research centers


Search results: Found 2

Listing 1 - 2 of 2
Sort by

Article
EXCESS MOLAR VOLUMES, SURFACE TENSIONS,VISCOCITY DEVIATION AND FTIR SPECTROSCOPY OF 1-BUTANOL-ETHYL ACETATE BINARY SYSTEM MIXTURE

Author: Mustafa J. Nuhma
Journal: Al-Qadisiyah Journal for Engineering Sciences مجلة القادسية للعلوم الهندسية ISSN: 19984456 Year: 2017 Volume: 10 Issue: 4 Pages: 643-653
Publisher: Al-Qadisiyah University جامعة القادسية

Loading...
Loading...
Abstract

The physical properties (viscosity, surface tension and density) were computed in laboratory using different laboratory equipment for binary and pure system at (P=1 atm and T=25C). At mole fraction 0.5, the excess volume was found to be positive value while the deviation in viscosity and surface tension was found as negative values at the same mole fraction. Experimental excess properties were compared using Redlich-Kister equation and showed acceptable standard deviation. The inter molecular interaction of the 1-Butanol and Ethyl acetate found to be negligible and the vulnerability of the hydrogen bonds according to the FTIR spectra to a mixture of 1-Butanol and Ethyl acetate is consistent with the positive values of excess volume. Overlying the values of surface tension and the deviation in viscosity was found as negative values for all mole fractions studied.


Article
Extracting the Density Gradient Profile of Polyethylene Glycol from Bulk to Surface
حساب كثافة الشد السطحي لبولي اثيلين كلايكول من العمق الى السطح

Author: S. M. NURİ S. M. NURİ
Journal: kirkuk university journal for scientific studies مجلة جامعة كركوك - الدراسات العلمية ISSN: 19920849 / 26166801 Year: 2017 Volume: 12 Issue: 4 Pages: 337-352
Publisher: Kirkuk University جامعة كركوك

Loading...
Loading...
Abstract

In this work the Simha and Somcynsky (SS) lattice hole theory in conjunction with Cahn-Hilliard(CH) model have been used, (SS) theory describes the thermodynamic properties of both low and high molecular weight in terms of hole fraction, On the other hand (CH) describes the free energy profile of polymer surfaces or interfaces as an inhomogeneous mixture. CH consider the energy density to be two fold. The first is the constant free energy density for a homogeneous region of the system and the second is the density gradient contribution to the free energy. Have employed the mentioned theories in derive the new equations to extract in surface tension and surface depth profile in terms of chemical potential by means of SS theory. Starting form the atmospheric pressure to 150Mpa and for temperature range from 313 to 473 K, Then ıt is found the density profile of polyethylene glycol decrease as it is approached to the surfase. PVT characteristic parameters of the SS theory are calculated using the data of polyethylene glycol. the average and maximum value (at polyethylene glycol in different molecular weight

) ونظرية (SS تضمن الجزئيات ذات الاوزان الجزئية الواطئة والعالية , ومن ناحية اخرى يصف نظرية كاهن هيليارد الطاقة الحرة في السطح البوليمرات أو الطاقة الحرة في الوصلة ما بين عمق والسطح في الجزء المتجانس والغير المتجانس في المادة , يعتبر CH كثافة الطاقة الناتجة عن مساهمة اولهما كثافة الطاقة المتجانسة والثانيهما هي ميل الطاقة من المنطقة الغير المتجانسة الى الطاقة الحرة , وقد استخدمنا النظريات المذكورة في اشتقاق المعادلات الجديدة ولأول المرة (بولي أثيلين كلايكول) للاتتزاع في الشد السطحي ولمحة عن العمق الكيميائي للبوليمر تحت الدراسة ابتدآ من الضغط الجوي الى 150Mpa ودرجة الحرارة من 313K الى 473K وكانت نسبة الخطأ الحد الادنى والأقصى للحجم النوعي او الانحراف عن نسب الحقيقي لبوليمر بولي اثيلين كلايكول المستخرجة هي 0.03 و 0.28 على التوالي

Listing 1 - 2 of 2
Sort by
Narrow your search

Resource type

article (2)


Language

English (2)


Year
From To Submit

2017 (2)