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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Nanostructured polyurethane ceramer coatings for aircraft / Mark D. Soucek in JOURNAL OF COATINGS TECHNOLOGY (JCT), Vol. 74, N° 933 (10/2002)

[article]  inJOURNAL OF COATINGS TECHNOLOGY (JCT) > Vol. 74, N° 933 (10/2002) . - p. 125-134 Titre : Nanostructured polyurethane ceramer coatings for aircraft Type de document : texte imprimé Auteurs : Mark D. Soucek, Auteur ; Hai Ni, Auteur Année de publication : 2002 Article en page(s) : p. 125-134 Note générale : Bibliogr. Langues : Américain (ame) Tags : Microstructure  Ténacité  Résistance  traction  Propriété  mécanique  Feuil  Préparation  Liant  Formulation  Industrie  aéronautique  Céramique  Polymère  Matériau  composite  Peinture  revêtement Index. décimale : 667.9 Revêtements et enduits Résumé : A new low VOC (volatile organic compounds) polyurethane/oligosiloxane coating was formulated using 1,6-hexamethylene diisocyanate (HDI) isocyanurate, alkoxysilane-functionalized HDI isocyanurate, tetraethyl orthosilicate (TEOS) oligomers, and three cycloaliphatic polyesters. One series of polyesters was synthesized using 1,4-cyclohexanedimethanol (CHDM) with 1,4-cyclohexanedicarboxylic acid (1,4-CHDA) and 1,3-cyclohexanedicarboxylic acid (1,3-CHDA). A second series of polyesters was synthesized using 2-butyl-2-ethyl-1,3-propanediol (BEPD) with 1,4-CHDA or 1,4-CHDA, and 1,3-CHDA, respectively. The polyurethane provided the general mechanical properties and the polysiloxane functioned as an adhesion promoter and corrosion inhibitor. The continuous organic polyurethane phase was coupled with the inorganic polysiloxane phase via the alkoxysilane-functionalized HDI isocyanurate. The general coatings, tensile, and viscoelastic properties were evaluated for the ceramer coatings as functions of the polyester and concentration of TEOS oligomers. Damage tolerance was evaluated via fracture toughness and development of the film deformation zone prior to crack propagation. The coatings'properties were dominated by the organic phase. The film morphology was investigated using the combination of SEM (scanning electron microscope) and X-ray analysis. Phase separation was observed for ceramer coatings resulting in SiO2 particles. The size of the preceramic silicon-oxo-particles was controlled by the Tg of the organic phase and the concentration of TEOS oligomers. Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=5619 [article]

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