Deuterated chloroform

Dimethyl 5-aminoisophthalate, 1,3,5-tris (bromomethyl) benzene, phenol, sodium acetate anhydrous, sodium nitrite, sodium hydroxide, N,N-dimethylformamide (DMF), ethanol anhydrous, methanol, magnesium sulfate anhydrous, potassium carbonate, sodium chloride, acetonitrile, tetrahydrofuran, hydrochloric acid, sulphuric acid, pH 4.0 phosphate buffer (0.2 M), pH 7.0 phosphate buffer (0.2 M), pH 8.0 phosphate buffer (0.2 M), pH 9.0 phosphate buffer (0.2 M), sodium dihydrogen phosphate anhydrous, sodium phosphate dibasic, potassium bromide, deuterated chloroform, octadecylsilane chemically bonded silica (C₁₈) were purchased from Shanghai Macklin Biochemical Co., Ltd (Shanghai, China) and were of analytical grade. pH 6.0 phosphate buffer (0.2 M) was purchased from Beijing Lanyi chemical products Co., Ltd. (Beijing, China) and were of analytical grade. Quinine sulfate fluorescent standard substance (98.6%) and abamectin B₁ were purchased from Aladdin Biochemical Technology Co., Ltd. (Shanghai, China). Demonized water (18 MΩ cm) was produced by using a water purification system (Water Purification System, Casccada 1, Pall, Beijing, China).

Alkali lignin (AL, solid content of 96.05%, lignin of 93.16%, ash of 3.41%, other substances of 3.43%, sulfur content of 0) with high hydroxyl contents (4.2 mmol/g) was provided by Shandong Xinglong Paper (Group) Co., Ltd. Granular urea (GU, 3–5 mm in diameter and 46.4% N) was purchased from China National Offshore Petrochemical Co., Ltd. Anhydrous pyridine, Deuterated chloroform (99.8%), Hexamethylene diisocyanate (HDI, 99%, wt%), tin 2-ethylhexanoate (95%, wt%) and triethylene tetramine (65%, wt%) were analytical grade and purchased from the Shanghai Macklin Biochemical Co., Ltd. Poly(ε-capro-lactone) diol (PCLD, average M_n ~ 530, hydroxyl value 200 mg KOH/g) was supplied from Shanghai Xushuo Biological Technology Co., Ltd. Epoxy resin-44 (E-44) was also purchased from Nantong Xingchen Synthetic Material Co., Ltd.