A new insight into the mechanism of 1,3-dienes cationic polymerization. II. Structure of poly(1,3-pentadiene) synthesized with tBuCl/TiCl4 initiating system.

Autor: Rozentsvet, Victor A., Korovina, Nelly A., Ivanova, Valentina P., Kuznetsova, Marianna G., Kostjuk, Sergei V.
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Zdroj: Journal of Polymer Science. Part A, Polymer Chemistry; Aug2013, Vol. 51 Issue 15, p3297-3307, 12p
Abstrakt: ABSTRACT The microstructure of poly(1,3-pentadiene) synthesized by cationic polymerization of 1,3-pentadiene with tBuCl/TiCl4 initiating system is analyzed using one-dimensional- and two-dimensional-NMR spectroscopy. It is shown that unsaturated part of chain contains only homo and mixed dyads with trans−1,4-, trans−1,2-, and cis−1,2-structures with regular and inverse (head-to-head or tail-to-tail) enchainment, whereas cis−1,4- and 3,4-units are totally absent. The new quantitative method for the calculation of content of different structural units in poly(1,3-pentadiene)s based on the comparison of methyl region of 13C NMR spectra of original and hydrogenated polymer is proposed. The signals of tert-butyl head and chloromethyl end groups are identified in a structure of poly(1,3-pentadiene) chain and the new approaches for the quantitative calculation of number-average functionality at the α- and ω-end are proposed. © 2013 Wiley Periodicals, Inc. J. Polym. Sci., Part A: Polym. Chem. 2013, 51, 3297-3307 [ABSTRACT FROM AUTHOR]
Databáze: Complementary Index
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