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pH-Responsive Aminomethyl Functionalized Poly(p-xylylene) Coatings by Chemical Vapor Deposition Polymerization

Koenig, Meike; Kumar, Ramya; Hussal, Christoph; Trouillet, Vanessa; Barner, Leonie; Lahann, Joerg

Abstract:
The preparation of stimuli-responsive aminomethyl functionalized poly(p-xylylene) coatings by chemical vapor deposition polymerization is reported. Modification of the paracyclophane precursor with ionizable aminomethyl groups leads to polymer coatings with pH-responsive swelling properties. The swelling behavior is monitored in situ using spectroscopic ellipsometry and additional streaming potential measurements are performed. With decreasing pH-value, the coating becomes increasingly charged and reversibly swells to several times its dry thickness. The swelling ratio is sensitive to the ionic strength of the solution. By using a mixture of unfunctionalized and functionalized precursors in the chemical vapor deposition process, the number of charges in the polymer layer can be tuned and with it the swelling ratio of the coating. As a proof-of-concept for possible applications, a commercial paper filter is coated. This results in a pH-dependent wetting behavior and pH-dependent transport through the capillaries of the paper.


Zugehörige Institution(en) am KIT Institut für Biologische Grenzflächen (IBG)
Institut für Angewandte Materialien - Energiespeichersysteme (IAM-ESS)
Institut für Funktionelle Grenzflächen (IFG)
Karlsruhe Nano Micro Facility (KNMF)
Publikationstyp Zeitschriftenaufsatz
Jahr 2017
Sprache Englisch
Identifikator ISSN: 0025-116X, 1022-1352, 1521-3935
KITopen ID: 1000066968
HGF-Programm 47.02.06; LK 01
Erschienen in Macromolecular chemistry and physics
Band 218
Heft 9
Seiten Art. Nr. 1600521
Schlagworte chemical vapor deposition polymerization; hydrogel coatings; poly-(p-xylylene); responsive coatings
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