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Register a new userStudy of temperature and shear stress effects on the flow behavior of (ABS) melt
دراسة آثار درجات الحرارة و إجهادات القص على سلوك جريان البولي بوتاديين – ستيارين أكريل نتريل (ABS) في الحالة المنصهرة
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Added by
Damascus University ورقة بحثية
Publication date
2013
fields
Chemistry
and research's language is
العربية
Created by
Shamra Editor
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أجريت الدراسة على البولي بوتاديين – ستيارين أكريل نتريل في الحالة المنصهرة تحت تأثير درجات الحرارة و إجهاد القص و سرعة قص مختلفة، و ذلك باستخدام مقياس اللزوجة ذي القالب الشعري، و أجريت التصحيحات الضرورية للمعطيات التجريبية. و من خلال هذه المعطيات وجد أن اللزوجة الحقيقية تنخفض مع ازدياد إجهاد القص و سرعة القص. كما تبين أن المادة المدروسة من فصيلة اللدائن الشبيهة بالبلاستيك.
The rheological behaviour in the molten state of Acrylo nitril– Butadine – Styrene (ABS) according to temperature, shearing stress and shearing rate have been studied. Measurements were made with a capillary viscosimeter for the static properties. The correction of experimental data has been carried out. Viscosity decreases with increasing shear stress or shear rate in the nonnewtonian flow high polymer systems. However, the variation of activation energy with temperature at fixed shear rate is always less then at fixed shear stress.
References used
Bagley, E. B., 1957. End corrections in the capillary Flow. Of polyethylene, J. Appl, Phys., V. 28, p. 624
Bagley, E. B., 1961. Energy of Activation For viscous Flow. Trans. Soc. Rheol., V. 5, p. 355
Brydson, J. A., 1981. Flow properties of polymer melts, 2nd edition, Godwin. Cogswell, F. N., 1981. Polymer Melt rheology. London. John Willey. 50p
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يهدف العمل إلى اعتماد طريقة اللزوجة كطريقة لدراسة امتزاج البولميرات في الحالة السائلة بنسب
معينة.
و اختير محل السيكلوهكسانون و محل ثنائي ميثيل سلفواكسيد (DMSO) كمحلين ملائمين للبولي
فينيل كلوريد (PVC) و البولي بوتاديين أكريل نتريل (ABS) قمنا بتع
يين اللزوجة النسبية، و اللزوجة .
النوعية، و اللزوجة المختزلة لعدة تراكيز.
The Actual measurment of melt viscosity at a large number of
temperatures and shear rates is frequently a tedious and time
consuming task. The experimental validity for superimposing Log.
shear stress - Log shear rate curves at different temperatures along
the Log shear rate axis has been established for polycarbonate.
Compacting hot mixes asphalt (HMA) at low temperatures or mixing it in the asphalt at high temperatures is a constant source of concern to researchers, as compacting and mixing at non-ideal temperatures leads to adverse results, which negatively affect the properties of asphalt concrete and lead to problems paving.
Carnation is one of the most important crop for cut flowers not only in
Syria but all over the world.
The producers in Syria and in other countries are suffering during the
seasons of hot temperature from dwarfing of the plants and the production
of
small flowers.
The work conducted here was to investigate the effect of high temperature
on flower development and morphology.
In the present work, the rheological and mechanical properties of
polypropylene /thermoplastic starch (PP/TPS) and acrylonitril-butadienestyrene/
thermoplastic starch (ABS/TPS) blends were investigated. Starch was
plasticized using glycerol, and b
lends were prepared using a laboratory scale
with single screw extruder. Rheological properties of the prepared blends were
determined using a capillary rheometer. Mechanical properties were studied in
term of tensile tests, stress at break, strain at break and Young's modulus were
determined.
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