Critical transition of epoxy resin from brittleness to toughness by incorporating CO2-sourced cyclic carbonate
| Autor: | Xiaoyun Li, Jiexi Ke, Yuhua Zhao, Qifeng Li, Maoqing Kang, Junwei Wang, Shuai Jiang |
|---|---|
| Rok vydání: | 2018 |
| Předmět: |
chemistry.chemical_classification
Toughness Materials science Hydrogen bond Process Chemistry and Technology Salt (chemistry) 02 engineering and technology Epoxy 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences 0104 chemical sciences chemistry.chemical_compound Monomer chemistry Chemical engineering visual_art visual_art.visual_art_medium Chemical Engineering (miscellaneous) Carbonate 0210 nano-technology Ion-exchange resin Selectivity Waste Management and Disposal |
| Zdroj: | Journal of CO2 Utilization. 26:302-313 |
| ISSN: | 2212-9820 |
| DOI: | 10.1016/j.jcou.2018.05.020 |
| Popis: | 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. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
Full Text from ScienceDirect