Surface Composition of Fluorinated Poly(amide urethane) Block Copolymers by Electron Spectroscopy for Chemical Analysis

Abstract

The surface composition and near-surface depth profiles of annealed films of poly(amide urethane) block copolymers were measured using angle-dependent electron spectroscopy for chemical analysis (ESCA). Segregation of the fluorinated polyamide soft segment to the surface was detected and quantified. The poly(amide urethane)s were made from amine-terminated polyamides with N-alkylated fluorinated side chains as well as fluorinated backbones, methylenebis(cyclohexandiyl diisocyanate) (H12MDI), and butanediol.1 The resulting copolymers display extremely low surface energy. A deconvolution program was utilized to obtain composition−depth profiles and to confirm phase segregation.