Visiting Scholar from Nanjing University, Department of Chemistry, People's Republic of China.
Synthesis and physical properties of poly(fluoroalkylether)urethanes
Article first published online: 10 MAR 2003
Copyright © 1990 John Wiley & Sons, Inc.
Journal of Applied Polymer Science
Volume 41, Issue 7-8, pages 1777–1795, 1990
How to Cite
Yu, X.-H., Okkema, A. Z. and Cooper, S. L. (1990), Synthesis and physical properties of poly(fluoroalkylether)urethanes. J. Appl. Polym. Sci., 41: 1777–1795. doi: 10.1002/app.1990.070410734
- Issue published online: 10 MAR 2003
- Article first published online: 10 MAR 2003
- Manuscript Accepted: 20 NOV 1989
- Manuscript Received: 24 JUL 1989
Polyurethane block copolymers were synthesized containing between 33 and 50 wt % hard segments based on 4,4'-diphenylmethane diissocyanate (MDI) and either 1,4-butanediol (BD), or N-methyldiethanolamine (MDEA) as the chain extender. The soft segments were composed of poly(tetramethylene oxide) (PTMO) and fluoropolyether glycol (FPEG) oligomers (Mn = 1000 and 1899, respectively), copolymerized to produce polyurethanes containing 5–100 wt % FPEG soft segment. The PTMO polyol in one sample was substituted with a tetrahydrofuran/ethylene oxide polyol (75 : 25 mole ratio) (Mn = 1140). The MDEA-extended polymer was ionized using 1,3-propane sultone. The bulk and surface properties of these polymers were evaluated by a variety of techniques. Differential scanning calorimetry (DSC) and dynamic mechanical analysis showed that the incorporation of 5–14 wt % FPEG into the soft segment had essentially no effect on the polymer's multiphase structure. The ultimate tensile strength and elongation was reduced by the addition of FPEG. Chain extending with BD as opposed to MDEA improved phase separation and the ultimate tensile strength. In vacuum, surface enrichment of the low surface energy FPEG was observed for all the polymers, using X-ray photoelectron spectroscopy (XPS). The dynamic contact angle results indicate that the polymer surfaces rearranged in an aqueous environment to minimize their interfacial free energy.