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Preparatin of polyamide (dimeric acid C36 with 1,5 -diaminopentane) and study of catalystes effect on kinetics of the reaction

تحضير بولي أميد ( الحمض الديميري C36 مع 1,5 - ثنائي أمينو البنتان ) و دراسة تأثير استخدام الحفازات في حركية التفاعل

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 Publication date 2014
and research's language is العربية
 Created by Shamra Editor




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Fattypolyamide was prepared by reaction of (1,5-Diamino pentane) with dimeric fatty acid C36 in molten state. The reaction was performed at 110 C˚ without catalyst, then with (Phosphoric acid, Sulphoric acid and Manganese dioxides). The Kinetic study was carried out on the reaction and followed by determining the acid value of the product. The polyamidation reaction was found to be on the overall a second order up to 59% conversion. Then the reaction order changes. We found that the Catalyst increases the velocity of the reaction with manganese dioxides the best Catalyst. The Degree of Polymerization, Number Average Molecular Weight and Weight Average Molecular Weight have been calculated during different times. The relationships between Degree of Polymerization and Number Average Molecular Weight, Weight Average Molecular Weight with times are linear until 59%conversion at 110˚C with used catalysts. The highest (N.A.M.W) and (W.A.M.W) was accomplished with the Catalyst MnO2.

References used
Ebewele, R.O., 1996. Polymer science and technology, University of Benin .Nigeria. P161
Chen, X., Zhong, H., Jia, L., Ning, J., Tang ,R., Qiao ,J., Zhang, Z., 2002. Polyamides derived from piperazine and used for hot-melt adhesives; Synthesis and properties. Int ,J.Adhes,22:75-79
Brydson, J. A., 1999. Plastics Materials, University of North London, p 478- 480
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Kinetic studies were carried out on the reaction between 2-Methyl 1,5 diaminopentane and dimeric fatty acids in melt phase. The reaction was performed at 113, 130, 140, 155, and 164 ºC and followed by determining the acid value of the product .The polyamidation reaction was found to be of overall second order with an activation energy of 45.48 k cal⁄g mol up to (52, 57, 79, 80, 86)% conversion at (113, 130, 140, 155, 164) ºC and overall third order with an activation energy of 43.73 k cal⁄g mol above (52, 57, 79, 80, 86)% conversion at (113, 130, 140, 155, 164) ºC.
Kinetic studies were carried out on the reaction between dimeric fatty acid C36 with 1.3 Diamino propane and 1.4 Diamino butane and 1.6 Diamino hexane and 1.8 Diamino octane in molten phase. The reaction was performed at 145ºC. The polyamidation r eaction was found to be on the overall a second order up to 83% conversion for reaction dimeric fatty acid C36 with 1.3 Diamino propane and 86% conversion for reaction dimeric fatty acid C36 with 1.4 Diamino butane and 87% conversion for reaction dimeric fatty acid C36 with 1.6 Diamino hexane and 1.8 Diamino octane then the reaction order changes to the third order above last conversion. The degree of polymerization,number average molecular weight and weight average molecular weight have been calculated during different times. Their relationships with the times are linear until last conversion. The melting point and thermodynamic constants for melting are determined by use of differential scanning calorimetry DSC. The melting point and thermodynamic constants increase by increasing the length of reacted amine series.
Study the kinetics degradation of poly (dimeric acid C36 with 1.9 – diamino nonane) was carried out by thermal analysis (TGA), and thermodynamic and equilibrium constants have been defined, moreover, study the kinetics of reaction between 1.9 – di amino nonane and dimer fatty acid C36 was carried out in molten state, the reaction was performed at 160 ºC, the acid value, and percentage of carboxylic functions of the product were determined. The polyamidation reaction was found to be of overall second order until conversion of 97% at 160 ºC, then the order of reaction changes.
Kinetic studies were carried out on the reaction between ′4,4-Methylenebis (2-methylcyclohexylamine) and dimeric fatty acid C36 in molten state by using a catalyst of sulpheric acid compared with the same kinetic of reaction without catalyst. The reaction was performed at 150, and 160 ˚C and followed by determining the acid value of the product.The polyamidation reaction was found to be of overall a second order until equilibrium state. Moreover, the catalyst increases speed of the reaction. Polyamidation reaction was automatic whereas the value of free energy was negative and the reaction was endothermic, and this is shown in change of positive enthalpy values.
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