Hydrogen-bonded multilayers with controllable pH-induced disintegration kinetics for controlled release applications from surfaces

E Bag, O Begik, P Yusan… - Journal of Macromolecular …, 2015 - Taylor & Francis
E Bag, O Begik, P Yusan, I Erel-Goktepe
Journal of Macromolecular Science, Part A, 2015Taylor & Francis
We report on incorporation of coordination complexes into hydrogen-bonded multilayers
which was found to be an effective method to control pH-induced disintegration kinetics of
hydrogen-bonded multilayers. By taking advantage of the strong metal chelating and
hydrogen donating properties of Tannic Acid (TA), coordination complexes of Zr4+ and TA
(Zr (IV)-TA complexes) were prepared and then self-assembled at the surface using
hydrogen accepting polymers such as poly (N-vinyl caprolactam)(PVCL) or poly (N …
We report on incorporation of coordination complexes into hydrogen-bonded multilayers which was found to be an effective method to control pH-induced disintegration kinetics of hydrogen-bonded multilayers. By taking advantage of the strong metal chelating and hydrogen donating properties of Tannic Acid (TA), coordination complexes of Zr4+ and TA (Zr(IV)-TA complexes) were prepared and then self-assembled at the surface using hydrogen accepting polymers such as poly (N-vinyl caprolactam) (PVCL) or poly(N-isopropyl acrylamide) (PNIPAM). Incorporation of Zr(IV)-TA complexes into hydrogen-bonded multilayers allowed controlling kinetics of pH-induced disintegration of the films. We found that the onset of pH-triggered disintegration of the multilayers could be delayed for ∼10 h at a physiologically related pH, which may be an important feature for controlled delivery applications from surfaces. In contrast to neutral polymer/TA multilayers which dissolve rapidly above their critical pH, multilayers of Zr(IV)-TA complexes dissolved in a linear fashion in a longer period of time than that of multilayers composed solely from hydrogen bonding polymers. Multilayers of Zr(IV)-TA complexes could uptake methylene blue at a moderately acidic pH and release the dye molecules at strongly acidic conditions. This study contributes to fundamental understanding of structure-property relationship in hydrogen-bonded LbL films. Considering the interesting biological properties of TA, multilayers of Zr(IV)-TA complexes may be promising for future biomedical applications.
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