Nurhamiyah Yeyen, Amir Amalina, Finnegan Marie, Themistou Efrosyni, Edirisinghe Mohan, Chen Biqiong
School of Mechanical and Aerospace Engineering, Queen's University Belfast, Stranmillis Road, Belfast BT9 5AH, United Kingdom.
Department of Mechanical Engineering, University College London, Torrington Place, London WC1E 7JE, United Kingdom.
ACS Appl Mater Interfaces. 2021 Feb 10;13(5):6720-6730. doi: 10.1021/acsami.0c23155. Epub 2021 Jan 26.
Renewable polymers with excellent stretchability and self-healing ability are interesting for a wide range of applications. A novel type of wholly biobased, self-healing, polyamide-based thermoplastic elastomer was synthesized using a fatty dimer acid and a fatty dimer amine, both containing multiple alkyl chains, through facile one-pot condensation polymerization under different polymerization times. The resulting elastomer shows superior stretchability (up to 2286%), high toughness, and excellent shape recovery after being stretched to different strains. This elastomer also displays high room-temperature autonomous self-healing efficiency after fracture and zero water uptake during water immersion. The highly entangled main chain, the multiple dangling chains, the abundant reversible physical bonds, the intermolecular diffusion, and the low ratio of amide to methylene group within the elastomer are responsible for these extraordinary properties. The polymerization time influences the properties of the elastomer. The use of the optimal self-healing thermoplastic elastomer in anticorrosion coating, piezoresistive sensing, and highly stretchable fibers is also demonstrated. The elastomer coating prevents stainless-steel products from corrosion in a salty environment due to its superhydrophobicity. The elastomer serves as a robust flexible substrate for creating self-healing piezoresistive sensors with excellent repeatability and self-healing efficiency. The elastomer fiber yarn can be stretched to 950% of its original length confirming its outstanding stretchability.
具有优异拉伸性和自愈能力的可再生聚合物在广泛的应用中具有吸引力。通过在不同聚合时间下进行简便的一锅法缩聚反应，使用均含有多个烷基链的脂肪二聚酸和脂肪二聚胺合成了一种新型的全生物基、自愈型聚酰胺基热塑性弹性体。所得弹性体表现出优异的拉伸性（高达2286%）、高韧性以及在拉伸至不同应变后出色的形状恢复能力。该弹性体在断裂后还表现出高室温自主自愈效率，并且在水浸过程中吸水率为零。弹性体内高度缠结的主链、多个悬垂链、丰富的可逆物理键、分子间扩散以及酰胺与亚甲基的低比例导致了这些非凡的性能。聚合时间会影响弹性体的性能。还展示了这种最佳自愈热塑性弹性体在防腐涂层、压阻传感和高拉伸纤维中的应用。由于其超疏水性，弹性体涂层可防止不锈钢产品在含盐环境中腐蚀。该弹性体作为一种坚固的柔性基材，可用于制造具有出色重复性和自愈效率的自愈压阻传感器。弹性体纤维纱线可拉伸至其原始长度的950%，证实了其出色的拉伸性。
