Preparation and properties of waterborne polyurethaneurea consisting of fluorinated siloxane units
A series of polyurethaneurea (PUTJ) aqueous dispersions were prepared via a prepolymer process from polyester polyol, α,ω-dihydroxypoly[(3,3,3- trifluoropropyl) methylsiloxane] (PTFPMS), dimethylolpropionic acid, isophorone diisocyanate, and ethylenediamine. These anionic-type aqueous dispersions were stable at the ambient temperature for more than 6 months, with particle sizes ranging from 69 to 127 nm. For these aqueous dispersions, the surface tension decreased with increasing PTFPMS content, but the particle size increased with a maximum value. The film prepared from the PUU aqueous dispersion consisting of 5 wt % PTFPMS (APU-FS-5) exhibited excellent waterproof performance. Furthermore, the tensile strength of the APU-FS-5 film increased nearly 3 times compared with that of the PUU film without PTFPMS, whereas the elongation at break only decreased a little; this indicated that the water-resistant and mechanical properties could be enhanced markedly and simultaneously for the PUU films containing both silicon and fluorine groups. The experimental results showed a high degree of hydrogen bonding for urea groups and an increased microphase-separation degree between the hard and soft segments in the PTFPMS-modified system, which resulted in the excellent mechanical properties of these films. © 2006 Wiley Periodicals, Inc.
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- Polymers
- 3406 Physical chemistry
- 3403 Macromolecular and materials chemistry
- 0912 Materials Engineering
- 0306 Physical Chemistry (incl. Structural)
- 0303 Macromolecular and Materials Chemistry
Citation
Published In
DOI
EISSN
ISSN
Publication Date
Volume
Issue
Start / End Page
Related Subject Headings
- Polymers
- 3406 Physical chemistry
- 3403 Macromolecular and materials chemistry
- 0912 Materials Engineering
- 0306 Physical Chemistry (incl. Structural)
- 0303 Macromolecular and Materials Chemistry