Synthesis and characterisation of methoxysilyl terminated polybutadienes

W. E. Lindsell, K. Radha, I. Soutar

Research output: Contribution to journalArticle

Abstract

Polybutadienyllithium systems with M¯n in the range 1.5 × 103-20 × 103 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{(CH2)3Cl}, as characterised by GPC and by 1H, 13C and 29Si NMR studies. Quaternisation by iodomethane of the telechelic polybutadiene with a dimethylamino end-group produces a silylated cationomer containing the terminal functionality, I-+Me3N(CH2)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.

Original languageEnglish
Pages (from-to)1-6
Number of pages6
JournalPolymer International
Volume25
Issue number1
Publication statusPublished - 1991

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Polymers
Silanes
Silica Gel
Polydispersity
Hydrocarbons
Hydrolysis
Nuclear magnetic resonance
polybutadiene
Temperature
methyl iodide
tetrahydrofuran
n-butyllithium

Cite this

Lindsell, W. E., Radha, K., & Soutar, I. (1991). Synthesis and characterisation of methoxysilyl terminated polybutadienes. Polymer International, 25(1), 1-6.
Lindsell, W. E. ; Radha, K. ; Soutar, I. / Synthesis and characterisation of methoxysilyl terminated polybutadienes. In: Polymer International. 1991 ; Vol. 25, No. 1. pp. 1-6.
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Lindsell, WE, Radha, K & Soutar, I 1991, 'Synthesis and characterisation of methoxysilyl terminated polybutadienes', Polymer International, vol. 25, no. 1, pp. 1-6.

Synthesis and characterisation of methoxysilyl terminated polybutadienes. / Lindsell, W. E.; Radha, K.; Soutar, I.

In: Polymer International, Vol. 25, No. 1, 1991, p. 1-6.

Research output: Contribution to journalArticle

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AB - Polybutadienyllithium systems with M¯n in the range 1.5 × 103-20 × 103 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{(CH2)3Cl}, as characterised by GPC and by 1H, 13C and 29Si NMR studies. Quaternisation by iodomethane of the telechelic polybutadiene with a dimethylamino end-group produces a silylated cationomer containing the terminal functionality, I-+Me3N(CH2)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.

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