Hydroxyl‐terminated polybutadiene based waterborne polyurethane acrylate emulsions: Synthesis, characterization, and damping property

Abstract

A new kinds of waterborne polyurethane acrylate (WPUA) dispersions were synthesized based on isophorone diisocyanate (IPDI), hydroxyl‐terminated polybutadiene (HTPB), 1, 4‐butanediol (1, 4‐BDO), polytetramethylene ether glycol (PTMG), dimethylolpropionic acid (DMPA), 2‐ethylhexyl acrylate (EHA), and methyl methacrylate (MMA) as main raw materials. The influence of the HTPB content on the particle size, storage stability of the WPUA dispersions and the damping property of cured films were studied by using dynamic light scattering (DLS), dynamic mechanical analysis (DMA), respectively. It can be found the WPUA dispersions have a good stability and the damping temperature range of loss tangent (tan δ) >0.3 reaches a maximum (−26.6–79.14°C) when the content of HTPB is 20%. The HTPB based WPUA could be applied to damping material.

Waterborne polyurethane‐acrylate‐polyaniline: Interfacial hydrogen bonding for enhancing the antistatic, damping, and mechanical properties

“…The rigidity of the molecular chains increased, intermolecular friction and motion hysteresis inside the films were enhanced, and finally, the damping performance of the films increased. High damping materials require the effective damping temperature domain reaches 60 °C with tanδ ≥ 0.3 18,53,54 . In this study, the maximum value of the effective damping temperature domain was 87 °C.…”

“…The absorption peaks at 3669 cm −1 and 1530 cm −1 of the pure WPUA curve were attributed to the stretching vibration of ─NH, 2862–2958 cm −1 to the stretching vibration peaks of CH 3 and CH 2 , and the sharp strong absorption peak at 1732 cm −1 was the characteristic absorption peak of the C═O groups 41,42 . The characteristic absorption peak at 2205–2270 cm −1 in isocyanate was absent, indicating that the ─NCO groups were all involved in the reaction 18,43 . After the addition of PANI to WPUA, due to the large amount of NH in PANI which can form hydrogen bonds with C═O in WPUA, the absorption peak of ─NH increases in peak intensity with PANI addition.…”

“…Water and ethylene glycol were used for testing, and the test temperature was 25 °C. The surface free energy of the films was calculated by Owens's Equation (2) and Wendt equation 18,19,34,35 (3): The θ in the above formula represents the contact angle of the films. represents the surface energy of the titration liquid used, and represents the surface energy of the films.…”

“…Although researchers have achieved excellent mechanical properties, heat resistance, and damping properties regarding WPU, some properties still need to be studied 9,15–17 . Firstly, the introduction of hydrophilic groups in the preparation of WPU weakens its water resistance 18–23 . This may accelerate the corrosion rate of the substrate material, thereby greatly reducing the service life of the equipment.…”

“…9,[15][16][17] Firstly, the introduction of hydrophilic groups in the preparation of WPU weakens its water resistance. [18][19][20][21][22][23] This may accelerate the corrosion rate of the substrate material, thereby greatly reducing the service life of the equipment. Polyacrylate (PA) has outstanding water resistance, solvent resistance, weather resistance, transparency, and affordability.…”