Study of Non-Isothermal Decomposition and Kinetic Analysis of 2,4-Dihydroxybenzoic Acid- Melamine-Formaldehyde Copolymer

S S Butoliya,A B Zade,W B Gurnule

doi:10.1155/2010/425626

Abstract

A copolymer (2,4-DHBAMF) synthesized by the condensation of 2,4-dihydroxybenzoic acid and melamine with formaldehyde in the presence of acid catalyst using varied molar proportions of the reactants. A composition of the copolymer has been determined by elemental analysis. The number average molecular weight has been determined by conductometric titration in non-aqueous medium. The copolymer has been characterized by UV-Visible, IR and1H NMR spectral analysis. Thermogravimetric analysis was carried out to study the decomposition and various kinetic parameters. Freeman Carroll and Sharp Wentworth methods have been applied for the calculation of kinetic parameters while the data from Freeman Carroll method have been used to determine various thermodynamic parameters such as order of reaction, energy of activation, frequency factor, entropy change, free energy change and apparent entropy change. The results indicate that given copolymer have potential as matrix resin for long term applications at temperature up to 350°C.

Highlights

The thermal degradation study of polymers has become a subject of recent interest
The 2,4-DHBAMF copolymer was prepared by condensing 2,4-dihydroxybenzoic acid (1.54 g, 0.1 mol) and melamine (1.26 g, 0.1 mol) with formaldehyde (11.1 mL, 0.3 mol) with the molar ratios of 1:1:3 in the presence of 2 M HCl as a catalyst (Scheme 1)
The copolymer was soluble in DMF, DMSO, THF, concentrated H2SO4 and NaOH solution and insoluble in almost all other organic solvents

Summary

Introduction

The thermal degradation study of polymers has become a subject of recent interest. It is very important property of polymer, which decides the thermal stability and processability of the polymer. Thermal data have been analyzed by Freeman-Carroll and Sharp-Wentworth methods. The Freeman-Carroll and Sharp-Wentworth methods have been used to calculate thermal activation energy and thermal stability.

Results

Conclusion