SYNTHESIS, THERMAL BEHAVIOR, AND AGGREGATION IN AQUEOUS SOLUTION OF POLY(METHYL METHACRYLATE)-B-POLY(2-HYDROXYETHYL METHACRYLATE)

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dc.contributor.authorACEVEDO, B.
dc.contributor.authorMARTINEZ, F.
dc.contributor.authorOLEA, A. F.
dc.date.accessioned2016-07-07T13:51:33Z
dc.date.available2016-07-07T13:51:33Z
dc.date.issued2013-12
dc.descriptionIndexación: Web of Science; Scielo.es
dc.description.abstractAmphiphilic block copolymers of poly(methyl methacrylate) PMMA and poly(2-hidroxyethyl methacrylate) PHEMA were synthesized by a two-step atom transfer radical polymerization (ATRP). Copolymers with various degrees of polymerization and different relative block sizes were obtained. The structure of the resulting polymers have been characterized and verified by FT-IR and 1H-NMR, molecular weight were determined by size exclusion chromatography analyses. The thermal properties of these polymers were investigated by differential scanning calorimetry DSC and thermogravimetric analysis TGA. The glass transition temperature of mono halogenated PMMA increases from 116 °C to 123 °C with increasing molecular weight, whereas the glass transition temperature of block copolymers depends slightly on polymer structure. The derivatives of TGA curves indicate that thermal degradation occurs in one stage. The self-assembly of PMMA-b-PHEMA in aqueous solution have been investigated by fluorescence probing methods. The critical micelle concentrations are in the range 10-6 - 10-7 M. The micropolarity sensed by pyrene is higher than in aggregates formed by block copolymers based on polystyrene.es
dc.description.urihttp://ref.scielo.org/58vjrg
dc.identifier.citationJ. Chil. Chem. Soc. vol.58 no.4 Concepción Dec. 2013es
dc.identifier.issn0717-9707
dc.identifier.otherhttp://dx.doi.org/10.4067/S0717-97072013000400030
dc.identifier.urihttp://repositorio.unab.cl/xmlui/handle/ria/973
dc.language.isoenes
dc.publisherSociedad Chilena de Químicaes
dc.subjectBlock copolymerses
dc.subjectGlass transition temperaturees
dc.subjectThermogravimetric analysises
dc.subjectCritical micelle concentrationes
dc.subjectFluorescence probing methodses
dc.titleSYNTHESIS, THERMAL BEHAVIOR, AND AGGREGATION IN AQUEOUS SOLUTION OF POLY(METHYL METHACRYLATE)-B-POLY(2-HYDROXYETHYL METHACRYLATE)es
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