کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
5206768 | 1382320 | 2012 | 6 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Effect of dimethyl formamide in the synthesis of linear low density polyethylene on its rheological properties
دانلود مقاله + سفارش ترجمه
دانلود مقاله ISI انگلیسی
رایگان برای ایرانیان
کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
شیمی
شیمی آلی
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
Different amounts of dimethyl formamide (DMF) as an external electron donor have been used for the synthesis of LLDPE samples with different branch structure via gas phase polymerization of ethylene/1-butene copolymer with TiCl4/MgCl2 and triethyl aluminum catalyst system. Then, the effect of DMF (and consequently branch structure) on rheological properties of the synthesized samples, such as complex viscosity, MFI, loss modulus, storage modulus, transition point, power law index and Cole-Cole plot, have been studied. According to the obtained results, all of the curves relating the rheological properties of the samples to the ratio of DMF/Ti passed through an extremum point at about DMF/Ti = 0.25, which can be attributed to the changing of branch characteristic of the samples from heterogeneous viscous liquid-like structure to a uniform elastic three dimensional one at this extremum point.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Polymer Testing - Volume 31, Issue 5, August 2012, Pages 671-676
Journal: Polymer Testing - Volume 31, Issue 5, August 2012, Pages 671-676
نویسندگان
Sara Shahidi anvar, Naghmeh Fazeli, Milad Mehranpour,