Dispersion polymerization of methyl methacrylate using poly(HDFDMA-co-MMA) as a surfactant in supercritical carbon dioxide / Jungin Shin in Industrial & engineering chemistry research, Vol. 47 n°15 (Août 2008)  

Public ISBD [article]  inIndustrial & engineering chemistry research > Vol. 47 n°15 (Août 2008) . - p. 5680–5685 Titre : Dispersion polymerization of methyl methacrylate using poly(HDFDMA-co-MMA) as a surfactant in supercritical carbon dioxide Type de document : texte imprimé Auteurs : Jungin Shin, Auteur ; Kyung Shil Oh, Auteur ; Won Bae, Auteur ; Youn Woo Lee, Auteur Année de publication : 2008 Article en page(s) : p. 5680–5685 Note générale : Bibliogr. p. 5684-5685 Langues : Anglais (eng) Mots-clés : Methyl methacrylate  Dispersion polymerization Résumé : New surfactants, random copolymers of heptadecafluorodecyl methacrylate (HDFDMA) and methyl methacrylate (MMA), were synthesized at 343.2 K and 30 MPa in supercritical carbon dioxide (scCO2) with varying HDFDMA/MMA ratios. 1H NMR and FT-IR were used to confirm the structure and to determine the composition of the resulting copolymers. The phase behavior of poly(HDFDMA-co-MMA) in CO2 was obtained by means of a variable volume view cell, which will be used to select the polymerization condition. After that, dispersion polymerization of methyl methacrylate (MMA) in scCO2 was performed using 2,2′-azobis(isobutyronitrile) (AIBN) as the initiator and poly(HDFDMA-co-MMA) with various MMA mole fraction as a surfactant. The new surfactant, poly(HDFDMA-co-MMA), whose MMA content is lower than 12.3 wt %, shows comparable capacity to produce PMMA particles compared to poly(HDFDMA) surfactant. The resulting PMMA particles, such as those produced using poly(HDFDMA) homopolymer as a surfactant, could also be produced with poly(HDFDMA-co-MMA) up to 12.3 wt % MMA. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie070995v [article] Dispersion polymerization of methyl methacrylate using poly(HDFDMA-co-MMA) as a surfactant in supercritical carbon dioxide [texte imprimé] / Jungin Shin, Auteur ; Kyung Shil Oh, Auteur ; Won Bae, Auteur ; Youn Woo Lee, Auteur . - 2008 . - p. 5680–5685. Bibliogr. p. 5684-5685 Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 47 n°15 (Août 2008) . - p. 5680–5685 Mots-clés : Methyl methacrylate  Dispersion polymerization Résumé : New surfactants, random copolymers of heptadecafluorodecyl methacrylate (HDFDMA) and methyl methacrylate (MMA), were synthesized at 343.2 K and 30 MPa in supercritical carbon dioxide (scCO2) with varying HDFDMA/MMA ratios. 1H NMR and FT-IR were used to confirm the structure and to determine the composition of the resulting copolymers. The phase behavior of poly(HDFDMA-co-MMA) in CO2 was obtained by means of a variable volume view cell, which will be used to select the polymerization condition. After that, dispersion polymerization of methyl methacrylate (MMA) in scCO2 was performed using 2,2′-azobis(isobutyronitrile) (AIBN) as the initiator and poly(HDFDMA-co-MMA) with various MMA mole fraction as a surfactant. The new surfactant, poly(HDFDMA-co-MMA), whose MMA content is lower than 12.3 wt %, shows comparable capacity to produce PMMA particles compared to poly(HDFDMA) surfactant. The resulting PMMA particles, such as those produced using poly(HDFDMA) homopolymer as a surfactant, could also be produced with poly(HDFDMA-co-MMA) up to 12.3 wt % MMA. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie070995v

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Polymerization of n-vinylcarbazole in supercritical carbon dioxide and in a supercritical region of a carbon dioxide and dimethyl ether mixture / Kyung Shil Oh in Industrial & engineering chemistry research, Vol. 47 n°15 (Août 2008)  

Public ISBD [article]  inIndustrial & engineering chemistry research > Vol. 47 n°15 (Août 2008) . - p. 5734-5741 Titre : Polymerization of n-vinylcarbazole in supercritical carbon dioxide and in a supercritical region of a carbon dioxide and dimethyl ether mixture Type de document : texte imprimé Auteurs : Kyung Shil Oh, Auteur ; Won Bae, Auteur ; Youn Woo Lee, Auteur ; Hwayong Kim, Auteur Année de publication : 2008 Article en page(s) : p. 5734-5741 Note générale : Bibliogr. p. 5740-5741 Langues : Anglais (eng) Mots-clés : N-vinylcarbazole -- polimerization  Carbon dioxide  Fluorine-based Résumé : Spherical poly(N-vinylcarbazole) (PVK) particles were synthesized by polymerization of N-vinylcarbazole (NVCA) in supercritical carbon dioxide (scCO2) and a supercritical region of a CO2 and dimethyl ether (DME) mixture using a fluorine-based [poly(3,3,4,4,5,5,6,6,7,7,8,8,9,9,10,10,10-heptadecafluorodecyl methacrylate)] [poly(HDFDMA)] polymer as the surfactant and 2,2′-azobisisobutyronitrile (AIBN) as the initiator. The spherical PVK particles could be consistently produced under the given experimental conditions. The PVK particle size showed a bimodal distribution when scCO2 was used as solvent. Therefore DME was added to the system as a cosolvent. The resulting particle size was shown to be dependent on the amount of surfactant and DME added to the system. As the ratio of DME increased, the average molecular mass of the PVK particles decreased. The effects of surfactant and initiator concentrations were investigated with respect to the morphology, size, and molecular mass of the PVK particles. The effects of the addition of a mixed solvent consisting of CO2 + DME on polymeric particle morphology, size, and molecular mass of polymers were also studied and are discussed herein. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie071526w [article] Polymerization of n-vinylcarbazole in supercritical carbon dioxide and in a supercritical region of a carbon dioxide and dimethyl ether mixture [texte imprimé] / Kyung Shil Oh, Auteur ; Won Bae, Auteur ; Youn Woo Lee, Auteur ; Hwayong Kim, Auteur . - 2008 . - p. 5734-5741. Bibliogr. p. 5740-5741 Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 47 n°15 (Août 2008) . - p. 5734-5741 Mots-clés : N-vinylcarbazole -- polimerization  Carbon dioxide  Fluorine-based Résumé : Spherical poly(N-vinylcarbazole) (PVK) particles were synthesized by polymerization of N-vinylcarbazole (NVCA) in supercritical carbon dioxide (scCO2) and a supercritical region of a CO2 and dimethyl ether (DME) mixture using a fluorine-based [poly(3,3,4,4,5,5,6,6,7,7,8,8,9,9,10,10,10-heptadecafluorodecyl methacrylate)] [poly(HDFDMA)] polymer as the surfactant and 2,2′-azobisisobutyronitrile (AIBN) as the initiator. The spherical PVK particles could be consistently produced under the given experimental conditions. The PVK particle size showed a bimodal distribution when scCO2 was used as solvent. Therefore DME was added to the system as a cosolvent. The resulting particle size was shown to be dependent on the amount of surfactant and DME added to the system. As the ratio of DME increased, the average molecular mass of the PVK particles decreased. The effects of surfactant and initiator concentrations were investigated with respect to the morphology, size, and molecular mass of the PVK particles. The effects of the addition of a mixed solvent consisting of CO2 + DME on polymeric particle morphology, size, and molecular mass of polymers were also studied and are discussed herein. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie071526w

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