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The Structure of Cationic Polyisoprene: Branching versus Cyclization
Author(s) -
Rozentsvet Victor A.,
Kozlov Valery G.,
Korovielly A.,
Stotskaya Olesya A.,
Gnezdilov Oleg I.,
Kostjuk Sergei V.
Publication year - 2016
Publication title -
macromolecular chemistry and physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.57
H-Index - 112
eISSN - 1521-3935
pISSN - 1022-1352
DOI - 10.1002/macp.201600129
Subject(s) - degree of unsaturation , branching (polymer chemistry) , macromolecule , cationic polymerization , polymer chemistry , polymer , chemistry , molar mass distribution , long chain , fraction (chemistry) , polymer science , organic chemistry , biochemistry
The structure, molecular weight, and molecular weight distribution (MWD) of polyisoprene fractions, which were obtained during the fraction of polyisoprene with broad MWD ( M w / M n = 25.6) synthesized with t BuCl/TiCl 4 initiating system have been investigated. It is established that chain transfer to polymer leading to branched macromolecules is responsible for the formation of polyisoprene with broad MWD and reduced unsaturation. It is shown for the first time that unsaturation decreased while the content of head and end groups in a single macromolecule increased with increasing molecular weight of polyisoprene fraction. The unsaturated part of the polymer chain consists of presumably trans ‐1,4‐units independently of the molecular weight of polyisoprene fraction.