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Article
Synthesis and Characterization of Some New Derivatives From 2-Mercaptobenzoxazole
تحضير وتشخيص بعض المشتقات الجديدة من 2- مركبتو بنزواوكسازول

Authors: Mohammad R. Ahmad محمد رفعت احمد --- Ali A. Mohsen علي أياد محسن
Journal: Iraqi Journal of Science المجلة العراقية للعلوم ISSN: 00672904/23121637 Year: 2015 Volume: 56 Issue: 1B Pages: 303-315
Publisher: Baghdad University جامعة بغداد

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Abstract

In this work 2-mercaptobenzoxazole (2-MBO) (1), was prepared by using homemade Auto clave .The synthesis involve treatment of 2-MBO with 2-chloro acetyl chloride to give 2-chloroacetyl thio benzoxazole (2), the product was treated with phenyl hydrazine to give 2-phenyl hydrazide acetyl thio benzoxazole (3). The new derivatives (4-13) were synthesized by reaction of 2-phenyl hydrazide acetyl thio benzoxazole (3) with different aromatic aldehydes in the presence of acetic acid. The compound (2) was treated with hydrazine hydrate to give product (14) then treated with different aromatic aldehydes in the presence of glacial acetic acid to give Schiff bases derivatives (15-24). Structure of all the prepared compounds confirmation were proved using (FT-IR), (1H-NMR), (13C-NMR) spectra and elemental analysis (C .H .N.S) in addition to melting points.

حضر2- مركبتو بنزواوكسازول (1) ,حيث تم تحضير المركب (1) بواسطة جهاز Auto clave)) المصنع محليا. التحضير بتضمن معاملة 2- مركبتوبنزواوكسازول مع 2- كلورواستيل كلورايد ليعطي 2- كلورواسيتل ثايو بنزواوكسازول (2),ثم معاملة الناتج مع فنيل هيدرازين ليعطي 2- فنيل هيدرازايد استيل ثايو بنزواوكسازول (3). ثم فوعل مركب (3) مع الالديهايدات الاروماتية المختلفة بوجود حامض الخليك للحصول على المشتقات الجديدة (4-13), اما المركب (2) فعومل مع الهيدرازين المائي ليعطي مركب (14), حيث يتم معامله هذا المركب مع الالديهايات الاروماتية المختلفة بوجود حامض الخليك الثلجي للحصول على مشتقات من قواعد الشيف (15-24) .وتم تشخيص تراكيب جميع المركبات المحضرة بمطياف (FT-IR), (1H-NMR),(13C-NMR) والتحليل الدقيق للعناصر (C.H.N.S) اضافة الى درجة الانصهار.


Article
An Experimental Approach and Constructing a New Non-Linear Regression Model for Prediction the Anisotropy Parameters of Annealing Treated Commercially Pure Aluminum Sheets

Authors: Jabbar H. Mohmmed --- Ali A. Mohsen --- Bassam A. Ahmed --- Najmuldeen Yousif Mahmood
Journal: Engineering and Technology Journal مجلة الهندسة والتكنولوجيا ISSN: 16816900 24120758 Year: 2016 Volume: 34 Issue: 14 Part (A) Engineering Pages: 2775-2783
Publisher: University of Technology الجامعة التكنولوجية

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Abstract

Earing is a common phenomenon in deep drawing process that increases the waste of metal. This phenomena is affected by material anisotropy, thus, it is important to study the effects of material parameters on this material behavior. This paper focuses on identify the optimal condition of annealing treatment which result in higher value of normal anisotropy and lower value of planar anisotropy which lead to reduce the waste material in subsequent forming processes. Therefore, in this study, anisotropic behavior and formability of commercially pure aluminum thin sheets was investigated after annealing the samples at different temperatures (350, 400, and 450) °C. Uniaxial tensile tests were carried out at room temperature (25°C) to evaluate formability parameters. For this purpose different tensile test samples in the directions of 0°, 45° and 90° in respect to the rolling direction were prepared. In addition to, metallographic test was carried out to as-received and annealed samples to observe the changes in microstructure. Plastic strain ratio and planar anisotropy of samples were calculated from the tensile test data. Based on the tensile test results of samples, the earing phenomenon due to planar anisotropy in commercially pure aluminum sheet was analyzed. The results indicate that the annealing at 400°C brought the optimum conditions.Moreover, new regressions model for prediction the anisotropy parameters of sheet metal using statistical techniques (SPSS software) were constructed in this work. The experimental data were compared to those predicting values. A comparison clearly indicates that there are good identification between measured and predicted values with multiple correlation coefficients R of 0.932 and accuracy of about 87 %. The results reveal that the proposed model is effective and reliable tool to obtain accurate prediction of the anisotropy behavior of metal sheets.

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