Thixotropic supramolecular pectin-poly(ethylene glycol) methacrylate (PEGMA) hydrogels
Chan, S.Y Choo, W.S Young, D.J Loh, X.J
Chan, S.Y
Choo, W.S
Young, D.J
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Abstract
Pectin is an anionic, water-soluble polymer predominantly consisting of covalently 1,4-linked ?-D-galacturonic acid units. This naturally occurring, renewable and biodegradable polymer is underutilized in polymer science due to its insolubility in organic solvents, which renders conventional polymerization methods impractical. To circumvent this problem, cerium-initiated radical polymerization was utilized to graft methoxy-poly(ethylene glycol) methacrylate (mPEGMA) onto pectin in water. The copolymers were characterized by 1H nuclear magnetic resonance (NMR), Fourier transform infrared (FTIR) spectroscopy and thermogravimetric analysis (TGA), and used in the formation of supramolecular hydrogels through the addition of ?-cyclodextrin (?-CD) to induce crosslinking. These hydrogels possessed thixotropic properties; shear-thinning to liquid upon agitation but settling into gels at rest. In contrast to most of the other hydrogels produced through the use of poly(ethylene glycol) (PEG)-grafted polymers, the pectin-PEGMA/?-CD hydrogels were unaffected by temperature changes. © 2016 by the authors.
Keywords
Biodegradable polymers, Cerium, Crosslinking, Cyclodextrins, Ethylene glycol, Fourier transform infrared spectroscopy, Grafting (chemical), Nuclear magnetic resonance, Nuclear magnetic resonance spectroscopy, Polyethylene glycols, Polyethylene oxides, Polymerization, Polyols, Shear thinning, Supramolecular chemistry, Thermogravimetric analysis, Methoxypolyethylene glycol, Nuclear magnetic resonance(NMR), Pectin, Poly(ethylene glycol) methacrylate, Polymerization method, Supramolecular hydrogels, Thixotropic properties, Watersoluble polymers, Hydrogels
Source Title
Polymers
Publisher
Series/Report No.
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Rights
Attribution 4.0 International
Date
2016
DOI
10.3390/polym8110404
Type
Article