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Design of Robust and Recyclable Covalent Elastomeric Networks through Dynamic Enamine–Urea Bonds
Macromolecules ( IF 5.1 ) Pub Date : 2024-09-04 , DOI: 10.1021/acs.macromol.4c01686 Silong Chen 1 , Jian Ding 1 , Youlong Zhao 1 , Anqian Yuan 1 , Yansheng Liao 1 , Xingbao Chen 1 , Yuan Lei 1 , Liang Jiang 1 , Jingxin Lei 1 , Xiaowei Fu 1
Macromolecules ( IF 5.1 ) Pub Date : 2024-09-04 , DOI: 10.1021/acs.macromol.4c01686 Silong Chen 1 , Jian Ding 1 , Youlong Zhao 1 , Anqian Yuan 1 , Yansheng Liao 1 , Xingbao Chen 1 , Yuan Lei 1 , Liang Jiang 1 , Jingxin Lei 1 , Xiaowei Fu 1
Affiliation
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The design of ultrastrong and recyclable covalent elastomeric networks with new dynamic exchange chemistry remains a challenge. Herein, the new dynamic exchange chemistry of enamine-urea bonds (EUBs) was developed and introduced into covalent elastomeric networks of poly(enamine-urea)s (PEUs) integrating both unconjugated polyurethane chains and conjugated polypyrrole (PPy) chains, enabling ultrastrong mechanical strength and recyclability. The dynamic exchange chemistry of EUBs was verified by small molecule model experiments and stress relaxation of PEUs with EUBs was introduced. The PEUs exhibited superior tensile strength (41.41 ± 0.46 MPa), high stretchability (1482.03 ± 86.48%), and excellent catalyst-free recyclability and reprocessability. In addition, introducing free PPy led to an enhanced tensile strength of 164.6% and enhanced photothermal effect by 3.25 times, enabling excellent photothermal scratch and fracture healing. Finally, the photothermal desalinator and photothermal power generator were designed and integrated based on the enhanced photothermal PEUs for different application scenarios, demonstrating the excellent ability of photothermal desalination as well as an efficient transformation from light energy to electrical energy and then to mechanical energy.
中文翻译：
通过动态烯胺-脲键设计稳健且可回收的共价弹性体网络
具有新的动态交换化学的超强且可回收的共价弹性体网络的设计仍然是一个挑战。在此，开发了烯胺-脲键（EUB）的新动态交换化学，并将其引入集成非共轭聚氨酯链和共轭聚吡咯（PPy）链的聚（烯胺-脲）（PEU）共价弹性体网络中，从而实现超强机械性能强度和可回收性。通过小分子模型实验验证了EUBs的动态交换化学，并引入了PEUs与EUBs的应力松弛。 PEU表现出优异的拉伸强度（41.41±0.46MPa）、高拉伸性（1482.03±86.48%）以及优异的无催化剂可回收性和可再加工性。此外，引入游离PPy可使拉伸强度提高164.6%，光热效应增强3.25倍，实现优异的光热划痕和断裂愈合。最后，针对不同应用场景，基于增强型光热PEU设计并集成了光热海水淡化器和光热发电机，展示了光热海水淡化的优异能力以及光能到电能再到机械能的高效转换能力。
更新日期：2024-09-04
中文翻译：
通过动态烯胺-脲键设计稳健且可回收的共价弹性体网络
具有新的动态交换化学的超强且可回收的共价弹性体网络的设计仍然是一个挑战。在此，开发了烯胺-脲键（EUB）的新动态交换化学，并将其引入集成非共轭聚氨酯链和共轭聚吡咯（PPy）链的聚（烯胺-脲）（PEU）共价弹性体网络中，从而实现超强机械性能强度和可回收性。通过小分子模型实验验证了EUBs的动态交换化学，并引入了PEUs与EUBs的应力松弛。 PEU表现出优异的拉伸强度（41.41±0.46MPa）、高拉伸性（1482.03±86.48%）以及优异的无催化剂可回收性和可再加工性。此外，引入游离PPy可使拉伸强度提高164.6%，光热效应增强3.25倍，实现优异的光热划痕和断裂愈合。最后，针对不同应用场景，基于增强型光热PEU设计并集成了光热海水淡化器和光热发电机，展示了光热海水淡化的优异能力以及光能到电能再到机械能的高效转换能力。
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