AMPS was dissolved in a certain amount of water, the solution pH was adjusted to 7-8 by NaOH, then AMPS solution, AM and NvP were poured into four flasks and filled with N2 protection. The water bath was heated to the reaction temperature. After constant temperature, a certain amount of initiator was added, and the viscous product AMPS/AM/NVP terpolymer was obtained by stirring for about 4 hours. The bottle number was to be used.
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