Adsorption of Polyampholytes

鲁宾斯坦带电聚合物由于其独特的性能和在流变改性剂、分散剂、稳定剂、胶凝剂、粘结剂等方面的技术重要性，近年来引起了人们的广泛关注。多两性聚合物是同时携带正电荷和负电荷的聚合物。只带正电荷或负电荷的聚合物称为聚电解质。多两性电解质（如蛋白质）的净电荷是由水溶液的pH值决定的。远距离库仑相互作用是这些聚合物体系丰富行为的原因，也是发展描述它们的理论困难的原因。虽然聚电解质及其与表面相互作用的连贯图景开始出现，但对聚电解质的理论描述远远落后。特别是，目前尚无令人满意的聚两性聚合物吸附理论。这样的理论对于理解由多两性聚合物稳定的乳胶颗粒相互作用的细节、蛋白质在细胞膜上的吸附、多两性聚合物与聚电解质的络合以及相关问题是必要的。在目前的研究中，将建立和求解聚两性电解质在带电表面吸附的解析模型和数值模型。所讨论的问题将包括：单聚两性酯链的吸附，多链吸附，以及聚两性酯吸附动力学。带电聚合物由于其独特的性能和作为流变改性剂、分散剂、稳定剂、胶凝剂、粘结剂等技术的重要性，近年来引起了人们的广泛关注。多两性聚合物是同时携带正电荷和负电荷的聚合物。只带正电荷或负电荷的聚合物称为聚电解质。多两性电解质（如蛋白质）的净电荷是由水溶液的pH值决定的。远距离库仑相互作用是这些聚合物体系丰富行为的原因，也是发展描述它们的理论困难的原因。虽然聚电解质及其与表面相互作用的连贯图景开始出现，但对聚电解质的理论描述远远落后。特别是，目前尚无令人满意的聚两性聚合物吸附理论。这样的理论对于理解由多两性聚合物稳定的乳胶颗粒相互作用的细节、蛋白质在细胞膜上的吸附、多两性聚合物与聚电解质的络合以及相关问题是必要的。在目前的研究中，将建立和求解聚两性电解质在带电表面吸附的解析模型和数值模型。所讨论的问题将包括：单聚两性酯链的吸附，多链吸附，以及聚两性酯吸附动力学。＊＊＊

9730777 Rubinstein Charged polymers have recently attracted much attention due to their unique properties and their technological importance as rheology modifiers, dispersing aids, stabilizers, gelling agents, binders, etc. Polyampholytes are polymers carrying both positive and negative charges. Polymers carrying only positive or negative charge are called polyelectrolytes. The net charge of polyampholytes, e.g., proteins, is determined by the pH of the aqueous solution. Long-range Coulomb interactions are responsible for the rich behavior of these polymeric systems and for the difficulties in developing theories to describe them. While the coherent picture of polyelectrolytes and their interactions with surfaces is beginning to emerge, the theoretical description of polyampholytes is lagging far behind. In particular, there is no satisfactory theory of polyampholyte adsorption. Such a theory is necessary for understanding the details of interactions of latex particles stabilized by polyampholytes, adsorption of proteins on cell membranes, complexation of polyampholytes with polyelectrolytes and related problems. In the current research both analytical and numerical models of polyampholyte adsorption on charged surfaces will be constructed and solved. The problems addressed will include: the adsorption of a single polyampholyte chain, multi-chain adsorption, and the kinetics of polyampholyte adsorption. %%% Charged polymers have recently attracted much attention due to their unique properties and their technological importance as rheology modifiers, dispersing aids, stabilizers, gelling agents, binders, etc. Polyampholytes are polymers carrying both positive and negative charges. Polymers carrying only positive or negative charge are called polyelectrolytes. The net charge of polyampholytes, e.g., proteins, is determined by the pH of the aqueous solution. Long-range Coulomb interactions are responsible for the rich behavior of these polymeric systems and for the difficulties in developing theories to describe them. While the coherent picture of polyelectrolytes and their interactions with surfaces is beginning to emerge, the theoretical description of polyampholytes is lagging far behind. In particular, there is no satisfactory theory of polyampholyte adsorption. Such a theory is necessary for understanding the details of interactions of latex particles stabilized by polyampholytes, adsorption of proteins on cell membranes, complexation of polyampholytes with polyelectrolytes and related problems. In the current research both analytical and numerical models of polyampholyte adsorption on charged surfaces will be constructed and solved. The problems addressed will include: the adsorption of a single polyampholyte chain, multi-chain adsorption, and the kinetics of polyampholyte adsorption. ***