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Acid‐Containing Tyrosine‐Derived Polycarbonates: Wettability and Surface Reactivity
Author(s) -
Hoven Vipavee P.,
Poopattanapong Adisorn,
Kohn Joachim
Publication year - 2004
Publication title -
macromolecular symposia
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.257
H-Index - 76
eISSN - 1521-3900
pISSN - 1022-1360
DOI - 10.1002/masy.200451210
Subject(s) - contact angle , x ray photoelectron spectroscopy , carboxylic acid , carboxylate , wetting , polymer , polymer chemistry , reactivity (psychology) , chemistry , organic chemistry , materials science , chemical engineering , medicine , alternative medicine , pathology , engineering , composite material
Tyrosine‐derived polycarbonates having carboxylic acid pendant groups were characterized by water contact angle and X‐ray photoelectron spectroscopy (XPS). A pronounce decrease of receding angle as well as contact angle hysteresis as a function of acid composition strongly indicated that the acid groups are more accessible at the water/polymer interface after hydration. pH dependent contact angle confirmed an existence of carboxylic acid groups in the surface region. The receding angle transition appearing in the pH range of 4‐6 was a consequence of hydrophilicity change due to interconverting from carboxylic acid (‐COOH) to carboxylate ion (‐COO − ). The surface compositions of imidazole‐labeled polymers as analyzed by XPS were consistent with the bulk stoichiometry of the polymers. Reactivity of acid groups towards chemical reaction at the surface was also investigated. The acid groups at the surface of polymers were capable of adsorbing a significant amount of calcium ion from simulated body fluid and being activated by a reaction with N ‐hydroxysuccinimide.