کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
5188421 | 1381155 | 2006 | 8 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Non-Cp type titanium precatalysts for ethylene/norbornene copolymerization
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
شیمی
شیمی آلی
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![عکس صفحه اول مقاله: Non-Cp type titanium precatalysts for ethylene/norbornene copolymerization Non-Cp type titanium precatalysts for ethylene/norbornene copolymerization](/preview/png/5188421.png)
چکیده انگلیسی
Ethylene/norbornene monomers were homo- as well as copolymerized using titanium-based non-Cp precatalysts [2-(2,6-dialkylphenylamino)-1-phenylethoxy TiCl2] in the presence of methylaluminoxane. The precatalysts polymerized ethylene with moderate activities that increased with increase in temperature reaching a maximum yield of polyethylene at 70 °C. However, these catalysts showed relatively low activity towards norbornene homopolymerization. Precatalysts 1ATiCl2 and 3ATiCl2 were used for ethylene/norbornene copolymerization. The microstructural analysis of these copolymers suggests that these are alternating copolymers with meso (major) and racemic (minor) sequences. Higher norbornene incorporation in the copolymer was obtained with precatalyst 3ATiCl2, which is a more “open” catalyst system. The reactivity ratios for ethylene/norbornene copolymerization suggest that these precatalysts show lesser tendency towards norbornene homopropagation in the copolymerization reactions.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Polymer - Volume 47, Issue 25, 22 November 2006, Pages 8289-8296
Journal: Polymer - Volume 47, Issue 25, 22 November 2006, Pages 8289-8296
نویسندگان
Kari Vijayakrishna, Govindarajan Sundararajan,