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Register a new userتعيين امتزاج بولي فينيل كلوريد PVC و بولي بوتاديين ستيارين أكريل نتريل ABS في الحالة السائلة بطريقة اللزوجة
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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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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 بتعيين اللزوجة النسبية، و اللزوجة . النوعية، و اللزوجة المختزلة لعدة تراكيز.
No English abstract
References used
G. RIESS PROC. IUPAC MACRO ٨٢. AMHERST. MASSA–CHUSETTS
L. A. UTRACKI, A. M. CATANI, G. L. BATA. M. R. KAMAL AND V. TAN. J. APPL. POLYM. SCI
rate research
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.
In this research we have prepared thin films from poly vinyl chloride (PVC) by spin
coating technique in three velocities (1000,2000,3000)RPM on glass substrate (Micro
scope cover glass), at room temperature. The absorbance A, and transmittance T f
or the
films were studied in the visible and ultra-violet region (UV-VIS). In addition,we have
calculated the absorbance coefficient α, skin depth δ, refractive index no, dielectric
constant ε (the real part and the imaginary part), also we have calculated the energy band
gap of allowed and forbidden direct transitions.
The films showed high transmittance (80-90)%, in the infrared region as a function
of the spinning velocity and took the maximum value 80% for the velocity 1000RPM, and
90% for the velocity 3000RPM, and the refractive index was decreased with the velocity
increase, we found it between3.67 and 4.56 for the velocities 3000RPM and 1000RPM
respectively. Whereas the skin depth δ decreased with the increasing of velocity, the
minimum value was 0.0000531cm for the velocity 3000RPM and the maximum value was
almost 0.00023cm for the velocity 1000RPM.
In this study we used electro spinning technology to obtain
nonwoven webs of Nano fibers of poly vinyl alcohol and Nano
particles of silver . we dissolve the polymer poly vinyl alcohol in
it's solvent (water) to form a polymeric solution that we c
harged it
by positive charge and ejected it to leaving it on a collector that
we charged it by negative charge and used a high voltage. and
we mixed the polymer poly vinyl alcohol with silver nitrate with
different concentrations and electro spinning the mixture to obtain
Nano fibers and Nano particles of silver then we applied heat
treatment for the whole samples at 155°c for 5 minutes for tow
aims the first one is to make crosslinking between series of PVA
and the second is for the stability of silver nanoparticles , finally
we analyze samples on Scanning Electron Microscopy SEM .
The pollution is one of the most important problems facing the
electrical networks, especially in the Syrian Arab Republic, and
after that expanded of pollution sources on the one hand, and
because the power supply has become related to all economic
and daily life sections.
اهتمت هذه الدراسة بتطوير صناعة مواد بوليميرية جديدة، و نظراً للأهمية الكبيـرة لعديـد التكـاثف
البولي إيبوكسي، قمنا بدراسة قساوته عندما يكون نقياً، و من ثم شكّلنا خلائط منه مع عديد تكاثف آخـر
هو البولي فينوكسي بنسب محددة مختلفة، كما قمنا بتشكيل صفائ
ح كومبوزيت من الخلائط السابقة مـع
ألياف الزجاج تارة و الألياف الصخرية تارة أخرى و حددنا قساوتها.
رافقت دراسة القساوة للعينات السابقة، دراسة لأطيافها ما تحت الحمراء و ذلـك لمقارنـة التركيـب
بالقساوة، هذا و نوقشت تطبيقات هذه المادة في الحياة العملية أيضاً.
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