Ultrastrong, High Fire Resistance, Repairable, and Recyclable Fluorinated Biobased Polyimine Networks
Jue Wang, Hongliang Ding, Ping Yu, Zichen Jia, Chuanshen Wang, Haiyue Wang, Hongfei He, Weiyi Xing, Wei Yang, Ping Zhang, Bin Yu
Abstract
Traditional commercial thermosetting materials are currently facing significant challenges in terms of reprocessing, degradation, and recycling because of a large demand of petroleum resources, leading to a significant environmental burden. In our work, a trialdehyde monomer synthesized by a renewable resource reacted with 1,4-Bis(4-amino-2-trifluoromethylphenoxy)benzene and 1,4-Bis(4-aminophenoxy)benzene to form a dynamic cross-linked network called BQPs. The fluorinated biobased polyimine material exhibits exceptional mechanical properties with a tensile strength of 96.2 MPa, which is much higher than commercial plastics such as polycarbonate (∼65 MPa). Moreover, it demonstrates excellent flame retardancy by achieving a level of V0 rating in the UL-94 test and a value of 50% in the limiting oxygen index test. Additionally, it can be easily reprocessed within 10 min at high temperature (160 °C) and rapidly repaired with a solvent. Overall, this high-performance fluorinated biobased polyimine product will significantly contribute to expanding the development of polyimine materials.