title: Amphiphilic copolymers of sucrose methacrylate and acrylic monomers: bio-based materials from renewable resource.
abstract: Regioselective sucrose 1'-O-methacrylate obtained by transesterification catalyzed by Proteinase-N was copolymerized with hydrophilic N-isopropylacrylamide and hydrophobic methyl methacrylate in different molar ratios by free radical polymerization. The copolymers were characterized by (13)C nuclear magnetic resonance spectroscopy, gel permeation chromatography, differential scanning calorimetry and thermogravimetry. Solubility and phase behavior of aqueous solutions were also investigated. The glass transition of the copolymers presents a positive deviation from the values of the homopolymers due to the high density of inter and intramolecular hydrogen bonding. Their solubility is strongly dependent on the composition. Copolymers poor in methyl methacrylate are water soluble, while copolymers richer in methyl methacrylate behaves as hydrogel. These hydrogels are not chemically crosslinked and their form can be design prior swelling by the conventional processing methods, such as solvent casting and extrusion for instance. Copolymers of N-isopropylacrylamide are water soluble and their aqueous solutions present a lower critical solution temperature behavior forming thermoreversible hydrogels.
authors.affiliation: Institute of Chemistry, University of Campinas, P.O. Box 6154, 13083-970 Campinas, SP, Brazil. heitorfno@gmail.com
authors.forename: Heitor F N
authors.initials: HF
authors.lastname: de Oliveira
authors.forename: Maria Isabel
authors.initials: MI
authors.lastname: Felisberti
mesh_terms: D000327:Adsorption; D002152:Calorimetry, Differential Scanning; D003247:Conservation of Natural Resources; D006860:Hydrogen Bonding; D057927:Hydrophobic and Hydrophilic Interactions; D008689:Methacrylates / Q000138:chemical synthesis / Q000737:chemistry*; D058105:Polymerization; D013395:Sucrose / Q000031:analogs & derivatives* / Q000138:chemical synthesis / Q000737:chemistry*; D013501:Surface-Active Agents; D013818:Thermogravimetry; D058989:Vitrification
chemical_list: D008689:Methacrylates; D013501:Surface-Active Agents; D013395:Sucrose