Thermal degradation of HET-acid based unsaturated polyester resins: a kinetic analysis of thermogravimetric data

Vijayakumar, Chinnaswamy Thangavel; Vijayakumar, Sarasvathy; Sivasamy, P.

doi:10.1016/0040-6031(91)87042-u

Cited by 1 publication

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“…Vijayakumar et al [17], [18], [19], [20], [21], [22], [23], [24], [25], [26] synthesized HET acid based polyesters with ethylene glycol, 1,2-propane diol and 1,4-butane diol and studied their thermal degradation behavior using different instrumental techniques and established the degradation mechanism of HET acid based polyesters.…”

Section: Introductionmentioning

confidence: 99%

HET acid based oligoesters – TGA/FTIR studies

Rajkumar¹,

Vijayakumar²,

Sivasamy³

et al. 2008

European Polymer Journal

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One of the important reactive halogenated dicarboxylic acids used in the synthesis of flame retardant unsaturated polyester resins is 1,4,5,6,7,7-hexachlorobicyclo [2.2.1] hept-5-ene-2,3-dicarboxylic acid (HET acid). In the present investigation four different oligoesters are synthesized using HET acid as the diacid component and 1,2-ethane diol, 1,2-propane diol, 1,3-propane diol and 1,4-butane diol as the aliphatic diols. Melt condensation technique in vacuum is used for the synthesis of the oligoesters. The number average molecular weights of the oligoesters are determined using end group analysis. The degree of polymerization is estimated to be 3-5. The structural characterization is done using FTIR and NMR (1 H and 13 C) techniques. In the present investigation, TGA-FTIR studies for the different oligoesters are carried out in nitrogen atmosphere. The materials are heated from ambient to 600 °C at a heating rate of 20 °C/min. The main volatile products identified are CO, HCl, H2O, CO2, hexachlorocyclopentadiene and HET acid/anhydride. The evolution profile of these materials with respect to the structure of the oligoesters is discussed in detail and presented. The importance of β-hydrogens in the diol component and the plausible mechanism for the flame retardant behavior of these oligoesters are presented.

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