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Register a new userPrediction of Melt Viscosity Flow Curves for Polycarbonate ( PC )
تنبؤ سلوكية الانسياب للبولي كربونات في الحالة المنصهرة بطريقة الإزاحة
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Added by
Damascus University ورقة بحثية
Publication date
1999
fields
Chemistry
and research's language is
العربية
Created by
Shamra Editor
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يستند مبدأ تنبؤ الإنسياب للبولي كربونات في الحالة المنصهرة على طريقة الإزاحة. تم ترسيم بيانات الإنسياب تحت تأثير إجهادات قص و درجات حرارة باستعمال مقياس اللزوجة في الحالة المنصهرة .
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.
References used
M. JAZIRI, Diplome de Doctorat. uneversite. JEAN MONNET. SATNTETINNE. FRANCE1992
Cogswell, F.N, converging flow of polymer melt in extrusion dies, polymer engineering and science1972
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Read More
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.
The study was carried out on the lithium Lubricants in the molten state
under the effect of tempearture, shear stress (τ), and shear rate (γ) by using
capillary viscometer, the corrections have been done to expermintal data. It
was found from the
obtained results that, real viscosity ηc decreased with
increasing real shear rate (γc). Also it was found that the lithium Lubricants is a
pseudoplastic material (n<1).
The aim of this work is to study the flow behavior of white Vaseline "which
is used in pharmaceutical industry and Cosmetics" in statical state.
The study was carried out on the white vaseline in the molten state under
the effect of temperture, sh
ear stress (τ), and shear rate (γ) by using capillary
viscometer, then the corrections have been done to expermintal data. It was
found from the obtained results that, real viscosity decreased with increasing
real shear rate (γc). Also it was found that the vaseline is a pseudoplastic
material (n<1).
For determining viscous activation energy at constant shear rtae (Eγ) and
shear stress (Eτ), the relationship between real viscosity (ηc) and (1/T) was
studied. It was found that the viscous activation energy decreased with
increasing the shear rate and shear stress, where the value of viscous activation
energy reflectes the temperature–sensitivity of real viscosity.
Elastic properties for vaseline were studied by determining the die swell
ratio (B) (Barus effet), and it was found that (B) increased with increasing
shear stress, but it decreased with increasing L/R ratio, while the temperature
do not have any effect on (B). The time residence (tr) of vaseline in the die was
deterimined and studied the relationship between (B) and (tr).
Note: vaseline does not carry any kind of bacteria, because it is unsuitable
medium for their growth.
درست في هذا البحث الخواص الديناميكية للبولي كربونات (P.C) في الحالتين المنصهرة و الصلبة
عند درجات الحرارة ٢٠٠ , ٢١٠ , ٢٢٠ , ٢٣٠ ºC و بزاوية تشوه للاجهاد ٢ْ ، و باستخدام جهاز
الميزان الريومتري نظام الدكتور كبيس.
In the present paper, we study the effect of both morphology and
compatibilization on the reaction to fire of blends of recycled
poly(ethylene terephthalate) (PET) with recycled polycarbonate (PC).
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