Preparation of asymmetric three-arm polybutadiene and polystyrene stars

The synthesis of three-armed polybutadiene and polystyrene stars is described for the case where one of the three arms differs in molecular weight from the remaining two. The preparative approach involves the reaction of methyltrichlorosilane with the chain end active centers under conditions unfavo...

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Bibliographic Details
Published inMacromolecules Vol. 21; no. 4; pp. 1094 - 1099
Main Authors PENNISI, R. W, FETTERS, L. J
Format Journal Article
LanguageEnglish
Published Washington, DC American Chemical Society 01.04.1988
Subjects
Applied sciences
Exact sciences and technology
Organic polymers
Physicochemistry of polymers
Polymers with particular structures
Preparation, kinetics, thermodynamics, mechanism and catalysts
Asymmetry
Branched polymer
Butadiene polymer
Preparation
Styrene polymer
Star polymer
Gel permeation chromatography
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Summary:The synthesis of three-armed polybutadiene and polystyrene stars is described for the case where one of the three arms differs in molecular weight from the remaining two. The preparative approach involves the reaction of methyltrichlorosilane with the chain end active centers under conditions unfavorable to chain coupling or linking, i.e. the synthesis of linear doublet chains or three-arm stars. Some observations regarding thermal-induced post-polymerization side reactions that distort the near-monodisperse nature of the molecular weight distributions obtainable for polybutadiene are described. Preparative conditions must be selected to avoid such side reactions if "model" branched polybutadienes are required. 85 ref.--AA
Bibliography:ObjectType-Article-2
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ISSN:0024-9297
1520-5835
DOI:10.1021/ma00182a041