固液界面多分散高分子吸附

采用构作配分函数而后求极值的方法,将Scheutjens-Fleer模型推广到多分散高分子吸附情形,并采用适当的计算方法,解决了长期以来人们难以解决的多分散高分子模型计算上的困难,研究了固液界面区域多分散高分子的微观吸附行为、多分散指数对吸附层性质的影响以及各种微观构象的链段大小的几率分布.结果表明,相对分子质量大的高分子优先吸附于界面,多分散指数对吸附行为具有较大影响.

ADSORPTION OF POLYDISPERSE POLYMER AT SOLID/LIQUID INTERFACE

The Scheutjens - Fleer model on monodisperse polymer adsorption was extended to the situation of polydisperse polymer adsorption by the method of seeking the extremum of the partition function constructed for the system. Using a suitable calculation method, the authors obtained the numerical re-suits of the model which had been very difficult to solve before. The microscopic adsorption of the poly-disperse polymer at solid/liquid interface, the effects of the polydisperse index on the properties of the adsorption layer and the size distributions of train, loop and tail conformations were studied. It is shown that a polymer with a large molecular weight is adsorbed more favorably and that the polydisperse index affects the adsorption of polydisperse polymer largely.