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Continuous Spin Fractionation and Characterization by Size-exclusion Chromatography for Styrene–butadiene Block Copolymers by Xiaopeng Xiong; John Eckelt; Bernhard A. Wolf; Zhengjun Zhang; Lina Zhang is a Chemistry article available to read on EtoBox.

What is Continuous Spin Fractionation and Characterization by Size-exclusion Chromatography for Styrene–butadiene Block Copolymers about?

Linear and star-shaped styrene-butadiene block copolymers synthesized by anionic polymerization of butadiene and styrene were fractionated by applying a newly developed large-scale fractionation technique, named continuous spin fractionation (CSF). Their molecular weight and polydispersity index (d = M w /M n ) were measured with size-exclusion chromatography and static light scattering. For the linear triblock copolymer a fractionation via temperature variation turned out to be better suited than the usual isothermal procedure. The star-shaped polymer with the d value of 1.33 was fractionated in two CSF steps to get the targeted sample, which has a considerably more uniform structure and a narrower molecular weight distribution (d = 1.11). The corresponding starting linear diblock copolymer was fractionated in one step reducing d from 1.68 to 1.17. With one set of simple laboratory equipment, 1 kg polymer can be fractionated per day. Utilizing CSF, for the first time, we fractionated successfully the block copolymers.

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Author

Xiaopeng Xiong; John Eckelt; Bernhard A. Wolf; Zhengjun Zhang; Lina Zhang

Publisher

Elsevier Science; Elsevier ; Elsevier BV (ISSN 1873-3778)

Published

2006

Language

EN

Field

Chemistry (Physical Sciences)