One‐Step Preparation of Electrospun Microfibrous Polystyrene Mats Having Surface Enriched in p‐tert‐Butylcalix[4]arene Fitted with Phosphinoyl Pendant Arms
Polystyrene microfibers containing lower‐rim substituted calix4]arene with phosphinoyl pendant arms were easily prepared in one‐step procedure by electrospinning. A specific feature of the fibers is the difference in their functionality at the surface and in the bulk. The graded structure of the fibers was shown by XPS analyses. The calix4]arene concentration in the 3–5 nm surface layer was 50% higher than the theoretically calculated if calix4]arene was uniformly distributed in the fibers. A six‐coordinated complex was formed between the calix4]arene included in the fibers and Ni2+ ions. The distribution of phosphorus along the fibers is uniform, as evidenced by X‐ray mapping.
