Cycloaliphatic polyester-based high-solids polyurethane coatings: II. The effect of difunctional acid

Two series of polyesters were synthesized with isomeric cyclohexane diacids. The first series of polyesters was synthesized with 1,4-cyclohexanedimethanol (CHDM) and three cycloaliphatic difunctional acids, 1,4-cyclohexanedicarboxylic acid (1,4-CHDA), 1,3-cyclohexanedicarboxylic acid (1,3-CHDA), or...

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Bibliographic Details
Published in:Progress in organic coatings 2002-09, Vol.45 (1), p.49-58
Main Authors: Ni, Hai, Daum, Jeremy L., Thiltgen, Pauline R., Soucek, Mark D., Simonsick, William J., Zhong, Wenqing, Skaja, Allen D.
Format: Article
Language:English
Subjects:
Applied sciences
Coatings. Paints, varnishes and inks
Components, formulation
Cycloaliphatic acids
Difunctional acid
Exact sciences and technology
Polyester
Polymer industry, paints, wood
Polyurethane coatings
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Summary:Two series of polyesters were synthesized with isomeric cyclohexane diacids. The first series of polyesters was synthesized with 1,4-cyclohexanedimethanol (CHDM) and three cycloaliphatic difunctional acids, 1,4-cyclohexanedicarboxylic acid (1,4-CHDA), 1,3-cyclohexanedicarboxylic acid (1,3-CHDA), or hexahydrophthalic anhydride (HHPA). The second series was prepared with 1,4-CHDA and 1,3-CHDA with CHDM. Control polyesters with adipic, azelaic, and isophthalic acid (AA, AZA, IPA) were prepared for comparison. The solubility and viscosity of polyesters were investigated using the common solvent methyl ethyl ketone (MEK). All the polyesters were cross-linked with hexamethylene diisocyanate (HDI) isocyanurate, forming polyurethane films. General coatings, tensile, and viscoelastic properties were evaluated for the cured polyurethane films. In addition, fracture toughness and the mode of energy dissipation were investigated. The polyesters based on cycloaliphatic diacids have better solubility in MEK compared to the polyesters based on the aromatic or linear aliphatic diacids. The cycloaliphatic diacids based polyurethane coatings had intermediate mechanical and viscoelastic properties compared to polyurethane based on aromatic and linear aliphatic diacids. In addition, the cycloaliphatic diacids afforded polyurethane with a greater adhesion on aluminum substrate compared to the aromatic diacid, IPA.
ISSN:0300-9440
1873-331X
DOI:10.1016/S0300-9440(02)00100-5