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Oxidative chemical depolymerization of thermoset epoxy resin for green recycling
김두헌,유아영,고문주 한국공업화학회 2021 Journal of Industrial and Engineering Chemistry Vol.96 No.-
Carbon-fibre-reinforced plastics (CFRPs) have been widely used in manyfields, which has inevitablyresulted in the production of large amounts of waste composites. Therefore, the recycling of high-valuecarbonfibres has become a topic of great interest. Thus, herein we report the development of a methodfor the decomposition of the cross-linked epoxy (EP) resin of CFRPs by oxidative depolymerization underambient pressure in the presence of a potassium permanganate (KMnO4) solution. The decompositionmechanism was also examined, and the reaction rate constant was determined to be 2.4510 2 min 1 ina 1 M KMnO4 solution. In addition, the tensile strength of the reclaimed CF was 3.20 GPa, which is 90.65%the value of the virgin CF. These results indicate that our developed method is suitable for the efficientreclamation of high-quality carbonfibres from CFRP scrap.
Design and synthesis of the quinacridone-based donor polymers for application to organic solar cells
김두헌,전성재,한용운,김영훈,양남규,이형석,문두경 한국공업화학회 2021 Journal of Industrial and Engineering Chemistry Vol.101 No.-
D–p–A type quinacridone-based polymers were designed with different acceptor moieties and successfullysynthesized via a Suzuki coupling reaction. Depending on the introduction of benzothiadiazole andquinoxaline moieties, the synthesized polymers, poly(quinacridone-thienothiphene-benzothiadiazole)(PQCfTB) and poly(quinacridone-thienothiphene-quinoxaline) (PQCfTQx), showed different physical,optical and electrochemical properties. PQCfTB had a more extended p-conjugation length and a highernumber average molecular weight (Mn, 365.1 kDa) than that of PQCfTQx (167.5 kDa). Furthermore, eachpolymer showed different optical behavior and optical band gaps (Egopt: 1.91 eV for PQCfTB; 1.87 eV forPQCfTQx) in the film state. The highest occupied molecular orbital (HOMO) and lowest unoccupiedmolecular orbital (LUMO) levels of PQCfTB and PQCfTQx were calculated as 5.20 eV and 5.22 eV, aswell as 3.29 eV and 3.35 eV, respectively. The XRD measurement results showed that the polymersfor PQCfTB and PQCfTQx had bimodal and face-on structures, respectively. Finally, organic solar cellsfor both polymers were fabricated and optimized with respect to the acceptor. In summary, thePQCfTB-based devices showed higher power conversion efficiencies (w/PC71BM 3.9%; w/IT-M 5.2%;w/PM6:Y6-BO-4Cl 11.0%) than PQcfTQx (2.3%, 4.7%, and 10.0%).