Graphene-induced crystallinity of bisphenol A polycarbonate in the presence of supercritical carbon dioxide

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dc.contributor	Universitat Politècnica de Catalunya. Departament de Ciència dels Materials i Enginyeria Metal·lúrgica
dc.contributor	Universitat Politècnica de Catalunya. POLYCOM - Polimers i compòsits: tecnologia
dc.contributor.author	Gedler, Gabriel
dc.contributor.author	Antunes, Marcelo de Sousa Pais
dc.contributor.author	Velasco Perero, José Ignacio
dc.date	2013-11-01
dc.identifier.citation	Gedler, G.; De Sousa Pais, M.; Velasco J.I. Graphene-induced crystallinity of bisphenol A polycarbonate in the presence of supercritical carbon dioxide. "Polymer", 01 Novembre 2013, vol. 54, núm. 23, p. 6389-6398.
dc.identifier.citation	0032-3861
dc.identifier.citation	10.1016/j.polymer.2013.09.050
dc.identifier.uri	http://hdl.handle.net/2117/20916
dc.language.iso	eng
dc.publisher	Elsevier
dc.relation	http://www.sciencedirect.com/science/article/pii/S0032386113009166
dc.rights	info:eu-repo/semantics/openAccess
dc.subject	Àrees temàtiques de la UPC::Enginyeria dels materials::Materials plàstics i polímers
dc.subject	Polycarbonates
dc.subject	Crystallinity
dc.subject	Polycarbonate
dc.subject	Graphene
dc.subject	Policarbonats -- Proves
dc.title	Graphene-induced crystallinity of bisphenol A polycarbonate in the presence of supercritical carbon dioxide
dc.type	info:eu-repo/semantics/publishedVersion
dc.type	info:eu-repo/semantics/article
dc.description.abstract	Changes in the crystallinity of polycarbonate (PC) induced by the simultaneous presence of 0.5 wt% graphene nanoplatelets (GnP) and supercritical carbon dioxide (sc-CO2) were examined by means of Raman spectroscopy, WAXS, SAXS and DSC. Composites were prepared by melt-mixing, compression-molding and dissolving sc-CO2 at high pressure and temperature. It was found that dissolved CO2 induced the formation of an ordered non-crystalline phase in PC during slow cooling under pressure. A fast depressurization and cooling did not cause such an effect in the resultant foams. GnP induced a higher crystallinity in PC, especially when combined with sc-CO2, even during fast depressurization and cooling. Raman spectroscopy enabled to correlate changes in the PC vibration modes with the presence of ordered phases, as well as to detect interactions between GnP and PC. Additionally, evidence of GnP exfoliation in the composites could be explained by the intensity reduction of the (002) graphite diffraction peak.
dc.description.abstract	Peer Reviewed

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