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.
Wilson, Thomas S.
中科院分区:
工程技术3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.

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我们报道了由对称的、低分子量的和支链的羟基单体合成的高度化学交联的、超低密度(~0.015 g/cc)的聚氨酯形状记忆泡沫的开发。实现了在45-70 °C的功能范围内可定制的尖锐单一玻璃化转变(Tg)。热机械测试证实了形状记忆行为,在重复循环中具有97-98%的形状恢复,200-300 kPa的玻璃态储能模量和5-15 kPa的恢复应力。在高于Tg的约束储存下的形状保持测试显示稳定的形状记忆。在从完全压缩状态致动这些泡沫时,观察到高达70倍的高体积膨胀。与对照相比,泡沫诱导的体外细胞活化较低,表明急性生物反应性较低。我们相信这些多孔聚合物支架构成了一类重要的新型智能生物材料,具有多种潜在的应用。
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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