کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
5182573 1380992 2013 8 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Spatial distribution of crystal orientation in neck propagation: An in-situ microscopic infrared imaging study on polyethylene
ترجمه فارسی عنوان
توزیع فضایی جهت گیری کریستال در انتشار گردن: یک مطالعه تصویربرداری مادون قرمز در محل در پلی اتیلن
کلمات کلیدی
پلی اتیلن، تصویربرداری میکروسپتروسکوپی مادون قرمز تحول فوریه، تغییر شکل،
موضوعات مرتبط
مهندسی و علوم پایه شیمی شیمی آلی
چکیده انگلیسی

The deformation behaviors of three types of polyethylene (PE) with different molecular weights and short chain branch contents were studied by in-situ Fourier transformation infrared microspectroscopic imaging (FTIRI) with a Focal Plane Array (FPA) detector during uniaxial tensile test. The crystal orientation distributions within a 250 × 250 μm2 region during tensile test were obtained, especially in the front of necking profile. The results show that either increasing the molecular weight or adding the short chain branches could enhance the resistance of crystal to be orientated. With the aid of the Landau-de Gennes theory of nematic-isotropic transition, the spatial distribution of crystal orientation during the steady neck propagation is quantitatively analyzed, coupling with its corresponding mechanical behavior coherently. The theoretical analysis reveals that the constant Φ0 and the coefficient of the Gaussian term A in the Landau-de Gennes model are valid parameters to evaluate the mechanical property of PE materials, which may be generalized as a new method to quantify the mechanical property of semi-crystalline polymers.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Polymer - Volume 54, Issue 2, 24 January 2013, Pages 972-979
نویسندگان
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