Anionic polymerization of secondary aminostyrene and characterization of the polymer

摘要

The characteristics of poly-(secondary aminostyrene) having narrow molecular weight distribution were investigated. N-isopropyl-N-trimethylsilyl-4-vinylbenzylamine (SBA) was purified using sec-butylmagnesium bromide as a purging reagent under high vacuum. SBA was anionically polymerized with n-butyllithium or cumylpotassium in tetrahydrofuran at -78 °C under high vacuum to yield the corresponding polymer PSBA in 100% yield. Subsequent deprotection of the trimethylsilyl group from PSBA produced poly(N-isopropyl-4-vinylbenzylamine) of the desired molecular weights (Mn: 1.3×104-17×104, determined by membrane osmometry) with narrow molecular weight distribution (Mw/Mn: 1.07-1.03, determined by gel permeation chromatography).