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Titlebook: Recent Advances in Anionic Polymerization; Proceedings of the I Thieo E. Hogen-Esch,Johannes Smid Conference proceedings 1987 Elsevier Scie

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书目名称Recent Advances in Anionic Polymerization
副标题Proceedings of the I
编辑Thieo E. Hogen-Esch,Johannes Smid
视频video
图书封面Titlebook: Recent Advances in Anionic Polymerization; Proceedings of the I Thieo E. Hogen-Esch,Johannes Smid Conference proceedings 1987 Elsevier Scie
描述Over the years the field of anionic polymerization has attracted numerous outstanding scientists, and today it still is being pursued by many researchers all over the world. The exciting discovery of termination-less polymerization processes and living polymers culminating in the development of narrow molecular weight polymers, star polymers, and tailor-made block and graft copolymers, contributed immensely to the rapid expansion of polymer science. Areas of active research in anionic polymerization presently include the structure of ion pairs and their role in regulating polymer structure, ring opening polymerization of heterocyclic monomers, synthesis of well-defined block and graft copolymers including the application of macromers in such systems, telechelic polymers with functional end groups, and other topics. New developments in the organic chemistry of carbanions such as dipolar carbanions impinge on the field of anionic polymerization. More sophisticated characterization techniques have been instrumental in obtaining better correlations between the structure of polymers and that of intermediates leading to their formation. This book contains the proceedings of the internati
出版日期Conference proceedings 1987
关键词polymerization
版次1
doihttps://doi.org/10.1007/978-94-009-3175-6
isbn_softcover978-94-010-7924-2
isbn_ebook978-94-009-3175-6
copyrightElsevier Science Publishing Co., Inc. 1987
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The Effect of Molecular Weight on Association in Anionic Polymerizationh high molecular weight species is sufficiently high that it modifies the kinetics of the propagation reaction. The kinetic order changes from one quarter to one half with dilution to follow the change in equilibrium, with parallel changes in activation energy. Also the propagation rate differs for very low molecular weight species.
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Kinetics and Thermodynamics of Anionic Polymerization of 2-Isopropenyl Pyridine in Tolueneer conditions of interest. We now wish to report the direct determination of both the rates of polymerization and depolymerization of 2-isopropenyl pyridine (2-IP) in toluene with Li. as counter-ion, and the comparison of the thermodynamic results with the kinetic data.
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Stereospecificity in Anionic Polymerizationth all counter-ions on the reaction time scale. Counter-ion positional exchange is however rapid in THF but slows somewhat in toluene. Diad structure is not defined until the next monomer adds. The determination of 1,2 or 1,4 structure in diene polymerization is decided in the same manner, a common characteristic of anionic polymerization.
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Cation Effects in Organoalkali Metal Chemistry, although here some small carbon-lithium covalency may enhance bonding [2]. From the simplified structure R.M., it is tempting to think that the nature of M. is unimportant, in other words, that one is concerned only with the chemistry of “carbanions” in discussing the reaction of R.M..
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Clarification of some Problems of Anionic Polymerizationpublished during the last 20 years [1], The published results are, on the whole, mutually consistent and accounted for by plausible mechanisms accepted by the workers in this field. There are, nevertheless, some contradictory claims pertaining mainly to polymerizations involving Li counter-ions and proceeding in hydrocarbon solvents.
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