Interdependence of structure and properties in segmented polyurethanes
โ Scribed by J. Foks; H. Janik; S. Winiecki
- Publisher
- John Wiley and Sons
- Year
- 1982
- Tongue
- English
- Weight
- 536 KB
- Volume
- 27
- Category
- Article
- ISSN
- 0021-8995
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Structure and viscoelastic properties of segmented polyurethanurea (SPU) blends were investigated. The glass transition temperature (T,) of poly(tetramethy1ene glycohol) (PTMG) in a soft-segment block of the component SPU increased with decreasing molecular weight of PTMG. The blend samples showed t
## Abstract Various segmented polyurethanes with a hard segment content of about 50 wt% were prepared from 4,4โฒโdiphenylmethane diisocyanate (MDI), a poly(tetramethylene adipate) glycol with an __M__~n~ of 2000, and various combinations of aliphatic diols as chain extenders by a oneโshot, handโcast
Polyurethanes, containing well-defined assemblies of perfluoro-polyether (PFPE or hexafluoropropene oxide oligomer), polydimethylsiloxane (PDMS), and polyethylene glycol (PEG) segments, exhibit oleophobic, hydrophobic, and hydrophilic properties in response to the polarity of the contacting medium.
Two series of segmented polyurethanes, one containing 50% soft segments and the other with 70% soft segments were synthesized. Chemical crosslinks were introduced through the hard segment in a controlled way. Chemical polyurethane networks were characterized by swelling. The effect of the degree of