High Performance Shape Memory Polyurethane Synthesized with High Molecular Weight Polyol as the Soft Segment
High Performance Shape Memory Polyurethane Synthesized with High Molecular Weight Polyol as the Soft Segment
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DOI：
10.3390/app2020535
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发表时间：
2012-06-01
影响因子：
2.7
通讯作者：
Luo, Jikui
中科院分区：
文献类型：
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作者：
Ahmad, Manzoor;Xu, Bin;Luo, Jikui
形状记忆聚氨酯 (SMPU) 通常使用低分子量（M-W 类似于 2,000 g/mol）的多元醇合成，因为人们相信这些低分子量多元醇中的高交联密度对于高机械强度和良好的形状记忆效果至关重要。本研究采用分子量约为6000 g/mol的聚乙二醇（PEG-6000）作为软段、二异氰酸酯作为硬段合成SMPU，并与聚己内酯PCL-2000制备的SMPU进行比较。研究表明，虽然基于PEG-6000的SMPU的最大断裂伸长率（425％）和恢复应力低于基于PCL的SMPU，但它们具有更好的恢复率（高达98％）和形状固定性（高达95％），因此具有更好的形状记忆效果。此外，与常见 SMPU 数十秒到几分钟的典型驱动时间相比，基于 PEG 的 SMPU 表现出更短的驱动时间，< 10 s，形状恢复高达 90%，这证明了它们在微系统和其他工程组件中的巨大应用潜力。
Shape memory polyurethanes (SMPUs) are typically synthesized using polyols of low molecular weight (M-W similar to 2,000 g/mol) as it is believed that the high density of cross-links in these low molecular weight polyols are essential for high mechanical strength and good shape memory effect. In this study, polyethylene glycol (PEG-6000) with M-W similar to 6000 g/mol as the soft segment and diisocyanate as the hard segment were used to synthesize SMPUs, and the results were compared with the SMPUs with polycaprolactone PCL-2000. The study revealed that although the PEG-6000-based SMPUs have lower maximum elongations at break (425%) and recovery stresses than those of PCL-based SMPUs, they have much better recovery ratios (up to 98%) and shape fixity (up to 95%), hence better shape memory effect. Furthermore, PEG-based SMPUs showed a much shorter actuation time of < 10 s for up to 90% shape recovery compared to typical actuation times of tens of seconds to a few minutes for common SMPUs, demonstrated their great potential for applications in microsystems and other engineering components.