Development of the Ultra Lubricant Films for the Hard Disk Using Polymer Langmuir-Blodgett Films

1. n -十八烷基丙烯酰胺（ODA） LB膜的Langmuir-Blodgett多层红外光谱测量（偏振透射和反射吸收光谱）表明，ODA分子取向几乎垂直于板表面；它们在平面上沿倾斜方向排列（面内顺序）。即ODA LB膜具有较高的双轴取向。观察到由ODA分子的大各向异性排列引起的剧烈的极化FT-IR二色性，而相应的丙烯酸酯衍生物则没有观察到这种现象。研究了聚n -十二烷基丙烯酰胺（pDDA）聚合物Langmuir-Blodgett膜的摩擦性能。两层pDDA LB膜的摩擦力比玻璃基板的摩擦力小4倍。pDDA LB薄膜的摩擦力在传递过程中也很稳定，滑动块的位移越大，而玻璃基板的摩擦力则随着传递次数的增加而增加。随着单分子层数的增加，动摩擦系数保持在0.2左右。结果表明，即使在一层高度有序的超薄pDDA LB膜上也会出现润滑现象。采用自由基聚合法制备了具有不同长度氟碳侧链的聚n -烷基丙烯酰胺单分子膜和Langmuir-Blodgett薄膜的涂膜行为。研究了两亲性聚合物单分子膜在空气-水界面的扩散行为。通过测量表面压力-面积等温线对LB膜的表征进行了研究。侧链长度对LB膜的扩散行为和形成有很强的依赖性，侧链短的（3个碳原子）形成膨胀单分子膜，侧链长的（7、8和10个碳原子）形成凝聚单分子膜。具有侧链（3,7和8个碳原子）的聚合物可以很容易地转移到固体衬底上，并且可以制备均匀的LB膜。少

1. A Highly Ordered Structure in N-Octadecylacrylamide Langmuir-Blodgett MultilayrsFT-IR spectroscopic measurements (polarized transmission and reflection absorption spectra) of N-octadecylacrylamide (ODA) LB films indicate that ODA molecules are oriented nearly perpendicular to the surface of the plate ; moreover they are ordered in the plane along the dipping direction (in-plane order). That is, ODA LB films have a high biaxial orientation. A drastic dichroism in polarized FT-IR caused by the large anisortropic arrangement of ODA molecules was observed, whereas that was not observed for the corresponding acrylate derivative.2. Frictional Properties of Polymer Langmuir-Blodgett Film for Poly (N-Dodecylacrylamide)Frictional properties of polymer Langmuir-Blodgett films of Poly (N-Dodecylacrylamide)(pDDA) are investigated. The frictional force for two monolayrs pDDA LB film is 4 times smaller than that of glass substrate. The frictional force for pDDA LB films is also stable during tran … More sit of the slider, whereas that for the glass substrate increases with the number of transits. The kinetic frictional coefficient remains about 0.2 with increasing number of monolayrs. It was demonstrated that lubricating phenomena appear even at one monolayr of highly ordered ultrathin pDDA LB films.3. Spreading Behavior of Monolayrs of Poly (N-alkylacrylamide) with Fluorocarbon Side Chains and Langmuir-Blodgett FilmsPoly (N-alkylacrylamide) with different lengths of fluorocarbon side chains were prepared by radical polymerization. The spreading behavior of the amphiphilic polymer monolayrs at the air-water interface was studied. The characterization of the LB films was also investigated by measurement of surface pressure-area isotherm. The spreading behaviors and the LB film formation were strongly dependent on the length of the side chains with a short side chain (3 carbon atoms) forms an expanded monolayr, while that with longer side chains (7,8 and 10 carbon atoms) forms a condensed monolayr. Polymers with side chains (3,7 and 8 carbon atoms) can be easily transferred onto solid substrates, and uniform LB films can be prepared. Less