Two polyurethane blends—poly(carbonate urethane)/poly(vinyl alcohol) [PCU/PVA] and the aliphatic poly(ether urethane) (Tecoflex™)/poly(pentanedioic acid mono‐4‐(acryloyloxy)butyl ester) [Tecoflex™/COOH]—were surface‐modified. Poly(vinyl alcohol) [PVA] and poly(4‐hydroxybutyl acrylate) [PHBA] were used as model surfaces. 4‐Isocyanato butanoic acid methyl ester was coupled as a spacer molecule to PVA and the PVA‐containing polyurethane blend. Saponification of the generated ester group was verified by means of Electron Spin Resonance (ESR) spectroscopy using the nitroxyl radical 4‐amino‐2,2,6,6‐tetramethylpiperidine‐1‐oxyl (4‐amino‐TEMPO) as a reporter group. In the case of Tecoflex™ and PHBA, glutaric anhydride served as a spacer molecule. 4‐Amino‐TEMPO was coupled to this spacer as well. ESR spectroscopy as a bulk method was used together with the surface‐sensitive method X‐Ray Photoelectron Spectroscopy (XPS) verifying the modification steps by elemental composition, ESR line shapes, and determination of the rotational correlation time τc.
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Lorenz et al. (1995) studied this question.
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