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Synthesis and characterisation of methoxysilyl terminated polybutadienes
Author(s) -
Lindsell W. E.,
Radha K.,
Soutar I.
Publication year - 1991
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/pi.4990250102
Subject(s) - silylation , polybutadiene , polymer chemistry , tetrahydrofuran , telechelic polymer , butyllithium , dispersity , silane , polymer , end group , silanes , hydrolysis , chemistry , chlorosilane , materials science , organic chemistry , copolymer , catalysis , silicon , solvent
Polybutadienyllithium systems with M̄ n in the range 1.5 × 10 3 ‐20 × 10 3 are formed in hydrocarbon solvents by using n ‐butyllithium or 3‐dimethylamino‐propyllithium as initiator. These ‘living’ polymers, of low polydispersity and relatively high 1,4‐structure, react with 3‐chloropropyl(trimethoxy)silane at < − 20°C, in the presence of tetrahydrofuran, to give, primarily, polymers terminated by the 3‐chloropropyl(dimethoxy)silyl group, Si(OMe) 2 {(CH 2 ) 3 Cl}, as characterised by GPC and by 1 H, 13 C and 29 Si NMR studies. Quaternisation by iodomethane of the telechelic polybutadiene with a dimethylamino end‐group produces a silylated cationomer containing the terminal functionality, I −+ Me 3 N(CH 2 ) 3 . In some silylation reactions of polybutadienyllithium systems, especially at higher temperatures, and in related reactions with Si(OMe) 4 , polymers coupled via the silyl groups are also formed. Hydrolysis of the terminal dimethoxysilyl functions occurs under acidic or basic conditions; end‐group coupling to silica gel also occurs and other reactions have been investigated.