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Anionic synthesis of ω‐dimethylamino‐functionalized polymers by functionalization of polymeric organolithiums with 3‐dimethylaminopropyl chloride
Author(s) -
Quirk Roderic P.,
Han Kwansoo,
Lee Youngjoon
Publication year - 1999
Publication title -
polymer international
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.592
H-Index - 105
eISSN - 1097-0126
pISSN - 0959-8103
DOI - 10.1002/(sici)1097-0126(199902)48:2<99::aid-pi101>3.0.co;2-u
Subject(s) - surface modification , polymer , chemistry , chemical modification , benzene , chloride , polymer chemistry , lewis acids and bases , polymerization , titration , inverse gas chromatography , organic chemistry , catalysis
The functionalization reactions of polystyryllithium, polyisoprenyllithium and polybutadienyllithium in benzene with 3‐dimethylaminopropyl chloride have been investigated in detail. The effects of addition mode (normal and inverse addition), added Lewis bases (THF and TMEDA), temperature and concentration have been investigated. The polymer products were analysed by SEC, 1 H and 13 C NMR spectroscopy and end‐group titration. The pure ω‐dimethylamino‐functionalized polymers were quantitatively isolated by silica gel column chromatography. The functionalizations of polystyryllithium, polyisoprenyllithium and polybutadienyllithium by normal addition in benzene produce the corresponding ω‐dimethylamino‐functionalized polymers in isolated yields of 67%, 85% and 90%, respectively. Functionalization efficiencies were improved by using the inverse addition procedure and by post‐polymerization addition of Lewis bases before functionalization. © 1999 Society of Chemical Industry