【Macromolecular Rapid Communications】Catalyst-free Vitrimer Cross-linked By Biomass-derived Compounds with Mechanical Robustness, Reprocessability and Multi-shape Memory Effects
作者：Lingyun Huang,Yinxin Yang,Zhen Niu,Ruiyao Wu,Weifeng Fan,Quanquan Dai,Jianyun He,Chenxi Bai
關鍵字：1
論文來源：期刊
發(fā)表時間：2021年
Vitrimerization of thermoset polymers plays an important role in addressing resource recovery and reuse. Vitrimer elastomers with good mechanical properties often require well-designed crosslinking agents or fillers, but this increases processing complexity or reduces vitrimer dynamic properties. In this report, we design a simple green strategy to build a strong vitrimer elastomer. Commercially available epoxidized natural rubber (ENR) is cross-linked with biomass-derived D-Fructose 1,6-bisphosphoric acid (DF) to get a vitrimer elastomer cross-linked by β-hydroxy phosphate ester bonds and has abundant hydrogen bonds. Hydrogen bonds can preferentially break and dissipate energy under external forces, which makes the sample robust. The topological network can be reformed at high temperatures through the dynamic exchange of β-hydroxy phosphate ester bonds, which gives the material malleability and recyclability. In addition, through the strategy of combining reprocessing and welding, multiple shape memory effects can be achieved in one post-processing step. Considering that a variety of commercially available epoxy polymers are easily available, we believe that this strategy can be a simple and versatile way to enable commercial epoxy polymers to achieve green crosslinking through biomass crosslink agents, which results in robust and recyclable vitrimers based on β-hydroxy phosphate bonds.