聚合物单分子膜的表面动力学

The surface dynamics of polymer monolayer is an important topic in the theoretical and experimental researches. The statistical distribution of polymeric molecules at the solution-air interface is the basis to understand their properties. In the aspect of theory, it was found that it should modify the suggestion about average distribution of the segment adsorbed at the surface along the long chain, presented by de Gennes. The correct form of the distribution function for this non-terminal attached chain was deduced analytically in this project. Based on the theoretical result, we finished the computer simulations of the conformational distribution of the complex model, which is tail-train-loop of a chain at the surface. The case, in which the polymer chains are totally parallel or perpendicular to the surface, is only a particular extreme example. As the same time, we gave the simulations of the collapse transition of polymer at the surface layer. The new results for the self-avoiding walk terminally attached to the surface were expended for the two- and three-dimensional Manhattan lattice. The experimental part of this project concerns the surface pressure- area isotherms for the samples of sericin, protein from spider fiber, poly(ethylene oxide) and others. A simple method to determine the surface diffusion coefficient was suggested from the data of dynamic surface tensions of polymers. Based on the recent researches on the man-made spider fiber we have written a new book called " Nonafibers" published in Chinese.

购买关键部件，自行设计组装可用于聚合物单分子膜的表面粘度测定仪。测量两类典型高分子的单层的表面粘度：其一高分子链平行于表面，其二链垂直于表面。每一类中都选择合成几种有代表性的模型化合物，测定其单分子膜表面粘度与分子量、温度和形变速率等的关系。同时，进行相应的理论建立和计算机模拟。目标是深入理解高分子单层膜表面动力学。