کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
7820749 1502466 2018 41 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Trans-1,4- stereospecific polymerization of isoprene with MgCl2-supported Ziegler-Natta catalyst I. Initial polymerization kinetic and polymerization mechanism
موضوعات مرتبط
مهندسی و علوم پایه شیمی شیمی آلی
پیش نمایش صفحه اول مقاله
Trans-1,4- stereospecific polymerization of isoprene with MgCl2-supported Ziegler-Natta catalyst I. Initial polymerization kinetic and polymerization mechanism
چکیده انگلیسی
Trans-1,4 stereospecific polymerization mechanism of isoprene with heterogeneous TiCl4/MgCl2-Al(i-Bu)3 Ziegler-Natta catalyst was investigated for the first time. The active centers with low steric hindrance gave the mixed cis-1,4/trans-1,4 units due to reversible anti-syn isomerization, the active centers with high steric hindrance formed by adsorption of Al(i-Bu)2Cl on Mg adjacent to the center Ti gave the high trans-1,4 units. The trans-1,4-polyisoprenes gradually increased with the increase in polymerization time accompanying with the gradually transformation of species with low steric hindrance to species with high steric species in the initial polymerization stage.263
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Polymer - Volume 140, 28 March 2018, Pages 255-268
نویسندگان
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