Thermogravimetric Analysis of p-Hydroxy-Benzoic acid Melamine-Formaldehyde Tercopolymers

Abstract

Polymers were prepared by the condensation of p-hydroxy benzoic

[PB], melamine [M] and formaldehyde [F] in the presence of hydrochloric

acid (2 M) as catalyst with varying molar ratios of reacting monomers.

Polymers were characterised by their IR spectra, elemental analysis, TGA,

DTA and Mn as determined by vapour pressure osmometry as well as

non-aqueous conductometric titrations. The kinetic and thermodynamic

parameters such as, order of reaction, energy of activation, frequency

factor, entropy change, free energy change and apparent entropy change

have been determined. Freeman-Carroll and Sharp-Wentworth methods

have been applied for the calculation of kinetic parameters, while the data

from the Freeman-Carroll method have been used to determine various

thermodynamic parameters.