N,N,N',N'-Tetramethylethylenediamine → Benzene, ethenyl-, polymer with 1,3-butadiene

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Reaction Steps

The procedure described in Example 1 was utilized in this example except that 1 mL of 1 M solution of sodium alkoxide (NaOR), i.e., sodium mentholate, in hexanes and 1 mL of 1 M solution of N,N,N′,N′-tetramethylethylene diamine (TMEDA) in hexanes were added to the catalyst system (BaTHFA/MgR2) making the molar ratio (BaTHFA/MgR2/NaOR/TMEDA) 1:3:1:1. The styrene-butadiene produced was determined to have a glass transition temperature (Tg) at −77° C. and a melting temperature (Tm) at +8° C. The Mooney viscosity (ML-4) at 100° C. was 89. The GPC measurements indicated that the polymer has a number average molecular weight (Mn) of 284,600 g/mol and a weight average molecular weight (Mw) of 350,800 g/mol. The polydispersity (Mw/Mn) of the resulting polymer was 1.23. Carbon-13 NMR analysis showed a trans 1,4 polybutadiene content of 74.20%, cis 1,4 polybutadiene content of 19.80%, a 1,2 polybutadiene content of 6%, and a polystyrene content of 18%.

Provenance & Evidence