Synthesis and characterization of polyesters from renewable cardol

  • Y. M. M. Makame
  • E. B. Mubofu
  • M. A. Kombo
Keywords: Cashew nut shell liquid, Cardol, Polyesters, Renewable polymers


The preparation and thermal characteristics of new polyesters from cardol, a renewable monomer obtained as a by-product of the cashew industry, are reported. Cardol - a diol component of the natural product cashew nut shell liquid (CNSL) was isolated and reacted with adipoyl chloride and terephthaloyl chloride in a 1:1 molar ratio in hexane and toluene as solvents at 170 °C under nitrogen atmosphere. The cardol based polyesters [poly(cardyl adipate) and poly(cardyl terephthalate)] were produced in good yields of up to 63 and 54%, respectively. The polymers were analysed by FT-IR for functional groups elucidation and by combined thermogravimetric analysis (TGA) and differential scanning calorimetry (DSC) for thermal stability. The cardol-based polyesters were thermally stable up to about 400 °C. The thermal stability of poly(cardyl terephthalate) was higher than that of poly(cardyl adipate) under similar conditions. All prepared polyesters were insoluble in common laboratory solvents at room temperature.


KEY WORDS: Cashew nut shell liquid, Cardol, Polyesters, Renewable polymers


Bull. Chem. Soc. Ethiop. 2016, 30(2), 273-282.



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eISSN: 1726-801X
print ISSN: 1011-3924