Polythiourethane Covalent Adaptable Networks for Strong and Reworkable Adhesives and Fully Recyclable Carbon Fiber-Reinforced Composites
Polythiourethane Covalent Adaptable Networks for Strong and Reworkable Adhesives and Fully Recyclable Carbon Fiber-Reinforced Composites
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用于强力、可再加工粘合剂和完全可回收碳纤维增强复合材料的聚硫氨酯共价适应性网络
DOI：
10.1021/acsami.0c14189
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发表时间：
2020-10-21
影响因子：
9.5
通讯作者：
Zhang, Yanfeng
中科院分区：
文献类型：
--
作者：
Cui, Chenhui;Chen, Xingxing;Zhang, Yanfeng
近年来，具有优异的光学性能、机械性能、耐溶剂性和可维护性的胶粘剂的开发受到越来越多的关注。然而，传统材料不具备可持续发展的可再加工性和愈合特性。通过引入共价自适应网络(CANS)，研制出了一种具有高再加工性的高性能动态聚硫醚(PTU)胶粘剂。具体地说，使用动态硫代氨基甲酸键(TCB)来制备PTU罐，显示出显著增强的延展性和可回收性。该材料的杨氏模量为2.0 GPA，拉伸强度为62.7 Mpa。罐头的再加工温度降至80摄氏度，即使经过多次再加工，其力学性能仍保持90%以上。此外，高度透明和防水的PTU罐具有良好的粘接性能和可再加工性，可用于各种材料，包括玻璃、金属(5.1 Mpa)和木材(6.3 Mpa)的搭接剪切强度，与商用胶粘剂相比。此外，用PTU罐建造的碳纤维增强复合材料能够完全回收和再利用。重要的是，具有增韧PTU-PU弹性体界面的夹层玻璃表现出出色的抗冲击疲劳性能，可承受数千次冲击。这些特点表明，PTU罐作为可持续材料显示出巨大的潜力。
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 degrees 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.