Kinetics of reaction of hydrogenated dimer fatty acid C₃₆ with 2,7 diamino fluorene and determination of thermodynamic constants

H. Mohammad, N. Almahna and A. Falah

Physical Sciences Research International
Published: September 19 2013
Volume 1, Issue 3
Pages 76-88

Abstract

Kinetic studies were carried out on the reaction between 2,7 diamino fluorene and hydrogenated C₃₆ dimer fatty acid in melt phase. The reaction was performed at 135, 150, 160 and 170°C 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 48.55 kJ/gmol up to 58, 58, 59 and 60% conversion at 135, 150, 160 and 170°C, then the reaction will become overall third order. The Degree of Polymerization, Number Average Molecular Weight, and Weight Average Molecular Weight have been calculated during different times, relationships between the last properties with time is linear until 58, 58, 59 and 60% conversion at 135, 150, 160 and 170°C, respectively. The kinetic of degradation was carried out by using thermal analysis (TGA). Thermodynamic and equilibrium constants have been defined, where the kinetic of degradation was found to be of overall second order. We have found that the result compound is polyamide by use of infra-red spectroscopy.

Keywords: Kinetic, thermodynamic constants, dimer acid.

Full Text PDF