Styrene → Benzene, ethenyl-, polymer with 1,3-butadiene

Participants

Reaction Steps

A "living" medium vinyl butadiene/styrene copolymer was prepared in accordance with the following procedure: To a stainless steel 5 gallon reactor equipped with a stirrer and thermometer and maintained under a nitrogen atmosphere was charged 309 grams (2.97 moles) of styrene, 1235 grams (22.87 moles) of 1,3-butadiene, 25.4 lbs of hexane, 8.2 millimoles (hereinafter abbreviated as mM) of N,N,N',N'-tetramethylethylene diamine (TMEDA) and 11.86 mM of n-butyllithium initiator. After addition of the ingredients was completed, the temperature of the reaction mixture was controlled at 30°-50° C. for 4.5hours with stirring under positive nitrogen pressure. A sample of the resultant living polymer was quenched with isopropanol and drum dried to serve as a control (designated C1 for convenience). For comparative purposes, a sample of living copolymer was terminated with benzonitrile to serve as an additional control (designated C2 for convenience).

Provenance & Evidence