Abstract
We report the development of highly chemically crosslinked, ultra low density (-0.015 g/cc) polyurethane shape memory foams synthesized from symmetrical, low molecular weight, and branched hydroxyl monomers. Sharp single glass transitions (T g) customizable in the functional range of 45-70 °C were achieved. Thermomechanical testing confirmed shape memory behavior with 97-98% shape recovery over repeated cycles, a glassy storage modulus of 200-300 kPa, and recovery stresses of 5-15 kPa. Shape holding tests under constrained storage above the T g showed stable shape memory. A high volume expansion of up to 70 times was seen on actuation of these foams from a fully compressed state. Low in vitro cell activation induced by the foam compared with controls demonstrates low acute bio-reactivity. We believe these porous polymeric scaffolds constitute an important class of novel smart biomaterials with multiple potential applications.
Original language | English (US) |
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Pages (from-to) | 724-737 |
Number of pages | 14 |
Journal | Journal of Polymer Science, Part B: Polymer Physics |
Volume | 50 |
Issue number | 10 |
DOIs | |
State | Published - May 15 2012 |
Keywords
- aneurysm
- low density foams
- polyurethane
- secondary-shape forming
- shape memory polymer
ASJC Scopus subject areas
- Materials Chemistry
- Polymers and Plastics
- Condensed Matter Physics
- Physical and Theoretical Chemistry