Journal
MACROMOLECULAR CHEMISTRY AND PHYSICS
Volume 215, Issue 24, Pages 2420-2429Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/macp.201400407
Keywords
actuation rate; hydrophobicity; polyurethanes; shape-memory polymers; working time
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Funding
- National Institutes of Health/National Institute of Biomedical Imaging and Bioengineering [R01EB000462]
- Texas A&M University Graduate Diversity Fellowship
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Previously developed shape-memory polymer foams display fast actuation in water due to plasticization of the polymer network. The actuation presents itself as a depression in the glass-transition temperature when moving from dry to aqueous conditions; this effect limits the working time of the foam to 10 min when used in a transcatheter embolic device. Reproducible foams are developed by altering the chemical backbone, which can achieve working times of greater than 20 min. This is accomplished by incorporating isophorone diisocyanate into the foam, resulting in increased hydrophobicity, glass transitions, and actuation time. This delayed actuation, when compared with previous systems, allows for more optimal working time in clinical applications.
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