Triple shape memory effect of star-shaped polyurethane.
Triple shape memory effect of star-shaped polyurethane.
复制标题
DOI：
10.1021/am5001344
复制
发表时间：
2014-05
影响因子：
9.5
通讯作者：
Xifeng Yang;Lin Wang;Wenxi Wang;Hongmei Chen;Guang Yang;Shaobing Zhou
中科院分区：
文献类型：
--
作者：
Xifeng Yang;Lin Wang;Wenxi Wang;Hongmei Chen;Guang Yang;Shaobing Zhou
以不同臂数的星形聚己内酯（SPCL）为软段，4，4 ′-二苯基甲烷二异氰酸酯（MDI）和扩链剂1，4-丁二醇（BDO）为硬段，合成了一种星形聚氨酯（SPU）。质子核磁共振（1H-NMR）证实了材料的化学结构。差示扫描量热（DSC）和动态力学分析（DMA）结果表明，随硬段组成的增加，SPU的熔融温度（Tm）和转变温度（Ttranss）均降低。X射线衍射（XRD）结果表明，随着六臂星形聚氨酯（6S-PU）臂数的增加，SPU的结晶度增加，从而使6S-PU具有较高的形状固定性和较宽的熔融温度范围，从而使6S-PU具有优异的三重形状记忆效应。通过阿利兰法对成骨细胞进行体外细胞毒性试验，结果表明该共聚物具有良好的细胞相容性。该材料有望成为生物材料领域的一种新型智能材料。
In this study, we synthesized one type of star-shaped polyurethane (SPU) with star-shaped poly(ε-caprolactone) (SPCL) containing different arm numbers as soft segment and 4,4'-diphenyl methane diisocyanate (MDI) as well as chain extender 1,4-butylene glycol (BDO) as hard segment. Proton nuclear magnetic resonance (1H-NMR) confirmed the chemical structure of the material. Differential scanning calorimetry (DSC) and dynamic mechanical analysis (DMA) results indicated that both the melting temperature (Tm) and transition temperature (Ttrans) of SPU decreased with the hard segment composition increase. X-ray diffraction (XRD) results demonstrated that the increase of the crystallinity of SPU following the raised arm numbers endowed a high shape fixity of six-arm star-shaped polyurethane (6S-PU) and a wide melting temperature range, which resulted in an excellent triple-shape memory effect of 6S-PU. The in vitro cytotoxicity assay evaluated with osteoblasts through Alamar blue assay demonstrates that this copolymer possessed good cytocompatibility. This material can be potentially used as a new smart material in the field of biomaterials.