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Micro and nano cellular amorphous polymers (PMMA, PS) in supercritical CO2 assisted by nanostructured CO2-philic block copolymers - One step foaming process

dc.rights.licenseopen
hal.structure.identifierLaboratoire de Chimie des Polymères Organiques [LCPO]
dc.contributor.authorREGLERO RUIZ, José Antonio
hal.structure.identifierIUT, Dept Sci & Genie Mat [Univ Bordeaux]
dc.contributor.authorPEDROS, Mathieu
hal.structure.identifierIUT, Dept Sci & Genie Mat [Univ Bordeaux]
dc.contributor.authorTALLON, Jean-Marc
hal.structure.identifierIUT, Dept Sci & Genie Mat [Univ Bordeaux]
hal.structure.identifierLaboratoire de Chimie des Polymères Organiques [LCPO]
hal.structure.identifierTeam 1 LCPO : Polymerization Catalyses & Engineering
dc.contributor.authorDUMON, Michel
dc.date.accessioned2020
dc.date.available2020
dc.date.issued2011
dc.identifier.issn0896-8446
dc.identifier.urihttps://oskar-bordeaux.fr/handle/20.500.12278/20342
dc.description.abstractEnMicrocellular foaming of commodity amorphous polymers, poly(methyl methacrylate) (PMMA), and poly(styrene) (PS) was studied in supercritical CO2 via a batch one-step process in the presence of block copolymers able to change their foaming behaviour and therefore the porous structures. Triblock (styrene-co-butadiene-co-methylmethacrylate SBM, methylmethacrylate-co-butylacrylate-co-methylmethacrylate MAM) terpolymers were blended to PS or PMMA by extrusion. They showed advantages compared to classical PS-PMMA polymer blends in terms of cell size control and reduction of cell size. Foaming is carried out on bulk injection molded samples which were saturated under high. pressures of CO2 (300 bars) at different temperatures (25 degrees C to 80 degrees C) and different depressurization rates (pressure drop rates from 150 bar/min to 12 bar/min). Very distinct cellular structures and densities were controlled by varying either the copolymer type or the foaming conditions (T,P). Cell sizes ranged from 0.2 mu m to 200 mu m, and densities from 0.30 g/cm(3) to 1 g/cm(3) in the polymers considered. Particularly, when triblock copolymers were able to self organize (nanostructuring) in a polymer matrix, they became phase separated at a nanometer level, presenting nanostructured polymers matrixes. To conclude the study, a possible nanostructuring mechanism is suggested based on the interplay between rubbery and highly CO2-philic blocks/rigid and less CO2-philic blocks. It is demonstrated that block copolymer additives are a good pathway towards micro and ultra microcellular supercritical CO2 foaming of amorphous polymers.
dc.language.isoen
dc.publisherElsevier
dc.title.enMicro and nano cellular amorphous polymers (PMMA, PS) in supercritical CO2 assisted by nanostructured CO2-philic block copolymers - One step foaming process
dc.typeArticle de revue
dc.identifier.doi10.1016/j.supflu.2011.04.022
dc.subject.halChimie/Polymères
bordeaux.journalJournal of Supercritical Fluids
bordeaux.page168-176
bordeaux.volume58
bordeaux.hal.laboratoriesLaboratoire de Chimie des Polymères Organiques (LCPO) - UMR 5629*
bordeaux.issue1
bordeaux.institutionBordeaux INP
bordeaux.institutionUniversité de Bordeaux
bordeaux.peerReviewedoui
hal.identifierhal-00956649
hal.version1
hal.origin.linkhttps://hal.archives-ouvertes.fr//hal-00956649v1
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