Lateral Diffusion of Polymer

本研究旨在探讨聚合物在表面或界面上的Latel扩散机制。今年，我们继续进行FRAP仪器的建设和校准，并取得了以下成果.我们测量的扩散系数D的聚苯乙烯胶乳颗粒在水溶液中的非常薄的膜形状为100 μ m。该值与体相溶液动态光散射结果吻合较好.乳胶粒子吸附在玻璃表面的D值接近于零，即使在玻璃表面加水，D值也为零，说明乳胶粒子在玻璃表面的吸附较强.荧光染料的D_<**t>测量表明，回收率曲线不能用单指数函数描述，而是多指数函数.扩散系数可以在标记的聚苯乙烯-DBP溶液的100 μ m厚的膜上测量，并且我们试图在更薄的膜上获得D值。阐明了聚合物共混物和线状胶束的扩散机理，为今后的侧向扩散测量提供了理论依据.结果表明，FRAP仪器的研制是成功的。

This research is planned for investigation of the latel diffusion mechanism of polymers confined on surface or interface. This year, we continued construction and calibration of the FRAP instrument, and obtained following results.1. We measured the diffusion coefficient D of polystyrene latex particles in aqueous solutions with the very thin film shape of 100 mum. The value is in good agreement with a value obtained from dynamic light scattering on bulk solutions.2. The D value of the latex particle adsorbed on glass surface was nearly zero and also was zero even if the water is added on the surface, which indicates the particle is strongly adsorbed on the glass surface.3. The D_<**t> measurements of the fluorescent dye showed that the recovery curve can not be described by the single exponential but by the multi-exponential type of function.4. The diffusion coefficient can be measured on the 100 mum thick film of labeled polystyrene-DBP solution and we are trying to get D values on thinner film.5. We clarified diffusion mechanisms of polymer blend and threadlike micelles which are candidates for lateral diffusion measurement in future.6. The results show that construction of the FRAP instrument is sucessfully achieved.