Literature DB >> 26097271

Ionization of covalent immobilized poly(4-vinylphenol) monolayers measured by ellipsometry, QCM and SPR.

Suji Uppalapati1, Na Kong2, Oscar Norberg2, Olof Ramström2, Mingdi Yan3.   

Abstract

Covalently immobilized poly(4-vinylphenol) (PVP) monolayer films were fabricated by spin coating PVP on perfluorophenyl azide (PFPA)-functionalized surface followed by UV irradiation. The pH-responsive behavior of these PVP ultrathin films was evaluated by ellipsometry, quartz crystal microbalance (QCM) and surface plasmon resonance (SPR). By monitoring the responses of these films to pH in situ, the ionization constant of the monolayer thin films was obtained. The apparent pKa value of these covalently immobilized PVP monolayers, 13.4 by SPR, was 3 units higher than that of the free polymer in aqueous solution.

Entities:  

Keywords:  Ionization constant; Monolayer; Perfluorophenyl azide; Poly(4-vinylphenol); pH response

Year:  2015        PMID： 26097271      PMCID： PMC4469237          DOI： 10.1016/j.apsusc.2015.03.014

Source DB:  PubMed          Journal:  Appl Surf Sci        ISSN： 0169-4332            Impact factor:   6.707


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