Polyethylenimine‐Based Shape Memory Polyurethane with Low Transition Temperature and Excellent Memory Performance,Macromolecular Materials and Engineering

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Polyethylenimine‐Based Shape Memory Polyurethane with Low Transition Temperature and Excellent Memory Performance
Macromolecular Materials and Engineering ( IF 4.2 ) Pub Date : 2020-06-22 , DOI: 10.1002/mame.202000215
Hema Garg ₁ , Jayashree Mohanty ₁ , Priyanka Gupta ₂ , Apurba Das ₂ , Bijay P. Tripathi ₃ , Bipin Kumar ₂

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Flexible shape memory polyurethanes (SMPUs) are the favorable candidates as a coating or substrate for wearable smart textiles, electronics, and biomedical applications. However, conventional SMPUs (e.g., 1,4 butanediol (BDO)‐based) are not suitable in these applications due to high rigidity, poor mechanical properties, low shape recovery, and high transition temperature. Herein, a polyethylenimine (PEI)‐based SMPU with low transition temperature and tailored properties are reported. The synthesized SMPU are characterized, and their properties are compared with BDO‐SMPUs. The chemical structure of PEI is explored to improve thermal and mechanical properties and to assess their effect on shape memory behavior. The bulky nature of PEI plays a critical role in lowering transition temperature and introduces flexibility in the structure at room temperature. A drop in Young's modulus is found from 13.6 MPa in BDO‐SMPU to 6.2 MPa in PEI‐SMPU. Simultaneously, tensile strength is increased from 3.77 MPa in BDO‐SMPU to 11.85 MPa in PEI‐SMPU. Owing to the improved mechanical properties in PEI‐SMPU, 100% shape recovery is observed, which displays a reproducible trend in ten repetitive cycles due to the presence of reversible physical crosslinks. Therefore, it is envisioned that this can serve as a potential shape memory material in smart wearable technologies.

中文翻译：

具有低转变温度和出色记忆性能的基于聚乙烯亚胺的形状记忆聚氨酯

柔性形状记忆聚氨酯（SMPU）是可穿戴智能纺织品，电子产品和生物医学应用的涂层或基材的理想选择。但是，传统的SMPU（例如1,4丁二醇（BDO）基）由于其高刚性，较差的机械性能，较低的形状恢复性和较高的转变温度而不适用于这些应用。本文报道了一种基于聚乙烯亚胺（PEI）的SMPU，具有较低的转变温度和定制的性能。表征了合成的SMPU，并将其性能与BDO-SMPU进行了比较。对PEI的化学结构进行了研究，以改善其热和机械性能，并评估它们对形状记忆行为的影响。PEI的庞大性质在降低转变温度中起着关键作用，并在室温下为结构引入了灵活性。发现杨氏模量从BDO-SMPU中的13.6 MPa下降到PEI-SMPU中的6.2 MPa。同时，抗拉强度从BDO-SMPU中的3.77 MPa增加到PEI-SMPU中的11.85 MPa。由于PEI-SMPU的机械性能有所改善，因此观察到100％的形状恢复，由于存在可逆的物理交联，它在十个重复循环中显示出可重复的趋势。因此，可以预见它可以用作智能可穿戴技术中潜在的形状记忆材料。由于PEI-SMPU的机械性能有所改善，观察到100％的形状恢复，由于存在可逆的物理交联，它在十个重复循环中显示出可重复的趋势。因此，可以预见它可以用作智能可穿戴技术中潜在的形状记忆材料。由于PEI-SMPU的机械性能有所改善，因此观察到100％的形状恢复，由于存在可逆的物理交联，它在十个重复循环中显示出可重复的趋势。因此，可以预见它可以用作智能可穿戴技术中潜在的形状记忆材料。

更新日期：2020-08-12

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