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    Interfacial Structure of a DOPA-Inspired Adhesive Polymer Studied by Sum Frequency Generation Vibrational Spectroscopy

    Year: 2013

    Journal: Langmuir, 29, pp 6659-6664, 20130926

    Authors: Chuan Leng, Yuwei Liu, Courtney Jenkins, Heather Meredith, Jonathan J. Wilker, Zhan Chen

    Organizations: Department of Chemistry, University of Michigan, Ann Arbor, Michigan 48109, United States, Department of Chemistry and School of Materials Engineering, Purdue University, West Lafayette, Indiana 47907, United States

    Marine mussels deposit adhesive proteins containing 3,4-dihydroxyphenylalanine (DOPA) to attach themselves to different surfaces.Isolating such proteins from biological sources for adhesion purposes tends tobe challenging. Recently, a simplified synthetic adhesive polymer, poly[(3,4-dihydroxystyrene)-co-styrene] (PDHSS), was developed to mimic DOPAcontainingproteins. The pendant catechol group in this polymer providescross-linking and adhesion much like mussel proteins do. In this work, sumfrequency generation (SFG) vibrational spectroscopy was applied to reveal thestructures of this DOPA-inspired polymer at air, water, and polymer interfaces.SFG spectroscopy results showed that when underwater, the catechol ringsand the quinone rings were ordered, ready to adhere to surfaces. At the hydrophobic polystyrene interface, benzene π−π stackingis likely the adhesive force, whereas at the hydrophilic poly(allylamine) interface, primary amines may form hydrogen bonds withcatechol or react with quinones for adhesion.