Syndiotactic polypropylene - synthesis and propertiesстатьяИсследовательская статья
Информация о цитировании статьи получена из
Scopus,
Web of Science
Статья опубликована в журнале из списка Web of Science и/или Scopus
Дата последнего поиска статьи во внешних источниках: 18 июля 2013 г.
Аннотация:Propylene was polymerized with MAO-activated metallocene catalyst Ph2C(CpFlu)ZrCl2 [h5, h5'-1,9'-diphenylmethylidene-(cyclopentadienyl)(fluorenyl)]-dichlorozirconium(IV) and properties of the resulting syndiotactic PP (sPP) were measured. The catalytic system selected allowed to achieve high polymerization rates and high values of molecular weight and syndiotacticity of the polymer. Studies of the M(bar)n vs. [H2] relationship gave the ratios of the polymer chain propagation and monomer- and/or hydrogen-caused chain transfer rate constants. 13C-NMR spectroscopy data showed each PP to have almost identical pentad content. As compared with isotactic propylene (iPP), sPP is much more elastic and exhibits the higher impact strength.