期刊
GREEN CHEMISTRY
卷 24, 期 4, 页码 1561-1569出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/d1gc04441a
关键词
-
资金
- National Natural Science Foundation of China [NSFC22172155]
- Youth Innovation Promotion Association CAS [2016206]
In this study, mechanically robust poly(urea-imine) (PUI) thermosets were synthesized from renewable CO2, and demonstrated satisfactory mechanical performance, seal-healing and recyclable properties. The incorporation of cross-linked dynamic imine bonds and reversible hydrogen bonds allowed the adjustment of properties.
The synthesis of self-healing and recyclable polymeric materials from renewable CO2 is of great importance in the fields of functional materials and sustainable chemistry. In this work, mechanically robust poly(urea-imine) (PUI) thermosets were prepared from CO2-sourced oligourea (OUa), terephthalaldehyde (TA) and tri(2-aminoethyl)amine (TAEA) through condensation between equimolar amino and aldehyde groups. The synthesized PUIs have satisfactory mechanical performance, seal-healing and recyclable properties as they contain cross-linked dynamic imine bonds and reversible hydrogen bonds. These properties can be adjusted by changing the ratio of TAEA to OUa, thus varying the chemical bonds and chain structure. The highest values for the mechanical properties tensile stress (10.2 MPa) and Young's modulus (79 MPa) were obtained in a PUI thermoset synthesized from a molar ratio of TAEA to OUa of 3 : 2 (OUa(2)-T-3). In addition, this thermoset can be healed at 80 degrees C with a healing efficiency over 92% owing to the high reversibility of imine and hydrogen bonds and the flexibility of CO2-sourced OUa chains. Moreover, it can also be reprocessed and recycled by physical and/or chemical means without change in its chemical structure, glass transition temperature and original mechanical properties. Additionally, this PUI thermoset can be easily degraded into its original reagents OUa, TA and TAEA under acid conditions. Therefore, as novel sustainable materials, the PUI thermosets reported in this article have great potential to replace conventional non-degradable thermosets over a wide field.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据