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Article
Study of Intrinsic Viscosity and Flow Activation Energy of Some Polymers in Different Solvents

Author: Talib B. Kashmoula
Journal: AL-NAHRAIN JOURNAL FOR ENGINEERING SCIENCES مجلة النهرين للعلوم الهندسية ISSN: 25219154 / eISSN 25219162 Year: 2013 Volume: 16 Issue: 1 Pages: 30 -40
Publisher: Al-Nahrain University جامعة النهرين

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Abstract

The intrinsic viscosity has been studied forseveral polymers which are used in someindustrial applications, such as polyisobutylene oftypes Oppanol B150, 200, and 250 with differentmolecular weights of 2.5, 4.1 and 5.9 milliong/mole, respectively, which dissolved in crudeand gas oil. In addition three types of additivesbrought from Al-Dura refinery, olefin copolymer(OCP), {viscoples-4-677, viscoplex-215496, andLubrizol R 7077} which dissolved in crude oil,and the polymers which is soluble in water suchas polyacrylamide with high molecular weightand xanthan gum with molecular weight 3.7million g/mole where also studied. It was foundthat the intrinsic viscosity of polyisobutylenedecrease as the temperature increase in crude andgas oil. The olefin copolymer (Viscoplex-4-677)showed the same behavior as polyisobutylenewhere it can be used as drag reduction agent. Itwas noted that neutral polymers as well aspolyelectrolytes could be used as drag reductionagent.


Article
Theoretical study of Optimum conditions of intrinsic viscosity of polyethylene oxide solution using QSPR model
البحث في افضل تاثير للمتغيرات على اللزوجه الجوهرية [η] لمحلول بولي اثيلين اوكسايد باعادة تصميم موديل QSPR

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Abstract

AbstractQuantitative Structure–Property Relationship (QSPR) models method have been used for the prediction intrinsic viscosity of (poly ethylene oxide) in solution. Several models for the prediction of intrinsic viscosity have been drawn up by using the multiple regression technique. Penta models with R2 ranges from 0.87-0.99 by using MLR based on descriptors calculated from molecular structure have been developed present in this study. The results show excellent model with high correlation coefficient, minimum standard of error by using five parameters, which indicate that these parameters Total Energy T.E, capacity heat of organic solvent Cp(s), Van Der Waals Area V.W.AREA, The energy of Highest Occupied Molecular Orbital HOMO and The energy of Lowest Unoccupied Molecular Orbital LUMO, play an important role in effect on intrinsic viscosity of polymer in these solvents

الخلاصة العلاقة التركيبية الخصائصية الكمية استخدمت للتنبأ باللزوجة الجوهرية ل(بولي اثليين اوكسيد) في المحلول. عدة موديلات للتنبأ باللزوجة الجوهرية وضعت بأستخدام تحليل MLR . خمسة موديلات تملك معامل احصائي ضمن المدى R=0.87-0.99 باستعمال MLR اعتمادا على الموصوفات المحسوبه من التركيب الجزيئي . النتائج اظهرت أن أفضل موديل ممتاز والتي لها أفضل الوسائط الاحصائية ( اعلى قيمه لمعامل الارتباط واقل خطأ ) باستخدام خمس متغيرات , HOMO, LUMO, T.E, Cp(s) and V.W.AREA والتي اكدت بأن هذه المتغيرات تلعب دورا مهما في التأثير على اللزوجة الجوهرية[η] لمحلول بولي أثلين اوكسيد في المذيبات المختارة .


Article
Structure Rheology of Polyethylene Oxide Solution

Authors: Talib Omer Kashmola طالب عمر --- Estabraq Saad Kamil استبرق سعد
Journal: Iraqi Journal of Chemical and Petroleum Engineering المجلة العراقية للهندسة الكيمياوية وهندسة النفط ISSN: 19974884/E26180707 Year: 2014 Volume: 15 Issue: 1 Pages: 23-32
Publisher: Baghdad University جامعة بغداد

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Abstract

Intrinsic viscosities have been studied for polyethylene oxide in water which has wide industrial applications. The polyethylene oxide samples had two different structures, the first one was linear and covers a wide range of molecular weight of 1, 3, 10, 20, 35, 99, 370, 1100, 4600, and 8000 kg/mol and the second one was branched and had molecular weights of 0.55 and 40 kg/mol.Intrinsic viscosities and Huggins constants have been determined for all types and molecular weights mentioned above at 25ºC using a capillary viscometer. The values of Mark-Houwink parameters (K and a) were equal to 0.0068 ml/g and 0.67 respectively, and have not been published for this range of molecular weight in as yet.

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