Polymer-Clay Nanocomposites through Multiple Hydrogen-bonding Interactions
Polymer/Clay Nanocomposites through Multiple Hydrogen-bonding Interactions, M. Aydin, M. A. Tasdelen, T. Uyar, Y. Yagci, J. Polym. Sci. Polym. Chem. Ed., 51, 23-28 (2015) DOI: 10.1002/pola.27487
An 2-ureido-4[1H]pyrimidinone (UPy) motif with self-association capability (through quadruple hydrogen bonds) is successfully anchored onto montmorillonite clay layers. Polymer/clay nanocomposites are prepared by specific hydrogen bonding interactions between surface functionalized silica nanoclays and UPy-bonded supramolecular poly(ethylene glycol) or poly(ɛ-caprolactone). The mixed morphologies including intercalated layers with a non-uniform separation and exfoliated single layers isolated from any stack are determined by combined XRD and TEM measurements. Thermal analyses show that all nanocomposites have higher decomposition temperatures and thermal stabilities compared to neat polymer. The DSC data imply that the crystallinity of polymers do not show essential changes upon introduction of organomodified UPy clays.