Documents disponibles écrits par cet auteur

Effects of nonsolvent molecular structure and its content on the formation of the macroporous polyarylate layer coated onto the polyethylene separator / Sang Chul Roh in Industrial & engineering chemistry research, Vol. 50 N° 22 (Novembre 2011) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 50 N° 22 (Novembre 2011) . - pp. 12596–12605 Titre : Effects of nonsolvent molecular structure and its content on the formation of the macroporous polyarylate layer coated onto the polyethylene separator Type de document : texte imprimé Auteurs : Sang Chul Roh, Auteur ; Kwon Won Song, Auteur ; C. K. Kim, Auteur Année de publication : 2012 Article en page(s) : pp. 12596–12605 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Macroporous  Polyethylene Résumé : A macroporous polyarylate (PAR) layer was formed on a polyethylene (PE) separator from coating solutions containing PAR, tetrahydrofuran (THF) as the solvent, and various alcohols (or diols) as nonsolvents via a nonsolvent-induced phase separation (NIPS) process. The effects of the nonsolvent molecular structure and its content on the morphology of the coating layer were explored. Droplets grew by a coarsening process after the onset of phase separation by solvent evaporation, and then leveled off at a fixed droplet size. The final pore size increased with the molecular weight of the alcohol (or diol) when the composition of the coating solution was fixed. It increased as the nonsolvent content in the coating solution increased, while it decreased as the PAR content in the coating solution increased. The meltdown temperature of the separator increased with the macroporous PAR coating, while air permeability of the separator was reduced with the coating. Changes in the meltdown temperature and air permeability depended on the morphology of the coating layer. DEWEY : 660 ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie201716m [article] Effects of nonsolvent molecular structure and its content on the formation of the macroporous polyarylate layer coated onto the polyethylene separator [texte imprimé] / Sang Chul Roh, Auteur ; Kwon Won Song, Auteur ; C. K. Kim, Auteur . - 2012 . - pp. 12596–12605. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 50 N° 22 (Novembre 2011) . - pp. 12596–12605 Mots-clés : Macroporous  Polyethylene Résumé : A macroporous polyarylate (PAR) layer was formed on a polyethylene (PE) separator from coating solutions containing PAR, tetrahydrofuran (THF) as the solvent, and various alcohols (or diols) as nonsolvents via a nonsolvent-induced phase separation (NIPS) process. The effects of the nonsolvent molecular structure and its content on the morphology of the coating layer were explored. Droplets grew by a coarsening process after the onset of phase separation by solvent evaporation, and then leveled off at a fixed droplet size. The final pore size increased with the molecular weight of the alcohol (or diol) when the composition of the coating solution was fixed. It increased as the nonsolvent content in the coating solution increased, while it decreased as the PAR content in the coating solution increased. The meltdown temperature of the separator increased with the macroporous PAR coating, while air permeability of the separator was reduced with the coating. Changes in the meltdown temperature and air permeability depended on the morphology of the coating layer. DEWEY : 660 ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie201716m

Fabrication of novel polyurethane elastomer composites containing hollow glass microspheres and their underwater applications / Hyungu Im in Industrial & engineering chemistry research, Vol. 50 N° 12 (Juin 2011) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 50 N° 12 (Juin 2011) . - pp. 7305-7312 Titre : Fabrication of novel polyurethane elastomer composites containing hollow glass microspheres and their underwater applications Type de document : texte imprimé Auteurs : Hyungu Im, Auteur ; Sang Chul Roh, Auteur ; Chang Keun Kim, Auteur Année de publication : 2011 Article en page(s) : pp. 7305-7312 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Microsphere  Hollow  glass  Composite  material Résumé : Thermoplastic polyurethane (TPU) elastomers are frequently used in underwater applications. Desirable polymeric materials have lower densities and lower swelling ratios for seawater and paraffin oil, along with better mechanical strength than TPU after impregnation. To fabricate desirable composites for underwater applications, hollow glass microspheres (HGMs), TPU prepared from poly(tetramethylene glycol) (PTMG), and methyl diphenyl diisocyanate (MDI) were used. TPU-grafted hollow glass microspheres (TPU-g-HGM) were prepared to fabricate a composite that has better interfacial adhesion between the TPU matrix and the HGMs. The tensile strength of the composite increased with increasing HGM content, whereas the swelling ratio and density of the composite decreased with increasing HGM content. At fixed HGM content in the composite, the TPU/TPU-g-HGM composite exhibited a lower swelling ratio and better tensile strength than the TPU/HGM composite. In addition, the TPU/TPU-g-HGM composite exhibited enhanced mechanical strength as compared to TPU after being impregnated with seawater and paraffin oil. DEWEY : 660 ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=24239044 [article] Fabrication of novel polyurethane elastomer composites containing hollow glass microspheres and their underwater applications [texte imprimé] / Hyungu Im, Auteur ; Sang Chul Roh, Auteur ; Chang Keun Kim, Auteur . - 2011 . - pp. 7305-7312. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 50 N° 12 (Juin 2011) . - pp. 7305-7312 Mots-clés : Microsphere  Hollow  glass  Composite  material Résumé : Thermoplastic polyurethane (TPU) elastomers are frequently used in underwater applications. Desirable polymeric materials have lower densities and lower swelling ratios for seawater and paraffin oil, along with better mechanical strength than TPU after impregnation. To fabricate desirable composites for underwater applications, hollow glass microspheres (HGMs), TPU prepared from poly(tetramethylene glycol) (PTMG), and methyl diphenyl diisocyanate (MDI) were used. TPU-grafted hollow glass microspheres (TPU-g-HGM) were prepared to fabricate a composite that has better interfacial adhesion between the TPU matrix and the HGMs. The tensile strength of the composite increased with increasing HGM content, whereas the swelling ratio and density of the composite decreased with increasing HGM content. At fixed HGM content in the composite, the TPU/TPU-g-HGM composite exhibited a lower swelling ratio and better tensile strength than the TPU/HGM composite. In addition, the TPU/TPU-g-HGM composite exhibited enhanced mechanical strength as compared to TPU after being impregnated with seawater and paraffin oil. DEWEY : 660 ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=24239044