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(Macromolecules) Robust, Fire-Safe, Monomer-Recovery, Highly Malleable Thermosets from Renewable Bioresources
作者:Sheng Wang, Songqi Ma,* Qiong Li, Wangchao Yuan, Binbo Wang, Jin Zhu*
關鍵字:malleable thermosets, Schiff base, recycle, vanillin
論文來源:期刊
具體來源:Macromolecules
發表時間:2018年

Conventional thermosets are built by nonrenewable fossil resources, and are arduous to be reprocessed, recycled, and reshaped due to their permanent covalent cross-linking, and their flammability makes them unsafe during use. Here, for the first time, we synthesized a novel Schiff base precursor from abundant and renewable lignin derivative vanillin and produced malleable thermosets (Schiff base covalent adaptable networks (CANs)) combining high performance, super-rapid reprocessability, excellent monomer-recovery and arbitrary permanent shape changeability as well as outstanding fire resistance. The Schiff base CANs exhibited high glass transition temperatures of ~178 °C, tensile strength of ~69 MPa, and tensile modulus of ~1925 MPa, and excellent flame retardancy with UL-94 V0 rating and V1 rating and high LOI of ~30 %. Meanwhile, three Schiff base CANs showed high malleability with the activation energy of the bond exchange of 49~81 kJ mol-1 and could be reprocessed in 2~10 min at 180 °C. These Schiff base CANs provide a prime example to foster the development of advanced thermosetting materials from renewable bioresources.



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