Method of preparing branched polyacrylate (methacrylate) polymer through emulsion polymerization
An acrylate and emulsion polymerization technology, which is applied in the field of emulsion polymerization synthesis of branched poly(meth)acrylates, can solve problems such as limiting the development of branched poly(meth)acrylates, achieve low environmental impact, high conversion rate, and simple operation easy effect
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Embodiment 1
[0022] A mixed solution of methyl methacrylate (MMA, 20.0042 g, 0.2 mol) and 3-mercaptohexyl methacrylate (0.2010 g, 1 mmol) was added to a solution of sodium dodecylbenzenesulfonate (1.0072 g, 5 wt % MMA), sodium bicarbonate (0.6010 g, 3 wt % MMA), potassium persulfate (0.2714 g, 1 mmol) and water (80.0102 g, 20% solid content) in the reaction flask, vacuum the oxygen After that, the reaction was stirred at 80° C. for 2 hours, and the conversion rate of MMA was measured to be 97.8%. The product was demulsified with sodium chloride, washed with water three times, and dried to obtain a polymer. The polymer was analyzed by three-detection gel permeation chromatography, and the results were as follows: light scattering weight average molecular weight M w.MALLS = 3042000, molecular weight distribution PDI = 5.27, Mark-Houwink index α = 0.424, branching factor g '=0.23, confirming that the obtained polymer has a branched structure. figure 1 It is the intrinsic viscosity of bra...
Embodiment 2
[0024] A mixed solution of MMA (20.0008 g, 0.2 mol) and 3-mercaptohexyl methacrylate (0.8061 g, 4 mmol) was added to a solution of sodium dodecylbenzenesulfonate (1.0013 g, 5 wt % MMA), Sodium bicarbonate (0.6002 g, 3 wt % MMA), potassium persulfate (0.2719 g, 1 mmol) and water (80.0032 g, 20% solid content) in a reaction flask, after vacuuming and exhausting oxygen, at 70 °C The reaction was stirred for 5 hours, and the conversion rate of MMA was measured to be 98.4%. The product was demulsified with sodium chloride, washed with water three times, and dried to obtain a polymer. The polymer was analyzed by three-detection gel permeation chromatography, and the results were as follows: light scattering weight average molecular weight M w.MALLS = 2909000, molecular weight distribution PDI = 5.96, Mark-Houwink index α = 0.462, branching factor g '=0.189, confirming that the obtained polymer has a branched structure. figure 1 It is the intrinsic viscosity of the branched poly...
Embodiment 3
[0026]A mixed solution of MMA (20.0011 g, 0.2 mol) and 3-mercaptohexyl methacrylate (0.8066 g, 4 mmol) was added to a solution of sodium dodecylbenzenesulfonate (1.0031 g, 5 wt % MMA), Sodium bicarbonate (0.6259 g, 3 wt % MMA), potassium persulfate (1.0808 g, 4 mmol) and water (30.0032 g, 40% solid content) in a reaction flask, after vacuuming and exhausting oxygen, at 70 °C The reaction was stirred for 5 hours, and the conversion rate of MMA was measured to be 96.1%. The product was demulsified with sodium chloride, washed with water three times, and dried to obtain a polymer. The polymer was analyzed by three-detection gel permeation chromatography, and the results were as follows: light scattering weight average molecular weight M w.MALLS = 1218000, molecular weight distribution PDI = 5.21, Mark-Houwink index α = 0.465, branching factor g '=0.238, confirming that the obtained polymer has a branched structure. figure 2 The branching factor of embodiment 3 gained branche...
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