Methanol → p-Tert-butoxystyrene p-methylstyrene

Beteiligte Stoffe

Reaktionsschritte

To a solution of 100 g (0.567 mol) of p-tert-butoxystyrene and 3.54 g (0.03 mol) of p-methylstyrene in 300 ml of 1,4-dioxane was added a catalytic amount of 2,2'-azobis(methyl 2-methylpropionate) to carry out reaction in a nitrogen stream at 80° for 6 hours. The reaction solution was cooled and poured into 5,000 ml of a methanol solution to cause crystallization. Precipitated crystals were filtered out, washed with methanol and dried in vacuo to give 92.3 g of poly-(p-tert-butoxystyrene/p-methylstyrene)as white powder. The polymer was found to have p-tert-butoxystyrene unit and p-methylstyrene unit in a molar ratio of ca. 95:5 based on 1H NMR. The weight-average molecular weight (Mw) was determined to be about 20,000 by GPC with polystyrene calibration.

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