کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
10393017 | 887136 | 2005 | 8 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Rheological measuring techniques and their relevance for the molecular characterization of polymers
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی شیمی
جریان سیال و فرایندهای انتقال
پیش نمایش صفحه اول مقاله
![عکس صفحه اول مقاله: Rheological measuring techniques and their relevance for the molecular characterization of polymers Rheological measuring techniques and their relevance for the molecular characterization of polymers](/preview/png/10393017.png)
چکیده انگلیسی
The zero shear viscosity η0, the linear steady-state compliance and the elongational viscosity are rheological quantities, which can preferably be used for a molecular characterization of polymers. The techniques applied to obtain reliable results are described. It is demonstrated that linear polyethylenes of high-density fulfill the relationship η0 â¼Â Mw3.6 independently of the polydispersity. Mw is the absolute mass-average molar mass. Long-chain branched polyethylenes significantly deviate from this relation. The results from polyethylenes are used to characterize electron beam irradiated polypropylenes. It is clearly shown that long-chain branches are introduced by irradiation the topography of which changes with the dose. Measurements of the elongational viscosities support the conclusions from shear experiments. Creep tests in extension show the existence of steady-state elongational viscosities for the irradiated polypropylenes. The viscosities run through a maximum as a function of the elongational rates reached at steady state. The shape of the curves depends on the dose indicating once more a change in molecular structure by irradiation.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Non-Newtonian Fluid Mechanics - Volume 128, Issue 1, 1 June 2005, Pages 62-69
Journal: Journal of Non-Newtonian Fluid Mechanics - Volume 128, Issue 1, 1 June 2005, Pages 62-69
نویسندگان
Helmut Münstedt, Dietmar Auhl,