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New polymeric polyol for thermoset coatings / J. Frederic Walker in JOURNAL OF COATINGS TECHNOLOGY (JCT), Vol. 74, N° 928 (05/2002)

[article]  inJOURNAL OF COATINGS TECHNOLOGY (JCT) > Vol. 74, N° 928 (05/2002) . - p. 33-47 Titre : New polymeric polyol for thermoset coatings : Superacid-catalyzed copolymerization of water and epoxy resins Type de document : texte imprimé Auteurs : J. Frederic Walker, Auteur ; John B. Dickenson, Auteur ; Charles R. Hegedus, Auteur ; Frank R. Pepe, Auteur ; Renee Keller, Auteur Année de publication : 2002 Article en page(s) : p. 33-47 Note générale : Bibliogr. Langues : Américain (ame) Tags : Etude  expérimentale  Feuil  Propriété  mécanique  physique  chimique  Polymérisation  solution  Ether  Bisphénol  A  Eau  Copolymérisation  émulsion  Polyol  Superacide  Catalyse  acide  Epoxyde  résine  Liant  Formulation  Thermodurcissable  Peinture  Matériau  revêtement Index. décimale : 667.9 Revêtements et enduits Résumé : Though free-radical emulsion polymerization has been studied extensively, published reports of cationic (i.e., acid-catalyzed) polymerizations of emulsified monomers are rare. It was recently discovered that treatment of an emulsion of liquid epoxy resin with select superacid catalysts yields a polymeric polyol. Catalysis with one percent perchloric acid at room temperature yields a product with a number average molecular weight of 1650, and a polydispersity of 5.0 as measured by GPC. The polyol's structure differs from that of conventional high molecular weight epoxy resins prepared by the advancement process in several ways, including the incorporation of two glycidyl units in the repeat unit. In essence, the product is a copolymer of the epoxy resin and water, in which water is incorporated in the repeat unit structure by reaction with two epoxide groups. A similar product can be prepared by solution polymerization, where the molecular weight is controlled by the ratio of water to epoxy resin. The product was shown to have lower levels of residual bisphentol-A diglycidyl ether (BADGE) and bisphenol-A than conventional advanced epoxy resins. Polyols prepared by these new processes were crosslinked with melamine-formaldehyde resins in waterborne coating formulations which were free of added cosolvent, as well as solventborne coating formulations. The coatings de veloped excellent solvent resistance at lower bake temperatures than traditional epoxy resins. Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=5648 [article]

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Cycloaliphatic polyester based high solids polyurethane coatings / Hai Ni in JOURNAL OF COATINGS TECHNOLOGY (JCT), Vol. 74, N° 928 (05/2002)

[article]  inJOURNAL OF COATINGS TECHNOLOGY (JCT) > Vol. 74, N° 928 (05/2002) . - p. 49-56 Titre : Cycloaliphatic polyester based high solids polyurethane coatings : I. The effect of difunctional alcohols Type de document : texte imprimé Auteurs : Hai Ni, Auteur ; Jeremy L. Daum, Auteur ; Mark D. Soucek, Auteur ; William J. Simonsick, Auteur Année de publication : 2002 Article en page(s) : p. 49-56 Note générale : Bibliogr. Langues : Américain (ame) Tags : Etude  expérimentale  Viscoélasticité  Propriété  rhéologique  Résistance  traction  Ténacité  mécanique  Feuil  Préparation  Ester  polymère  Formulation  Uréthanne  Liant  Peinture  haute  teneur  solide  Matériau  revêtement Index. décimale : 667.9 Revêtements et enduits Résumé : High-solids polyesters were synthesized with two cycloaliphatic diacids, 1,4-cyclohexanedicarboxylic acid (1,4- HDA) and 1,3-cyclohexanedicarboxylic acid (1,3-CHDA), and with five diols, 1,4-cyclohexanedimethanol (CHDM), neopentyl glycol (NPG), hydroxypivalyl hydroxypivalate (HPHP), 2-butyl-2-ethyl-1,3-propanediol (BEPD), and 1,6-hexanediol (HD). The viscosity of the polyesters was dependent on the structures of diols. The viscosity of polyesters is lower with the diol HD, intermediate with BEPD and HPHP, and higher with the diols CHDM and NPG. The polyesters were crosslinked with hexamethylene diisocyanate isocyanurate (HDI isocyanurate) affording polyurethane coatings. The mechanical properties, tensile properties, fracture toughness, and viscoelastic properties were investigated for the polyurethane films with five different diols. The cyclohexyl structure of the CHDM provides the polyurethane with rigidity which is manifested in high tensile modulus, hardness, and fracture toughness. In contrast, the linear diol, 1,6-hexanediol provides polyurethane with very high flexibility, but these coatings suffer with respect to low hardness and tensile modulus. Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=5649 [article]

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Structure control, coating properties, and durability of fluorinated acrylic - based polymers / Valter Castelvetro in JOURNAL OF COATINGS TECHNOLOGY (JCT), Vol. 74, N° 928 (05/2002)

[article]  inJOURNAL OF COATINGS TECHNOLOGY (JCT) > Vol. 74, N° 928 (05/2002) . - p. 57-66 Titre : Structure control, coating properties, and durability of fluorinated acrylic - based polymers Type de document : texte imprimé Auteurs : Valter Castelvetro, Auteur ; Massimo Lazzari, Auteur ; Oscar Chiantore, Auteur ; Francesco Ciardelli, Auteur ; Mauro Aglietto, Auteur Année de publication : 2002 Article en page(s) : p. 57-66 Note générale : Bibliogr. Langues : Américain (ame) Tags : Etude  expérimentale  Pierre  Matériau  poreux  Utilisation  Durabilité  Feuil  Dégradation  photochimique  Vieillissement  Structure  chimique  Préparation  Vinylique  éther  copolymère  Copolymère  fluor  Acrylate  Liant  Formulation  Peinture  revêtement Index. décimale : 667.9 Revêtements et enduits Résumé : Fluorinated acrylates were employed for the synthesis of conventional, side-chain fluorinated, fully acrylic random copolymers, and of more unusual hybrid copolymers with vinyl ethers. The latter can feature alternating structure and peculiar material properties associated with fluorine or fluorinated groups substitution onto the polymer backbone. Improved efficacy and durability of the resulting coating, highly desirable for the consolidation and protection of highly valued works of art, was achieved through a systematic approach invoiving a detailed study of their photodegradation behavior, and extensive testing of protection efficacy upon application onto micro- and macroporous stone substrates of different chemical composition and morphology. Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=5664 [article]

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