A five-membered cyclic carbonate as CO₂-sourced monomer was prepared from ethylene glycol diglycidyl ether (EGDE) with CO₂ by cycloaddition reaction, abbreviated as 5CC-EGDE, at 130 ℃ under 10 bar CO₂ pressure in the presence of quaternary ammonium salt modified amberlyst (D296) for 20 h. The complete conversion and 98.6% selectivity were obtained, respectively. The incorporation of 5CC-EGDE into epoxy resin could reduce the viscosity during preparation process and improve the toughness effectively. It was ascribed to the ring-opening reaction of 5CC-EGDE with curing agent, and hydrogen bonding, formed between urethane groups and other polar groups. Besides, the low crosslinking density and unreacted carbonate groups remaining in epoxy network were beneficial to the movement of molecular chains and dissipation of energy during deformation process. In addition, effects of hydrogen-bonding interactions and crosslinking density on mechanical performances were also investigated by varying EGDE conversion and amount of added curing agent, respectively. The results indicated that mechanical performances of epoxy resin were promoted by combined effects of urethane linkage, hydrogen bonding, low crosslinking density and unreacted carbonate groups.

乙二醇二缩水甘油醚（EGDE）与CO ₂通过环氧加成反应（缩写为5CC-EGDE）在130℃和10 bar CO ₂下制备了一种五元环状碳酸酯来源的CO ₂单体。在季铵盐改性琥珀（D296）的存在下保持20 h。分别获得了完全转化率和98.6％的选择性。在环氧树脂中加入5CC-EGDE可以降低制备过程中的粘度并有效地提高韧性。这归因于5CC-EGDE与固化剂的开环反应以及在氨基甲酸酯基团与其他极性基团之间形成的氢键。此外，低交联密度和未反应的碳酸酯基团残留在环氧网络中，有利于变形过程中分子链的移动和能量的耗散。此外，还通过改变EGDE转化率和固化剂的添加量研究了氢键相互作用和交联密度对机械性能的影响，分别。结果表明，氨基甲酸酯键，氢键，低交联密度和未反应的碳酸酯基团共同作用，可提高环氧树脂的机械性能。