聚电解质PSS/PDDA分子沉积膜动力学  

On the Kinetics of Molecular Deposition of Poly(styrenesulfonate)/Poly(diallyldimethylammonium choloride) Films

作　　者：高芒来[1] 陈刚[1] 

机构地区：[1]石油大学(北京)化工学院,北京102249

出　　处：《应用化学》2003年第10期972-976,共5页Chinese Journal of Applied Chemistry

基　　金：重质油加工国家重点实验室开放课题 (2 0 0 2 0 5 )

摘　　要：利用平面接触角测量仪和紫外 可见吸收光谱法监测了聚苯乙烯磺酸钠 (PSS) /聚二烯丙基二甲基胺盐酸盐 (PDDA)分子沉积 (MD)膜成膜过程。通过动力学研究 ,揭示了不同聚电解质分子具有不同平衡吸附时间的微观机理。结果表明 ,PSS/PDDA是以单分子层层状沉积 ;2种分子的成膜过程包括扩散控制的Langmuir快速吸附和相对缓慢的表面重组 2个阶段 ;第 6层PSS和第 7层PDDAMD膜润湿性稳定的时间分别为 35和 2 5min ;PSS和PDDA的吸附速率常数分别为 0 6 0 4和 1 2 31mL/ (g·s)。The kinetics of molecular deposition(MD) of poly (styrenesulfonate)(PSS)/poly(diallyldimethylammonium choloride)(PDDA) films was examined. The kinetics results of molecular adsorption reveal the micromechanism of polyelectrolyte MD film. The linear relationship between UV-Vis absorbance of PSS/PDDA and the number of MD film layers confirms alternative deposition of PSS and PDDA layers as that carried out in deposition process. The great variation of contact angle and UV-Vis absorbance with depositing time indicates that the film formation process of the two polymeric molecules comprises two stages: diffusion controlled rapid langmuir adsorption and relative slow rearrangement of molecules on the surface. For the 6 th PSS and 7 th PDDA film, the time of adsorption equilibrium is 35 min and 25 min respectively. The adsorption rate constants for PSS and PDDA are found to be 0.604 mL/(g·s) and 1.231 mL/(g·s), respectively.

关 键 词：聚苯乙烯磺酸钠 聚二烯丙基二甲基胺盐酸盐 分子沉积膜 动力学 

分 类 号：O631[理学—高分子化学]