The Synthesis of Poly(ethylene glycol) (PEG) Containing Polymers via Step-Growth Click Coupling Reaction for CO₂Separation

Abstract

The synthesis of step‐growth polymers via a step‐growth click coupling reaction of diazides based on poly(ethylene glycol) (PEG) and dialkynes based on aromatics is reported. The polymers are characterized by proton nuclear magnetic resonance spectroscopy (1H‐NMR), carbon‐13 nuclear magnetic resonance spectroscopy (13C‐NMR), Fourier transform infrared spectroscopy (FT‐IR), gel permeation chromatography (GPC), differential scanning calorimetry (DSC), and thermogravimetric analysis (TGA). Gas transport properties of one polymer are measured by the time lag (constant volume, variable pressure) method. Low gas permeabilities are a consequence of the rather high glass transition temperature. The rather high selectivities in separation of CO2/N2 and CO2/CH4 result from the CO2‐philic groups such as PEG, triazole, and benzoxazine. According to the gas permeation measurements, the membrane is stable in the temperature range from 30 to 90 °C.

A Novel Phase-Changing Nonaqueous Solution for CO2 Capture with High Capacity, Thermostability, and Regeneration Efficiency

“…Thereinto, poly­(ethylene glycol) (PEG) is an environmentally benign solvent with some appealing properties similar to ionic liquids (ILs), such as low toxicities, good chemical and thermal stability, and negligible vapor pressure. − Moreover, PEGs are inexpensive and have lower viscosity than ILs . Some studies indicate that CO 2 also exhibits high solubility in PEGs due to the quadrupole interaction of CO 2 with polar ether oxygens. − Hence, some researchers use PEGs as a cosolvent for ILs to decrease the viscosity of ILs after CO 2 absorption. Hui and Yang reported that ILs of diethylenetriamine hydrobromide ([DETAH]­Br) dissolved in PEG200 have a CO 2 absorption capacity of 1.184 mol/mol [DETAH]Br and a regeneration efficiency of 86.67% after five consecutive cycles.…”

Synthesis of Multi‐Functionalized N–Cl Hydantoin Polyurethane for Chemical Warfare Agent Decomposition with High N–Cl Stability

“…The degree of decyne functionality was calculated by methyl peak (c) at 0.5–0.6 ppm compared with that of HD‐TPU before decyne click reaction (see Table ) . In the case of PEO and PFO multi‐functionalized TPUs, the degree of functionality was calculated by comparing the area of the methylene protons peak next to triazole (a′ and a′′ ) with the methylene protons peak of HD‐TPU at 4.1–4.4 ppm . In addition, it is noteworthy that the degree of functionality of additional moiety can be readily controlled by adjusting experimental condition of click reaction (Table ).…”

Synthesis and Structure of 3,3-Dimethylindoline Squaraine Rotaxanes

“…The synthesis and characterization of compounds M1 , M2 , 3 , 8 , 9 , 10 , and 13 have been reported elsewhere and are not included here.…”

“…Semisquaraine 6 was first hydrolyzed with NaOH using a previously published protocol. 26 The hydrolyzed product (74 mg, 0.230 mmol) was suspended in anhydrous n-butanol (25 mL) and benzene (25 mL) with aniline 3 (24 mg, 0.163 mmol). The reaction was refluxed in an oil bath for 10 h with azeotropic removal of water.…”