Methacrylic Acid → HCID 88159785, compound

Participants

Reaction Conditions

Reaction Steps

Poly(MMA/MAA/EGDMa) microgel (Microgel 2A) was prepared using seed-feed emulsion polymerisation. A seed monomer mixture containing Methyl methacrylate (MMA) (Aldrich, 139.3 g), Methacrylic acid (MAA) (Aldrich, 60.1 g) and Ethyleneglycol dimethacrylate (EGDMa) (Aldrich, 2.1 g) was prepared and 25.2 g (8.8% of total monomer) of the mixture added to a pre-purged (N2), stirred, solution of sodium dodecylsulphate (BDH, 1.75 g in 500 g of water), which had been heated to 80° C. K2HPO4 (2.55 g of 7% w/w solution in water) and ammonium persulphate (4.50 g of 3% w/w solution in water) were immediately added whilst maintaining a nitrogen atmosphere. A feed monomer mixture containing MMA (273.1 g), MAA (134.0 g) and EGDMa (1.7 g) was prepared. After the appearance of a slight blue turbidity, 264 g (91.2% of total monomer) of the feed monomer mixture was added at a constant rate over a 90 min period. Additional ammonium persulphate (2.73 g of 3% solution in water) was added and the temperature maintained for a further 2 h. The microgel was extensively dialysed against Milli-Q quality water. The average particle size of the particles in the collapsed state was about 100 nm. The swollen state diameter was about 260 nm at pH=7.4

Provenance & Evidence