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Characterization of surface‐modified polyurethane blends, poly(vinyl alcohol), and poly(4‐hydroxybutyl acrylate) for biomedical application by electron spin resonance spectroscopy
Author(s) -
Lorenz Günter,
Klee Doris,
Höcker Hartwig,
Mittermayer Christian
Publication year - 1995
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.1995.070570401
Subject(s) - vinyl alcohol , polymer chemistry , polyurethane , electron paramagnetic resonance , acrylate , materials science , x ray photoelectron spectroscopy , methyl acrylate , molecule , spectroscopy , chemistry , polymer , organic chemistry , copolymer , chemical engineering , nuclear magnetic resonance , physics , engineering , quantum mechanics
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 τ c . © 1995 John Wiley & Sons, Inc.