School of Material Science and Engineering, Inner Mongolia University, Hohhot 010020, P. R. China.
Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing 100190, P. R. China.
Soft Matter. 2023 Jun 21;19(24):4449-4457. doi: 10.1039/d3sm00525a.
In this paper, the adsorption behaviour and wetting modification ability of the sodium salts of bis-octadecenoyl succinate (GeminiC3, GeminiC6) and monomers on polymethyl methacrylate (PMMA) surfaces were investigated. The difference in spacer length led to slightly different behaviour of surfactant molecules in solution. The large molecular structure and short flexible spacer of GeminiC3 led to a complex self-aggregation behaviour in solution, forming micelles at low concentrations, leading to a rapid decrease in surface tension and subsequent transition to monolayer or multilayer vesicles. In GeminiC6, the longer flexible spacer groups act as spatial structure modifiers that hinder the formation of vesicles. The adsorption behaviour of the gas-liquid interface was analysed in three stages for the peculiar inflection points where surface tension appears. Combining contact angle measurements, adhesion tension and interfacial tension data showed that GeminiC3 and C6 formed a saturated monolayer on the adsorbed PMMA surface at low concentrations and a bilayer structure at high concentrations. Due to the low resistance of molecular space sites, the monomers adsorbed heavily on the PMMA surface, forming semi-colloidal aggregates with the lowest contact angle of monomeric surfactant solutions reaching 38° on the PMMA surface. Also, the monomer and GeminiC3 and C6 surfactants in this paper have a very high hydrophilic modification ability on the PMMA surface compared to other literature.
本文研究了双十八烯酰琥珀酸酯钠盐（GeminiC3、GeminiC6）和单体在聚甲基丙烯酸甲酯（PMMA）表面的吸附行为和润湿改性能力。间隔基长度的差异导致表面活性剂分子在溶液中的行为略有不同。GeminiC3 的大分子量结构和短柔性间隔基导致其在溶液中形成复杂的自聚集行为，在低浓度下形成胶束，导致表面张力迅速下降，随后转变为单层或多层囊泡。在 GeminiC6 中，较长的柔性间隔基作为空间结构调节剂，阻碍了囊泡的形成。在表面张力出现特殊拐点的三个阶段分析了气-液界面的吸附行为。结合接触角测量、附着力张力和界面张力数据表明，GeminiC3 和 C6 在低浓度下在吸附的 PMMA 表面上形成饱和单层，在高浓度下形成双层结构。由于分子空间位阻低，单体在 PMMA 表面上吸附严重，形成半胶态聚集体，单体表面活性剂溶液的最低接触角达到 38°。此外，与其他文献相比，本文中的单体和 GeminiC3、C6 表面活性剂对 PMMA 表面具有非常高的亲水改性能力。
