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Synthesis and characterization of UV‐curable waterborne polyurethane–acrylate ionomers for coatings
Author(s) -
Wang Zhiming,
Gao Dongbo,
Yang Jianwen,
Chen Yonglie
Publication year - 1999
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/(sici)1097-4628(19990929)73:14<2869::aid-app10>3.0.co;2-s
Subject(s) - prepolymer , materials science , polyurethane , differential scanning calorimetry , polymer chemistry , gloss (optics) , acrylate , chemical engineering , ionomer , polyethylene glycol , methacrylate , peg ratio , polymer , fourier transform infrared spectroscopy , thermal stability , copolymer , composite material , coating , physics , finance , economics , engineering , thermodynamics
A new kind of ultraviolet (UV)‐curable waterborne polyurethane–acrylate (PUA) ionomer, prepared from toluene diisocyanate (TDI), polyethylene glycol (PEG), dimethylolpropionic acid (DMPA), triethylamine (TEA), and 2‐hydroxyethyl methacrylate (HEMA), was synthesized by the modified prepolymer mixing process in which water serves as a chain‐extender and dispersant. Fourier transform infrared (FTIR) spectra demonstrated the formation of the PUA ionomers both in dispersions and in their corresponding cured films. Surface tension of the PUA dispersions decreased as the DMPA‐to‐PEG mole ratio increased. The investigation of rheological behavior of the PUA dispersions suggested that all the dispersions belong to pseudoplastic fluid and display the characteristic of common polymer dispersions. Differential scanning calorimetry (DSC) analysis showed that the increasing DMPA‐to‐PEG mole ratio may result in a higher T g and a broader transition zone for the hard segment. The results of TGA for the PUA‐cured films indicated good thermal stability with no appreciable weight loss until well above 200°C. Measurement of physical properties showed that all the PUA‐cured films exhibited excellent adhesion, gloss, flexibility, and impact strength, as well as pendulum hardness, depending upon hard segment content. © 1999 John Wiley & Sons, Inc. J Appl Polym Sci 73: 2869–2876, 1999