Dataset for: Competitive Adsorption Between PEO-Containing Block Copolymers and Homopolymers at Silica

Dataset supporting the publication "Competitive Adsorption Between PEO-Containing Block Copolymers and Homopolymers at Silica" that appears in Journal of Dispersion Science and Technology 2014, http://dx.doi.org/10.1080/01932691.2014.880847. The ability to manipulate polymer adsorption is useful for applications involving colloidal stabilization, e.g., paints, cosmetics, lubricants, and mineral and waste-water treatment. We have an on-going interest on the use of organic molecules for modulating the aqueous solution and adsorption properties of poly(ethylene oxide)-poly(propylene oxide)-poly(ethylene oxide) (PEO-PPO-PEO) block copolymers. In the present study, the influence of low molecular weight PEO homopolymer on the adsorption of a representative PEO-PPO-PEO block copolymer (Pluronic P105: EO37-PO56-EO37) at the surface of protonated silica nanoparticles dispersed in water is investigated. Pluronic P105 forms hydrophobic domains on the surface of protonated silica at a critical surface micelle concentration, csmc, of 0.02 wt% in the presence 0.1 wt% silica nanoparticles in water, well below the cmc of Pluronic P105 in water (0.6 wt%). Dye solubilization experiments reveal an increase in the PEO-PPO-PEO block copolymer critical surface micelle concentration with increasing amounts of added PEO homopolymer. The resulting critical displacer concentration, cdc, for PEO homopolymer of molecular weights 200 and 600 Da was measured to be 0.1 wt% and 0.07 wt%, respectively, in the presence of 0.1 wt% silica nanoparticles. Capillary viscometry measurements indicate a decrease in the adsorbed layer thickness at the protonated silica surface with increasing PEO homopolymer concentration. The data presented herein are consistent with a physical model which considers “patches” of PEO-PPO-PEO block copolymer and PEO homopolymer adsorbed at the silica surface.本数据集支持发表于《分散科学与技术期刊（Journal of Dispersion Science and Technology）》2014年的论文《含PEO嵌段共聚物与均聚物在二氧化硅表面的竞争性吸附》，其DOI链接为http://dx.doi.org/10.1080/01932691.2014.880847。 调控聚合物吸附的能力在诸多胶体稳定相关应用中具有重要实用价值，例如涂料、化妆品、润滑剂以及矿物处理与废水处理领域。 我们长期致力于利用有机分子调控聚环氧乙烷-聚环氧丙烷-聚环氧乙烷（poly(ethylene oxide)-poly(propylene oxide)-poly(ethylene oxide)，缩写PEO-PPO-PEO）嵌段共聚物的水溶液性质与吸附行为。 本研究探讨了低分子量聚环氧乙烷（poly(ethylene oxide)，缩写PEO）均聚物对典型PEO-PPO-PEO嵌段共聚物（Pluronic P105：EO37-PO56-EO37）在水分散质子化二氧化硅纳米颗粒表面吸附行为的影响。 当水相中二氧化硅纳米颗粒浓度为0.1 wt%时，Pluronic P105在质子化二氧化硅表面形成疏水结构的临界表面胶束浓度（critical surface micelle concentration，缩写csmc）为0.02 wt%，远低于该共聚物在纯水中的临界胶束浓度（critical micelle concentration，缩写cmc，0.6 wt%）。 染料增溶实验结果表明，随着添加的PEO均聚物含量增加，PEO-PPO-PEO嵌段共聚物的临界表面胶束浓度随之升高。 在0.1 wt%二氧化硅纳米颗粒存在的条件下，我们测得分子量分别为200 Da和600 Da的PEO均聚物的临界置换剂浓度（critical displacer concentration，缩写cdc）依次为0.1 wt%与0.07 wt%。 毛细管粘度法测量结果显示，随着PEO均聚物浓度升高，质子化二氧化硅表面的吸附层厚度有所降低。 本文呈现的实验数据与下述物理模型相符：该模型认为二氧化硅表面吸附有PEO-PPO-PEO嵌段共聚物与PEO均聚物的“斑块”结构。