Initiation of Retarded Styrene Anionic Polymerization Using Complexes of Lithium Hydride with Organometallic Compounds
The hydrogenolysis of poly(styryllithium) species leads to the in situ formation of lithium hydride, which is able to reinitiate styrene anionic polymerization at 100 °C. However, the slow addition rate of LiH to styrene with respect to propagation yields incomplete initiation. The presence of an or...
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Published in | Macromolecules Vol. 36; no. 16; pp. 5988 - 5994 |
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Main Authors | , , |
Format | Journal Article |
Language | English |
Published |
Washington, DC
American Chemical Society
12.08.2003
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Subjects | |
Online Access | Get full text |
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Summary: | The hydrogenolysis of poly(styryllithium) species leads to the in situ formation of lithium hydride, which is able to reinitiate styrene anionic polymerization at 100 °C. However, the slow addition rate of LiH to styrene with respect to propagation yields incomplete initiation. The presence of an organometallic derivative such as dibutylmagnesium or triisobutylaluminum was found to improve both the solubility and the reinitiation efficiency of lithium hydride. This behavior is explained by the formation of bimetallic complexes which slow down the propagation and favor the initiation. Following these findings, the use of hydrogen as chain transfer agent in the anionic retarded polymerization of styrene was investigated. |
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Bibliography: | ark:/67375/TPS-W7QV0LNV-6 istex:C8D21D29E073A1B3464A70923DA1C0D3151EEBFD |
ISSN: | 0024-9297 1520-5835 |
DOI: | 10.1021/ma034256b |