Abstract
ABSTRACTWe investigated the interfacial properties of poly(vinyl alcohol) carrying UV‐crosslinkable pendant quaternized stilbazole (styrylpyridinium), PVA‐SbQ. The extent and dynamics of PVA‐SbQ cyclodimerization reactions and crosslinking induced by UV irradiation were monitored in situ and in real time by quartz crystal microgravimetry (QCM). Sensograms reflecting time‐dependent changes in density and viscoelasticity of crosslinking films followed a Boltzmann sigmoidal model, depending on precursor film composition and irradiation power. The shifts in QCM frequency and energy dissipation upon PVA‐SbQ cyclodimerization correlated with three photo‐crosslinking phases involving soft‐to‐rigid transitions, namely, induction (initiation), main crosslinking (interaction), and termination. PVA‐SbQ films crosslinked to different degree were used as protein carriers and a slower release profile was determined for the films that underwent more extensive crosslinking. Overall, this study demonstrates for the first time the dynamics of PVA‐SbQ crosslinking and its impact in system viscoelasticity and protein release. © 2014 Wiley Periodicals, Inc. J. Polym. Sci., Part B: Polym. Phys. 2015, 53, 345–355
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