树状高分子PPI水溶液性质的研究

树状高分子是一种新型三维合成高分子，由于其分子量分布很窄，分子具有很高的规整性，可作为理论研究的模型，这类分子具有特殊的高度支化结构，内部存在大量的空腔，表面密布大量的官能团，因此存在很多潜在的用途，近十几年来在国内外得到了广泛的重视和研究，由于上述原因，它们的许多都与线性高分子有很大差异，故在溶液性质方面也有很大的区别，程Rong时等最近提出一种用于研究高分子溶液在毛细管中流动行为的新理论－－吸附理论，在线性高分子溶液中得到很好的验证，本文对树状高分子PPI（聚丙撑亚胺）水溶液尤其是在极稀溶液范围内进行了较深入的研究，不仅验证了吸附理论的适用性，还意外地观测到了动态接触浓度。

Investigation on Aqueous Solution Properties of Dendrimer PPI

Aqueous solution properties of dendrimer PPI［Poly(propylene imine)］ were studied by measuring viscosity parameters. Particularly on the extremely dilute concentration region were focused on. The adsorption constant k, critical concentration ca, intrinsic viscosity［η］, intermolecular association constant Km and hydrodynamic contact concentration cs were calculated. And the generation number dependence of these parameters were also studied. From the results, the unique behavior of dendrimer solution was explained preliminary. The adsorption phenomenon of polymer solution is general, and the adsorption theory is also fit for dendrimers. Furthermore, the dynamic contact concentration cs was determined by a simple viscosity method for the first time.