Synthesis and characterization of polyisoprene/polybutadiene A2B2 star copolymers

Jürgen Allgaier; Ronald N. Young; Vasilis Efstratiadis; Nikos Hadjichristidis

doi:10.1021/ma951356b

Synthesis and characterization of polyisoprene/polybutadiene A₂B₂ star copolymers

Jürgen Allgaier, Ronald N. Young^*, Vasilis Efstratiadis, Nikos Hadjichristidis

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

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Abstract

Two routes for the synthesis of star block copolymers having exactly two arms of polyisoprene (PI) and two of polybutadiene (PB) are described. The first route starts by condensing one molecule of silicon tetrachloride with two of poly(isoprenyl)lithium which has been end-capped by a few units of styrene. The second route starts by linking two poly(isoprenyllithium) chains with one molecule of silicon tetrachloride at a suitably reduced temperature. Both routes are completed by reaction of the two-armed intermediate (PI)₂SiCl₂ with an excess of poly(butadienyllithium). The resulting (PI)₂Si(PB)₂ star polymer was purified by fractionation. The reaction steps were monitored by size exclusion chromatography and the products characterized by low-angle laser light scattering, osmometry, and NMR.

Original language	English (US)
Pages (from-to)	1794-1797
Number of pages	4
Journal	Macromolecules
Volume	29
Issue number	5
DOIs	https://doi.org/10.1021/ma951356b
State	Published - Feb 26 1996
Externally published	Yes

ASJC Scopus subject areas

Organic Chemistry
Polymers and Plastics
Inorganic Chemistry
Materials Chemistry

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title = "Synthesis and characterization of polyisoprene/polybutadiene A2B2 star copolymers",

abstract = "Two routes for the synthesis of star block copolymers having exactly two arms of polyisoprene (PI) and two of polybutadiene (PB) are described. The first route starts by condensing one molecule of silicon tetrachloride with two of poly(isoprenyl)lithium which has been end-capped by a few units of styrene. The second route starts by linking two poly(isoprenyllithium) chains with one molecule of silicon tetrachloride at a suitably reduced temperature. Both routes are completed by reaction of the two-armed intermediate (PI)2SiCl2 with an excess of poly(butadienyllithium). The resulting (PI)2Si(PB)2 star polymer was purified by fractionation. The reaction steps were monitored by size exclusion chromatography and the products characterized by low-angle laser light scattering, osmometry, and NMR.",

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T1 - Synthesis and characterization of polyisoprene/polybutadiene A2B2 star copolymers

AU - Allgaier, Jürgen

AU - Young, Ronald N.

AU - Efstratiadis, Vasilis

AU - Hadjichristidis, Nikos

PY - 1996/2/26

Y1 - 1996/2/26

N2 - Two routes for the synthesis of star block copolymers having exactly two arms of polyisoprene (PI) and two of polybutadiene (PB) are described. The first route starts by condensing one molecule of silicon tetrachloride with two of poly(isoprenyl)lithium which has been end-capped by a few units of styrene. The second route starts by linking two poly(isoprenyllithium) chains with one molecule of silicon tetrachloride at a suitably reduced temperature. Both routes are completed by reaction of the two-armed intermediate (PI)2SiCl2 with an excess of poly(butadienyllithium). The resulting (PI)2Si(PB)2 star polymer was purified by fractionation. The reaction steps were monitored by size exclusion chromatography and the products characterized by low-angle laser light scattering, osmometry, and NMR.

AB - Two routes for the synthesis of star block copolymers having exactly two arms of polyisoprene (PI) and two of polybutadiene (PB) are described. The first route starts by condensing one molecule of silicon tetrachloride with two of poly(isoprenyl)lithium which has been end-capped by a few units of styrene. The second route starts by linking two poly(isoprenyllithium) chains with one molecule of silicon tetrachloride at a suitably reduced temperature. Both routes are completed by reaction of the two-armed intermediate (PI)2SiCl2 with an excess of poly(butadienyllithium). The resulting (PI)2Si(PB)2 star polymer was purified by fractionation. The reaction steps were monitored by size exclusion chromatography and the products characterized by low-angle laser light scattering, osmometry, and NMR.

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Synthesis and characterization of polyisoprene/polybutadiene A₂B₂ star copolymers

Abstract

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