Firstly,prepare the water solutions of given concentrations of acrylamide,pentaerythritol and ammonium cerium nitrate respectively. Add 50 ml of AM solution and a given volume of pentaerythritol solution to a reaction flask which is sealed after sufficient deoxigenation.Then add a given amount of ammonium cerium nitrate solution by injection,and mix it well by shaking the flask.Then put the flask in a thermostatic bath of a given temperature. After a given reaction duration,precipitate the mixture with a given amount of acetone.After being shredded michanically,the precipitate is immersed in acetone for 24h,and dried under room temperature ,and then distilled with acetone for a few hours in a column equipped with a reflux condenser to remove the monomer.Finally,the precipitate is dried to constant weight at 25 C in a vacuum oven.
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