Dimethylformamide dmf

Pyrrole (reagent grade, 98.0%), polyacrylonitrile (PAN, M_w of ca. 150,000), polyvinylpyrrolidone (PVP, M_w of ca. 1,100,000), poly(vinylidene fluoride) (PVDF, M_w of ca. 500,000), poly(vinyl alcohol) (PVA, M_w of ca. 90,000), and 1-Methyl-2-pyrrolidinone (NMP, 99.0%) were obtained from Sigma-Aldrich Co. (Burlington, MA, USA). Sodium sulfate (Na₂SO₄, 98.5%) and dimethylformamide (DMF, 99.0%) were acquired from Samchun Chemical Company (Seoul, Republic of Korea). Iron(III) chloride hexahydrate (FeCl₃·6H₂O, 99.0%) and tin chloride pentahydrate (SnCl₄·5H₂O, 98.0%) were obtained from the Junsei Chemical Co. (Tokyo, Japan). Carbon black was purchased from Thermo Fisher Scientific (Waltham, MA, USA). All chemicals were used as received without any further reaction or treatment.

Eugenol (99%), 3-chloroperoxybenzoic (m-CPBA, <77%), 1-methylimidazole (99%), zinc acetate (99.9%), 1,5,7-triazabicyclo[4,4,0]dec-5-ene (TBD, 98%), and dibutyltin dilaurate (DBTDL, 99%) were purchased from Sigma-Aldrich Chemical (Yongin City, South Korea). Ester-type TPU (Neothane 5285 AP) was obtained from Dong Sung Corporation (Busan, South Korea), and ether-type TPU (Desmopan 9395AU) was purchased from Covestro Deutschland AG (Leverkusen, Germany). Average molecular weights of TPUs determined by Gel Permeation Chromatography (GPC) are given in Table S1. Sodium thiosulfate (Na₂S₂O₃, 98%), sodium bicarbonate (NaHCO₃, 99%), sodium chloride (NaCl, 99%), and anhydrous sodium sulfate (Na₂SO₄, 99%) were purchased from Aldrich Chemical (Yongin City, South Korea). The solvents used in this work, including dichloromethane (CH₂Cl₂, 99%) and dimethylformamide (DMF, 99%), were supplied by Samchun Pure Chemical (Pyeongtaek-si, South Korea). All materials were used without further purification. The typical structures of TPUs are shown in Scheme 1.