Synthesis of branched polymers via radical copolymerization under oxygen inflowстатья
Статья опубликована в высокорейтинговом журнале
Информация о цитировании статьи получена из
Web of Science,
Scopus
Статья опубликована в журнале из списка Web of Science и/или Scopus
Дата последнего поиска статьи во внешних источниках: 26 декабря 2018 г.
Аннотация:Branched and highly-branched polymers were prepared through radical copolymerization of styrene (St) and divinylbenzene (DVB) in the presence of dissolved molecular oxygen (AIBN, 95 degrees C). The gel point (C-g) was found to depend on DVB/St ratio and oxygen concentration in liquid phase ([O-2]). Our data of size-exclusion chromatography (SEC) coupled to a multi-angle laser light scattering detector (MALLS) and differential refractive index detector (DRI) suggest that thus synthesized products are a mixture of primary polymer chains (PPCs) and branched macromolecules whose relative amount grows on approaching to C-g. Polymers with a largest amount of highly-branched macromolecules omega(HBP) approximate to 40 wt% were obtained in the vicinity of C-g. Synthesized polymers contain pendant double bonds [C=C] approximate to 1 x 10(-3) mol/g and some amount of peroxide groups [O-O] = (0.1-0.5) x 10(-3) mol/g. (C) 2014 Elsevier Ltd. All rights reserved.