کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1399967 984513 2011 8 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Polymerisation and structure–property relationships of Ziegler–Natta catalysed isotactic polypropylenes
موضوعات مرتبط
مهندسی و علوم پایه شیمی شیمی آلی
پیش نمایش صفحه اول مقاله
Polymerisation and structure–property relationships of Ziegler–Natta catalysed isotactic polypropylenes
چکیده انگلیسی

Polypropylene homopolymer samples were prepared with a Ziegler–Natta catalyst using two different external donors, namely diphenyldimethoxysilane (DPDMS), and methylphenyldimethoxysilane (MPDMS). Each donor was used in varying molar ratios to the catalyst in order to prepare samples for physical testing. The polymers were fully characterised and also fractionated by preparative TREF with characterisation of the fractions. In terms of the polymerisation reactions the DPDMS external donor exerts greater influence at the active sites than the MPDMS and produces polymer of higher molar mass and lower polydispersity. The physical properties of the polymers were investigated using microhardness measurements. It is revealed that the microhardness is strongly dependent on the stereoregularity of the samples.

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ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: European Polymer Journal - Volume 47, Issue 1, January 2011, Pages 70–77
نویسندگان
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