Conformation and Kinetics in Polyelectrolyte Adsorption

聚电解质吸附的构象和动力学

• 批准号: 9414289
• 负责人: Joseph Schlenoff
• 金额: $ 23.25万
• 依托单位: Florida State University
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1994
• 资助国家: 美国
• 起止时间: 1994-12-01 至 1998-05-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9414289&HistoricalAwards=false
• 关键词: Conformation; Kinetics; Polyelectrolyte; Adsorption

9414289 Schlenoff Kinetics and isotherms of the adsorption of polyelectrolytes to solid/liquid and liquid/liquid interfaces will be investigated. Metal surfaces derivatized with surface-attached redox groups will be employed to control the surface charge precisely in an effort to relate polymer conformation and coverage to surface charge density. These "smart" redox-active surfaces will be used to ascertain whether adsorption falls under thermodynamic or kinetic control. Radiolabelled hydrophilic/hydrophobic copolymers, such as styrene sulfonate/butyl styrene, will be synthesized and their adsorption at the interface between two immiscible liquids will be studied. For adsorbed polyelectrolytes, the dependence of average coil radius on salt concentration will be measured and compared with the well-known dependence of solution polyelectrolyte dimensions on screening length. Diblock copolymers yielding brush-type morphologies will be adsorbed at the solid/liquid and liquid/liquid interfaces and their surface coverages at these two interfaces will be compared and related to the mobility of the hydrophobic surface-anchoring block. Absorption of a polyelectrolyte into an oppositely- charged gel will be measured to determine the extent and kinetics of penetration of a charged macromolecule into a charged matrix under conditions of zero applied electric field. %%% Adsorption of polyelectrolytes is the critical step in the treatment of water for environmental purposes (drinking water, municipal and industrial effluents, etc.). This research will provide important experiments that can be correlated with various adsorption theories.

将研究聚电解质吸附到固/液和液/液界面的Schlenoff动力学和等温线。 将采用与表面连接的氧化还原基团衍生的金属表面来精确地控制表面电荷，以将聚合物构象和覆盖率与表面电荷密度联系起来。 这些“智能”氧化还原活性表面将用于确定吸附福尔斯是否在热力学或动力学控制下下降。 将合成放射性标记的亲水/疏水共聚物，如苯乙烯磺酸盐/丁基苯乙烯，并研究它们在两种不混溶液体之间的界面处的吸附。 对于吸附的聚电解质，平均线圈半径对盐浓度的依赖性将被测量，并与众所周知的依赖性的解决方案的尺寸屏蔽长度进行比较。 产生刷型形态的二嵌段共聚物将被吸附在固/液和液/液界面处，并且它们在这两个界面处的表面覆盖率将被比较并且与疏水表面锚定嵌段的流动性相关。 将测量带相反电荷的凝胶中的吸收，以确定在零施加电场的条件下带电荷的大分子渗透到带电荷的基质中的程度和动力学。 %聚电解质的吸附是用于环境目的的水处理（饮用水、市政和工业废水等）的关键步骤。 这项研究将提供重要的实验，可以与各种吸附理论。