NDLI: Carbocationic polymerization of isoprene initiated by dimethylallyl derivatives associated with B(C6F5)3

Content Provider	Royal Society of Chemistry (RSC)
Author	Deffieux, Alain Peruch, Frédéric Ouardad, Samira
Copyright Year	2013
Abstract	The cationic polymerization of isoprene using dimethylallyl derivatives (3,3-DMAX)–B(C6F5)3 as initiating systems has been investigated in detail. In most cases, oligomers of low molar mass (Mn ≤ 1500 g mol−1) and narrow molar mass distribution (Mw/Mn ≤ 2) were formed, which contain isoprene units almost exclusively in a trans-1,4-configuration in combination with saturated ones, with sometimes a higher polymer fraction of high dispersity. Most of the oligomers are terminated by an olefinic terminal group due to intensive transfer via proton elimination whereas a small proportion of X-functionalized oligomers results from chain end recombination with the counterion. Besides, the high molar mass fraction is formed firstly via protonation of oligomer double bonds followed by propagation at low conversion and then via intermolecular branching yielding polyisoprenes with a high branching degree and/or gel formation at high monomer conversion. Most of the elementary reactions involved in these processes were shown to be dependent on the counteranion X of 3,3-DMAX.
Starting Page	1874
Ending Page	1882
Page Count	9
File Format	HTM / HTML PDF
ISSN	17599954
Volume Number	4
Issue Number	6
Journal	Polymer Chemistry
DOI	10.1039/c2py21005c
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Open
Subject Keyword	Molar mass Hydrogen Polymer Cationic polymerization China Film Giant Screen Molar mass distribution Genetic recombination Propellant mass fraction Oligomer Monomer Isoprene Counterion
Content Type	Text
Resource Type	Article
Subject	Organic Chemistry Biochemistry Bioengineering Biomedical Engineering Polymers and Plastics

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