Dibutyltin dilaurate

Polycarbonate diol (PCDL, purity > 95%, M_n ~ 1000) was procured from Shanghai Huihua Industrial Co., Ltd., Shanghai, China. Isophorone diisocyanate (IPDI, purity > 99.5%, NCO% ≥ 37.5%) was supplied by Bayer Chemicals (Leverkusen, Germany). Dodecafluoroheptyl methacrylate was purchased from Shangfu Technology Co., Ltd., Shanghai, China. N-methyldiethanolamine (MDEA, ≥99.5%), 1,4-butanediol (BDO, ≥99.5%), methyl methacrylate (MMA, ≥99.5%), hydroxyethyl methacrylate (HEMA, ≥96%), trimethylolpropane (TMP, ≥99.5%), and dibutyltin dilaurate (DBTDL, ≥99.5%) were purchased from Macklin Inc., Shanghai, China. Dihydrazide adipate (ADH, ≥98%) and 2,6-tert-butyl-p-cresol (BHT, ≥99.5%) was supplied by Aladdin Reagent Co., Ltd., Shanghai, China. Glacial acetic acid (HAc, ≥90%) and ammonium persulfate (APS, ≥99%) were purchased from Shanghai Lingfeng Chemical Reagent Co., Ltd., Shanghai, China. Deionization is homemade in the laboratory. All the other reagents underwent further purification.

Poplar wood (Populus spp.) was cut into blocks with the dimensions of 10 mm (longitudinal) × 20 mm (tangential) × 20 mm (radial). All wood blocks were ultrasonically cleaned with an ethanol/water mixture, and dried in an oven at 100 °C for 24 h until a constant weight was reached. 2-Isocyanatoethyl methacrylate (IEMA, 98%), divinylbenzene (DVB, 80%), 2,2′-azobis(2-methyl propionitrile) (AIBN, 98%), and dibutyltin dilaurate (DBTL, 95%) were purchased from Macklin Biochemical Co., Ltd (Shanghai, China). Ethyl acetate (99%), dimethylsulfoxide (DMSO, 99.8%), hydrochloric acid (HCl, 36–38%), sodium hydroxide (NaOH, 96%), sodium chloride (NaCl, 99.5%), toluene (99.5%), acetone (99.5%), n,n-dimethylformamide (DMF, 99.5%), decane (98%), 1,4-dioxane (99%), absolute ethanol were purchased from Sinopharm Chemical Reagent Co., Ltd (Shanghai, China).