶胀状态和摩擦性能进行了表征，进而讨论了表面链在多大程度上影响凝胶的摩擦性能。NR测量显示，水凝胶膜在与水的界面区域沿垂直于界面方向的密度分布可用抛物线函数很好地描述，该函数通常用于液体中溶胀的聚合物刷。横向力（即摩擦力FL）首先随着法向力（FN）的增加而增加，然后达到一个FL对FN的依赖性极其微小的区域。也就是说，对于FN和FL之间的关系存在两个区域，I和II。……
Frictional properties play a key role in the performance of hydrogels in applications such as soft contact lenses, cell sheets, artificial articular cartilage, etc. Here we characterize the swollen state and frictional properties of thin hydrogel films composed of poly(2-methoxyethyl vinyl ether) on a nanometer scale using neutron reflectivity (NR) in conjunction with lateral force microscopy, leading to the discussion about the extent to which surface chains impact the frictional properties of gels. NR measurement revealed that the density profile for the hydrogel films in the interfacial region with water along the direction normal to the interface was well described by a parabolic function, which was generally used for swollen polymer brushes in a liquid. Lateral, or frictional, force (FL) first increased with increasing normal force (FN) and then reached a region where the dependence of FL on FN was extremely subtle. That is, there exist two regimes, I and II, for the relationship between FN and FL. T...