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Preparation of Chloro Penta Amine Cobalt (III) Chloride and Investigate its Influence on the Structural Properties and Acoustical Parameters of Polyvinyl Alcohol

Authors: Nada K. Abbas ندى كاظم عباس --- Majeed Ali Habeeb مجيد علي حبيب --- Alaa J. Kadham Algidsawi الأء جواد كاظم
Journal: Journal of Kufa - physics مجلة الكوفة للفيزياء ISSN: 20775830 Year: 2015 Volume: 7 Issue: 2 English and Arabic Pages: 81-96
Publisher: University of Kufa جامعة الكوفة

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Abstract

Chloro penta amine Cobalt (III) Cloride [Co(NH3)5Cl]Cl2 was prepared then characterized by FTIR and XRD . The obtained results indicated the formation of Orthorhombic [Co(NH3)5Cl]Cl2 nano particles of ≈ 28.75 nm size .Polymeric films based on polyvinyl alcohol PVA doped with Chloro penta amine Cobalt (III) Cloride [Co(NH3)5Cl]Cl2 at different weight percent ratios were prepared using the solvent cast technique. The structural properties of these polymeric films were examined by XRD, FTIR and SEM studies. The complexation of the additive with the polymer was confirmed by FTIR and SEM studies. The XRD pattern revealed that the amorphousicity of PVA polymer matrix increased with raising the [Co(NH3)5Cl]Cl2 content. Ultrasonic pulse technique of variable frequency (25, 30, 35 and 40) kHz were performed to study the influence of ultrasonic frequency on the mechanical properties of PVA/ [Co(NH3)5Cl]Cl2 composite. Some properties such as ultrasonic velocity, acoustic impedance ,bulk modulus and transmittance and relaxation amplitude were found to be decreasing with frequency while absorption coefficient and compressibility were increasing with frequency .Results showed that ultrasonic wave made degradation to the randomly coiled polymer chains ,when ultrasonic frequency increase there were more degradation that increasing the number of un-tied chains as a result of absorbing composite ultrasonic waves ,for this reason it could be pointed that PVA/[Co(NH3)5Cl]Cl2 composite as a good ultrasonic absorber. It was found that there was significant relationship between ultrasonic velocity and material properties


Article
A study of the effect of acid immersion on some physical properties of ( Epoxy – MgO) composites
دراسة تأثير الغمر بالحامض على بعض الخواص الفيزيائية لمتراكبات (الايبوكسي - اوكسيد المغنيسيوم)

Authors: Rifqa A. Salman رفقة عامر سلمان --- Jinan M. H. Jabir جنان محمد حسن جابر --- Salma M. Hassan سلمى محمد حسن
Journal: Iraqi Journal of Physics المجلة العراقية للفيزياء ISSN: 20704003 Year: 2015 Volume: 13 Issue: 26 Pages: 146-150
Publisher: Baghdad University جامعة بغداد

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Abstract

In this study a polymeric composite material was prepared by hand lay-up technique from epoxy resin as a matrix and magnesium oxide (MgO) as a reinforcement with different weight fraction (5,10,15, and 20)% to resin. Then the prepared samples were immersed under normal condition in H2So4(1 M) solution, for periods ranging up to 10 weeks. The result revealed that the diffusion coefficient decreasing as the concentration of MgO increase. Also we studied Hardness for the prepared samples before and after immersion. The result revealed that the hardness values increase as the concentration of MgO increase, while the hardness for the samples after immersion in H2SO4 decreased as compared to those before immersion. In addition, the dielectric strength decreasing by increasing the MgO concentration with time immersion.

تم في هذه الدراسة تحضير مادة متراكبة ذات اساس بوليمري باستخدام تقنية القولبة اليدوية وقد حضرت المادة المتراكبة من راتنج الايبوكسي كمادة اساس مدعم بمسحوق اوكسيد المغنيسيوم (MgO) وبكسور وزنية مختلفة (5,10,15 and 20)% ثم غمر النماذج المحضرة بالظروف الاعتيادية بمحلول حامض الكبريتيك(H2SO4) وبتركيز (1M) لفترة تصل الى 10اسابيع. حيث اظهرت النتائج ان معامل الانتشار يقل بزيادة نسبة دقائق التدعيم المضافة(MgO) . وكذلك تم دراسة اختبار الصلادة للنماذج المحضرة قبل وبعد الغمر حيث اظهرت النتائج ان قيم الصلادة تزداد بزيادة الكسور الوزنية لاوكسيد المغنيسيوم كما ان قيم الصلادة للنماذج قبل الغمر تمتلك اعلى قيم مقارنة مع قيم الصلادة بعد الغمر. اما متانة العزل فاظهرت النتائج انها تقل بزيادة كل من الكسور الوزنية المضافة ومدة الغمر.

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