Ultra Low Density and Highly Crosslinked Biocompatible Shape Memory Polyurethane Foams.
Ultra Low Density and Highly Crosslinked Biocompatible Shape Memory Polyurethane Foams.
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DOI:
10.1002/polb.23056
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发表时间:
2012-05-15
影响因子:
--
通讯作者:
Wilson, Thomas S.
中科院分区:
文献类型:
--
作者:
Singhal, Pooja;Rodriguez, Jennifer N.;Small, Ward;Eagleston, Scott;de Water, Judy Van;Maitland, Duncan J.;Wilson, Thomas S.
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 (Tg) 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 Tg 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 to controls demonstrates low acute bio-reactivity. We believe these porous polymeric scaffolds constitute an important class of novel smart biomaterials with multiple potential applications.
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通讯作者:
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