Journal
CHEMISTRY-A EUROPEAN JOURNAL
Volume 17, Issue 52, Pages 14867-14877Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/chem.201101334
Keywords
HRMAS; hydrogels; networks; NMR spectroscopy; polymers
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Funding
- HRMAS NMR facility of the VUB [GOA31]
- Bulgarian Academy of Sciences (BAS)
- Fund for Scientific Research Flanders (Belgium)
- FWO [VS.016.10N]
- National Science Fund of Bulgaria [RNF 02/13]
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1H HRMAS NMR spectroscopy is applied to gain insight into the chemical and morphological structure of double-network (DN) hydrogels, prepared from poly(2-acrylamido-2-methyl-1-propanesulfonic acid) (PAMPS) and poly(acrylamide) (PAAm). The method enables one to obtain detailed information at the molecular level about the formation of covalent bonds between the two polymer networks through non-reacted double bonds of the cross-linker N,N'-methylene bis(acrylamide) (MBAA). Evidence to the existence of strong hydrogen-bond interactions based on the N?H group of the PAMPS as a hydrogen-bond donor and the C?O group of the PAAm as a hydrogen-bond acceptor is also provided. These findings clarify the origin of the toughening mechanism and the exceptionally strong mechanical properties of DN gels, further supported by microhardness data.
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