Benzoyl Peroxide → Styrene

Participants

Reaction Conditions

Reaction Steps

An interpolymer of 50 parts of styrene, 25 parts of maleic anhydride, 25 parts of diisobutylene and 15 parts of a styrene-butadiene (25:75) rubber was prepared in accordance with the present invention in the following manner. A polymerization reactor was charged with 50 parts of styrene, 15 parts of a 25:75 parts by weight copolymer of styrene:butadiene rubber and 75 parts of methyl ethyl ketone. The reactor contents were stirred under a nitrogen atmosphere and brought to 82° C., at which point this temperature and stirring were maintained, and a continuous feed of 25 parts of maleic anhydride, 25 parts of diisobutylene and 0.3 part of benzoyl peroxide in 25 parts of methyl ethyl ketone was added uniformly to the polymerization mixture over a period of 6 hours. The contents of the reactor were coagulated with the addition of methanol while stirring and the solid polymer was dried at reduced pressure to constant weight. The resulting polymer was found to have the following properties: ASTM heat-distortion temperature 157° C., flexural strength 7.32 × 103 psi, tensile strength 5.89 × 103 psi, and notched Izod impact strength 0.84 foot pounds per inch of notch.

Provenance & Evidence