Studies on waterborne polyurethanes based on new medium length fluorinated diols

• Published in: Journal of fluorine chemistry Vol. 175; pp. 12 - 17
• Main Authors: Li, Junpei, Zhang, Xingyuan, Liu, Zheng, Li, Weihu, Dai, Jiabing
• Format: Journal Article
• Language: English
• Published: LAUSANNE Elsevier B.V 01.07.2015; Elsevier
• Subjects: Chemistry; Chemistry, Inorganic & Nuclear; Chemistry, Organic; Medium length fluorinated diols; Physical Sciences; Polyurethane emulsion; Science & Technology; Surface tension; Swelling ratio; Water contact angle; Water contact angle; Surface tension; Polyurethane emulsion; Swelling ratio; Medium length fluorinated diols; ACRYLATE HYBRID DISPERSIONS; EMULSION; CHAINS; ALIPHATIC POLYURETHANES; BEHAVIORS
• ISSN: 0022-1139; 1873-3328
• DOI: 10.1016/j.jfluchem.2015.02.015

The water/organic solvent resistance, thermal stability and mechanical properties of the resulting fluorinated waterborne polyurethanes were all improved. It was found that the fluorine content increased from 0 to 15.1%, and the tensile strengths increased from 9MPa to 15MPa, whereas the extensibility decreased from 520% to 280%. •WPU with fluorinated medium branched chain were synthesized.•Water/solvent resistance, thermal and mechanical properties of WPU were improved.•Effect of physical properties on WPU with fluorine content was well studied.•This study opens a window to produce high-performance polyurethane materials. A novel fluorinated diol 3-(bis-(N,N-dihydroxyethyl)) dodecafluoroheptyl acrylate (DEFA) was for the first time synthesized via Michael addition reaction between diethanolamine and dodecafluoroheptyl acrylate, followed by a series of waterborne fluorinated polyurethane emulsions IPDI-DEFA-PU synthesis using isophorone diisocyanate (IPDI), poly(tetramethylene oxide glycol) (PTMG), dimethylolpropionic acid (DMPA) and 1,4-butanediol (BDO) as main starting materials, and DEFA as a chain extender. The structure of DEFA and IPDI-DEFA-PU was confirmed by Fourier transform infrared (FTIR) spectroscopy and proton nuclear magnetic resonance (1H NMR). It was found that the fluorine content increased from 0 to 15.1%, and the particle size of emulsion increased from 102nm to 260nm, whereas the surface tension of latex film decreased from 42.9mN/m to 16.5mN/m; while the water contact angle increased from 71° to 104°, the swelling ratio of latex film in water and cyclohexane decreased from 15.8% to 1.1% and from 28.8% to 3.4%, respectively. Meanwhile, water/organic solvent resistance and thermal stability, mechanical properties of IPDI-DEFA-PU were all improved. As tensile strength increased from 9MPa to 15MPa, extensibility decreased from 520% to 280%.