The polymer was prepared by copolymerizing vinyl sulfonate, methyl methacrylate(MMA) and methacrylicacid(MAA) in different proportions.
三元树脂由乙烯基磺酸酯、甲基丙烯酸甲酯（MMA）与甲基丙烯酸（MAA）按不同的配比共聚而成。
2
Methods:Silica gel tube adsorption and solvent desorption were used for sampling of methacrylicacid and analysis was performed by HPLC.
方法：以硅胶管采集空气中甲基丙烯酸，用甲醇解吸后高效液相色谱测定。
3
The present invention, thereby, provides a novel heteropoly acid catalyst having excellent methacrolein conversion rate, methacrylicacid selectivity and yield.