Le Brouster Rachel, Giboz Julien, Nourdine Ali, Tenchine Lionel, Martin Vincent, Mele Patrice
University Grenoble Alpes, University Savoie Mont Blanc, CNRS, Grenoble INP (Institute of Engineering and Management Univ. Grenoble Alpes), LEPMI, 38000 Grenoble, France.
CT-IPC, 2 Rue Pierre et Marie Curie, 01100 Bellignat, France.
Langmuir. 2024 Aug 14. doi: 10.1021/acs.langmuir.4c02290.
The aim of this work is to describe the segregation phenomenon of random perfluorinated copolymers toward the surface of a polystyrene (PS) matrix. Three random perfluorinated copolymers, named POISE-a (Polymer prOcessing Interface StabilizEr), synthesized with different amounts of chemically bound fluorine, were mixed with a commercial PS matrix by a solvent casting process. Their effect on the wettability properties of PS as a function of their concentration was measured first under static conditions with different liquids (water, formamide, diethylene glycol) and then under dynamic conditions with water. The evolution of the cosine of the static and dynamic advancing contact angles as a function of the fluorine content by weight in the bulk was predicted using an original physical law, in which the different parameters were related to the morphology of the additivated polymers as revealed by experimental X-ray photoelectron spectroscopy (XPS) and scanning electron microscopy-energy dispersive X-ray (SEM-EDX) measurements. This law has been successfully used to predict the wetting properties of other polymer blends and has contributed to a better understanding of the phase segregation mechanism of additives migrating to the PS surface, at the origin of the increase in hydrophobicity.
这项工作的目的是描述无规全氟共聚物向聚苯乙烯（PS）基体表面的偏析现象。通过溶液浇铸法将三种不同化学结合氟含量的无规全氟共聚物，即POISE-a（聚合物加工界面稳定剂）与商用PS基体混合。首先在静态条件下，使用不同液体（水、甲酰胺、二甘醇）测量它们在不同浓度下对PS润湿性的影响，然后在动态条件下用水进行测量。利用一条原始物理定律预测了静态和动态前进接触角的余弦随本体中氟重量含量的变化，其中不同参数与通过实验X射线光电子能谱（XPS）和扫描电子显微镜-能量色散X射线（SEM-EDX）测量所揭示的添加聚合物的形态有关。该定律已成功用于预测其他聚合物共混物的润湿性能，并有助于更好地理解添加剂迁移到PS表面的相分离机制，这是疏水性增加的根源。
