Hydrogen‐peroxide‐initiated polymerization of isoprene in alcohol solutions

Abstract

SYNOPSISThe radical polymerization of isoprene in alcohol solutions initiated by hydrogen peroxide was studied. It was found that alcohols were components of the initiated system and that their fragments with hydroxyl groups were included in every second molecule of an oligomer irrespective of the type of alcohol, of the monomer conversion, and of the oligomer molecular weight. The oligomer yields and its molecular weight were determined by alcohols through their effect upon the phase state of polymerization systems.

Kinetic acetylation of hydroxyl groups of isoprene copolymer and hydroxyethyl methacrylate

“…Нами получено значение 25,5 % концевых групп, то есть часть концевых ГГ замещена другими группами. В работе [11] было показано, что каждая четвертая концевая ГГ в олигодиенах, полученных с пероксидом водорода, является третичной, которая не вступает ISSN 2226-3780 в реакцию ацетилирования. С учетом этого обстоятельства первичных концевых ГГ, вводимых гидроксильными радикалами, должно быть 34,2*0,75 = 25,6 %, что практически совпадает с найденным экспериментально значением.…”

“…С учетом этого обстоятельства первичных концевых ГГ, вводимых гидроксильными радикалами, должно быть 34,2*0,75 = 25,6 %, что практически совпадает с найденным экспериментально значением. Этот факт является дополнительным доказательством правильности полимеризационной схемы, предложенной в [11], согласно которой в инициировании полимеризации принимает участие растворитель. В данном случае это изопропиловый спирт, α-радикал которого вводит неактивные третичные ГГ.…”

The effect of solvent on the microstructure, nature of hydroxyl end groups and kinetics of polymerization reaction in synthesize of hydroxyl terminated polybutadiene

“…The preparation of HTPB can be accomplished by free radical or anionic polymerization of butadiene in the presence of free radical initiators such as peroxides or azo compounds and ionic initiators such as organolithium compounds [1,2]. The hydrogen peroxide-initiated radical polymerization of diene monomers in alcohol solutions is an easy and effective way to obtain oligodienes with hydroxyl end groups [3].…”

Polymerization of Isoprene in Ethylacetate in the Presence of Hydrogen Peroxide

“…Understanding the influence of solvent used in radical polymerization in the course of time changed from the complete ignoring to the recognition of its role as an agent of chain transfer, further as medium, in which the decomposition of initiator and reactions of primary radicals in a cage take place, then as an agent that affects the process of polymerization by selective solvation of monomers and by intermolecular donor and acceptor interaction with monomers [1][2][3][4][5]. The last data [6,7] testify that in some systems solvent can be a competent participant of chemical transformations, which take place in the polymerization system. These features of the solvent influence evidently show up at the use of hydrogen peroxide (HP) as initiator [6][7][8].…”