Impact of Star Polyacid Branching on Polymer Diffusion within Multilayer Films
Impact of Star Polyacid Branching on Polymer Diffusion within Multilayer Films
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DOI：
10.1021/acs.macromol.2c01104
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发表时间：
2022-09
期刊：
影响因子：
5.5
通讯作者：
Aliaksei Aliakseyeu;J. Ankner;S. Sukhishvili
中科院分区：
文献类型：
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作者：
Aliaksei Aliakseyeu;J. Ankner;S. Sukhishvili
合成了一系列线性和星形聚丙烯酸（L PAA和星形聚丙烯酸），探讨了分子结构对静电分层（LbL）薄膜的分层和聚合物动力学的影响。在酸性pH下，用聚[2-（二甲基氨基）甲基丙烯酸乙酯]（PDMAEMA）沉积L - PAA和星型PAA的LbL研究表明，随着聚合物分支的增加，膜干厚度增加~ 30%。与沉积在薄膜内的星形聚合物质量更大一致，原位椭偏测量表明，与线性PAA相比，8臂PAA的扩散系数高3.5倍。为了进行比较，通过中子反射法（NR）研究了含有氢化和氘化多阳离子（h PDMAEMA和d PDMAEMA）的堆叠多层，探索了线性PDMAEMA伙伴的动力学。由低离子- for沉积的多层堆叠层
A series of linear and star poly(acrylic acids) ( L PAA and star PAAs) were synthesized to explore the effect of molecular architecture on the stratification and polymer dynamics of electrostatic layer-by-layer (LbL) films. Studies of LbL deposition of L PAA and star PAAs with poly[2-(dimethyl amino)ethyl methacrylate] (PDMAEMA) at acidic pH revealed an ~30 % increase in film dry thickness with increased polymer branching. Consistent with a greater mass of star polymer deposited within the films, in situ ellipsometric measurements of PAA uptake from solution revealed ~ 3.5-fold greater diffusion coefficients for 8-arm PAA in comparison to linear PAA. For comparison, the dynamics of the linear PDMAEMA partner was explored via neutron reflectometry (NR) studies of stacked multilayers containing hydrogenated and deuterated polycations, h PDMAEMA and d PDMAEMA. The stacked multilayers deposited from low-ionic-For