Shape memory polymers based on semicrystalline thermoplastic polyurethanes bearing nanostructured hard segments
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United States of America Patent
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Aug 15, 2006
Grant Date -
Jun 17, 2004
app pub date -
Oct 10, 2003
filing date -
Oct 11, 2002
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Abstract
Thermoplastic polyurethanes having an alternating sequence of hard and soft segments in which a nanostructured polyhedral oligomeric silsesquioxane diol is used as a chain extender to form a crystalline hard segment constituting SMPs. The polyurethanes are formed by reacting a polyol, a chain extender dihydroxyl-terminated POSS and a diisocyanate. The polyurethanes have multiple applications including for example, implants for human health care, drug delivery matrices, superabsorbant hydrogels, coatings, adhesives, temperature and moisture sensors, etc.
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