Acetic Acid → Divinylbenzene-styrene

Participants

Reaction Conditions

Reaction Steps

A styrene-divinylbenzene fine particle product was prepared by polymerization of 30 g. of styrene and 3 g. of 55% divinylbenzene in 250 ml. of hexane using 4.83 ml. of 1.18 N S-butyllithium as catalyst and 1.5 g. of the styrene-isoprene block copolymer dispersant of Example 4 under nitrogen. After 1.5 hours reflux the mixture was cooled to 20°C. and reacted with air followed by 0.36 ml. of acetic acid to convert the terminal lithium groups to hydroperoxide groups. The resulting mixture was then mixed with a solution of dimethyl silicone rubber dissolved in hexane (Gen. Elec. SE-76) and the mixture precipitated into methanol to give a masterbatch product containing 50 parts of filler per 100 parts of silicone rubber.

Provenance & Evidence