Production method and application of micron-sized supported difunctional polymer brush with nitroxide free radicals and sulfonic groups
A technology of nitroxide free radicals and polymer brushes, which is applied in the preparation of polycarboxylate superplasticizer active macromonomers, bifunctional polymer brushes, and synthesis of polyethylene glycol monomethyl ether acrylate, which can solve the problem of nitrogen oxides Free radicals have no effect of polymerization inhibition, there is no recovery of polymerization inhibitors and acid catalysts, and poor dispersibility, etc., to achieve the effects of easy recycling, large particle size, and improved compatibility
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Embodiment 1
[0027] 1. Preparation of micron-sized bifunctional polymer brushes containing nitroxide radicals and sulfonic acid groups
[0028] (1) Add CuBr to a 100mL three-neck flask 2 (0.0250 g, 0.112 mmol), solvent anisole (30 mL) and magnetic rotor, ultrasonic vibration 2After complete dissolution, add a condenser tube and a thermometer to the three-necked flask, and set the temperature to 40°C. Under nitrogen atmosphere, St (11.6648 g, 112 mmol), PMDETA (0.23 mL, 1.12 mmol), PS-Cl (1 g, 1.12 mmol) and stannous octoate ( 0.36 mL, 1.12 mmol). The reaction temperature was set to 110 °C and reacted for 9 h. After the reaction was completed, the reaction solution was poured into a beaker. Let stand for 12 h, remove the supernatant by filtration, and dry in vacuum until constant weight. The resulting product is the homopolymer brush PS-PSt.
[0029] (2) Add CuBr to a 100 mL three-neck flask 2 (0.0098 g, 0.04 mmol), solvent anisole (30 mL) and magnetic rotor, ultrasonic vibration 2...
Embodiment 2
[0037] 1. Preparation of micron-sized double-tapping functional polymer brushes containing nitroxide radicals and sulfonic acid groups
[0038] (1) Add the catalyst CuBr into a 100 mL three-necked flask 2 (0.0250 g, 0.112 mmol), solvent anisole (30mL) and magnetic rotor, ultrasonic vibration 2 After complete dissolution, add a condenser tube and a thermometer to the three-necked flask, and set the temperature to 40°C. Under nitrogen atmosphere, the monomer St (23.3296 g, 224 mmol), the ligand PMDETA (0.23 mL, 1.12 mmol), and the macroinitiator polystyrene chloride ball PS-Cl (1 g, 1.12 mmol) and reducing agent stannous octoate (0.36 mL, 1.12 mmol). The reaction temperature was set to 110 °C and reacted for 9 h. After the reaction was completed, the reaction solution was poured into a beaker, allowed to stand for 12 h, filtered to remove the supernatant, and vacuum-dried to constant weight. The resulting product is the homopolymer brush PS-PSt.
[0039] (2) Add the cataly...
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