N n dimethylformamide dmf ethanol

The thermoplastic polyurethane (TPU) MM5520 (pellets) used for electrospinning was purchased from SMP Technologies Inc. (Tokyo, Japan), with a nominal glass transition temperature (T_g) of 55 °C. As reported in [25 (link)], after being immersed in water or ethanol, the T_g of this TPU can be lowered by 30 °C, due to the plasticizing effect of the absorbed bound water or ethanol on the hydrogen bonding [26 (link)]. Hence, the SME of this TPU can be activated either by heating to above its T_g or by wetting in ethanol.
N,N-dimethylformamide (DMF), ethanol, and acetone were purchased from Sinopharm Chemical Reagent Co., Ltd. (Shanghai, China). DMF was mixed with acetone in a volumetric ratio of 1:1. After that, TPU pellets were added into it for different concentrations varying from 10 wt % to 25 wt %. Subsequently, magnetic stirring was applied at room temperature (≈25 °C) for 24 h.

Cr(NO₃)₃·9H₂O, p-phthalic acid (BDC), CaCl₂, hydrofluoric acid (HF), SA (200 ± 20 mPa·s), and TEPA were purchased from Aladdin Chemical Reagent Co., Ltd. (Shanghai, China). Pb(NO₃)₂, N,N-dimethylformamide (DMF), ethanol, and acetic acid were of analytical reagent grade and purchased from Sinopharm Chemical Reagent Co., Ltd. (Beijing, China).

2-aminoterephthalic acid (ATA, 98%), tetracycline (TET, ≥98%), doxycycline (DOX, ≥98%), oxytetracycline (OTC, ≥98%), chlortetracycline (CTC, ≥98%), chloramphenicol (CAP, 98%), tyrosine (Tyr), histidine (His), serine (Ser), phenylalanine (Phe), arginine (Arg) and cysteine (Cys) were provided by Shanghai Macklin Biochemical Co., Ltd. (Shanghai, China). Zirconium chloride (ZrCl₄, 99%) was purchased from Beijing Yinuokai Technology Co., Ltd. (Beijing, China). Methacrylic acid (MAA, 99%), 2,2-azobisisobutyronitrile (AIBN, 99%) and ethylene glycol dimethacrylate (EGDMA, 98%) were obtained from TCI Development Co., Ltd. (Shanghai, China). N, N-dimethylformamide (DMF), ethanol, glucose, sucrose, MnCl₂·4H₂O, MgCl₂·6H₂O, Zn(NO₃)₂·6H₂O, CaCl₂, NaCl and KCl were supplied by Sinopharm Chemical Reagent Co., Ltd. (Shanghai, China). All reagents and chemicals used in this work were of at least analytical grade. The apparatuses utilized in this study are described in detail in the supporting information.