Azobisisobutyronitrile → p-Tert-butoxystyrene styrene

Participants

Reaction Steps

p-tert-Butoxystyrene (100 g), 19.7 g of styrene, 8.1 g of azobisisobutyronitrile and 2.5 g of tert-dodecylmercaptane were dissolved in 180 g of propylene glycol monomethyl ether, and the polymerization reaction was performed at 80° C. for 9 hours. The polymerization solution was purified by reprecipitation with methanol to obtain 100 g of a p-tert-butoxy styrene/styrene copolymer (Mw: 72,00, Mw/Mn: 1.80). Subsequently, this copolymer and 50 g of 10 mass % aqueous sulfuric acid were dissolved in 300 g of propylene glycol monomethyl ether, and the hydrolysis reaction was performed at 90° C. for 6 hours. The reaction solution was purified by reprecipitation with a large amount of water until the solution became neutral, whereby Resin (B-3) which is a p-hydroxystyrene/styrene (=75/25 mol %) copolymer was obtained. The weight average molecular weight of this resin was 5,200.

Provenance & Evidence