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Date: 1-9-2016
437
Date: 10-11-2019
496
Date: 26-9-2017
420
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VISCOSITY
The viscosity of a substance measures its resistance to flow. The melt viscosity of a polymer increases as the molecular weight of the polymer rises. Polymers with high melt viscosities require higher temperatures for processing.
The melt flow index describes the viscosity of a solid plastic. It is the weight in grams of a polymer extruded through a defined orifice at a specified time. The melt viscosity and the melt flow index can measure the extent of polymerization. A polymer with a high melt flow index has a low melt viscosity, a lower molecular weight, and usually a lower impact tensile strength.
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10 دقائق قبل النوم.. هذا الأسلوب يساهم في تحسين يومك
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الأسباب الشائعة لتفريغ شحن البطارية
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العتبة العباسية تستقبل أكثر من 1000 مواطنٍ لبنانيّ من ضيوف العراق
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