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Polythiourethane Covalent Adaptable Networks for Strong and Reworkable Adhesives and Fully Recyclable Carbon Fiber-Reinforced Composites
ACS Applied Materials & Interfaces ( IF 8.3 ) Pub Date : 2020-09-28 , DOI: 10.1021/acsami.0c14189
Chenhui Cui 1 , Xingxing Chen 1 , Li Ma 1 , Qianyun Zhong 1 , Zhen Li 1 , Arumugam Mariappan 1 , Qiang Zhang 1 , Yilong Cheng 1 , Gang He 2 , Xiaoming Chen 3 , Zhen Dong 4 , Le An 5 , Yanfeng Zhang 1, 6
Affiliation  

The development of adhesives with superior optical and mechanical performance, solvent resistance, and reworkability is gaining increasing attention in recent years. However, traditional materials do not possess reprocessability and healing characteristics for sustainable development. Here, a superior dynamic polythiourethane (PTU) adhesive with high reprocessability was developed by introducing covalent adaptable networks (CANs). Specifically, dynamic thiocarbamate bonds (TCB) were used to prepare PTU CANs, which showed dramatically enhanced malleability and recyclability. The Young’s modulus of the material was 2.0 GPa and the tensile strength was 62.7 MPa. The reprocessing temperature of CANs was reduced to 80 °C while more than 90% of their mechanical properties were retained, even after being reprocessed several times. Moreover, the highly transparent and water-resistant PTU CANs featured an excellent bonding property and reworkability for various materials including glass, with a lap shear strength of 2.9 MPa, metal (5.1 MPa), and wood (6.3 MPa), compared with commercially available adhesives. Additionally, carbon fiber-reinforced composites constructed with PTU CANs were capable of being fully recycled and reused. Importantly, laminated glass with a toughened PTU–PU elastomer interface exhibited an outstanding impact fatigue-resistance behavior, sustaining thousands of impacts. These features demonstrate that PTU CANs show great potential as sustainable materials.

中文翻译:

聚硫氨酯共价适应性网络,用于牢固和可修复的粘合剂以及可完全回收的碳纤维增强复合材料

近年来,具有优异的光学和机械性能,耐溶剂性和可返工性的胶粘剂的开发越来越受到关注。但是,传统材料不具有可持续发展的可再加工性和愈合特性。在此,通过引入共价适应性网络(CAN),开发了具有高可再加工性的优异动态聚硫氨酯(PTU)粘合剂。具体而言,动态硫代氨基甲酸酯键(TCB)用于制备PTU CAN,它具有显着增强的延展性和可回收性。该材料的杨氏模量为2.0GPa,抗拉强度为62.7MPa。CAN的后处理温度降低到80°C,同时保留其90%以上的机械性能,即使经过多次处理也是如此。此外,与市售的胶粘剂相比,这种高度透明和防水的PTU CAN具有出色的粘合性能和可加工性,可用于多种材料,包括玻璃,搭接剪切强度为2.9 MPa,金属(5.1 MPa)和木材(6.3 MPa)。此外,使用PTU CAN构造的碳纤维增强复合材料能够完全回收再利用。重要的是,具有强化PTU-PU弹性体界面的夹层玻璃具有出色的抗冲击疲劳性能,可承受数千次冲击。这些功能证明PTU CAN作为可持续材料具有巨大的潜力。与市售的胶粘剂相比。此外,使用PTU CAN构造的碳纤维增强复合材料能够完全回收再利用。重要的是,具有强化PTU-PU弹性体界面的夹层玻璃具有出色的抗冲击疲劳性能,可承受数千次冲击。这些功能证明PTU CAN作为可持续材料具有巨大的潜力。与市售的胶粘剂相比。此外,使用PTU CAN构造的碳纤维增强复合材料能够完全回收再利用。重要的是,具有强化PTU-PU弹性体界面的夹层玻璃具有出色的抗冲击疲劳性能,可承受数千次冲击。这些功能证明PTU CAN作为可持续材料具有巨大的潜力。
更新日期:2020-10-21
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