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Phenyl ethynyl functional addition cure phenolic resins: Synthesis, characterisation and thermal properties

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Abstract

Phenyl ethynyl functional addition curable phenolic resins were synthesised by reacting a mixture of phenol and 3-(phenylethynyl) phenol (PEP) with formaldehyde in presence of an acid catalyst. Relatively narrow molar-mass distributed polymers were obtained in good yield. The presence of PEP led to reduced molar-mass and narrow distribution of the copolymers. The resin underwent thermal curing at around 250–275°C, much lower than the cure temperature of PEP. The thermal stability and anaerobic char residue of the cured resins increased with increase in ethynyl-content and these properties were more than those of resol resin. These addition cure phenolics provided an overall increase in char of about 70% vis-à-vis resol resin when compared on the basis of uncured resins.

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Authors and Affiliations

  1. Propellant and Special Chemicals Group, Vikram Sarabhai Space Centre, Trivandrum-, 695 022, India

    C. P. Reghunadhan Nair, R. L. Bindu & K. N. Ninan

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  1. C. P. Reghunadhan Nair
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  2. R. L. Bindu
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  3. K. N. Ninan
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Nair, C.P.R., Bindu, R.L. & Ninan, K.N. Phenyl ethynyl functional addition cure phenolic resins: Synthesis, characterisation and thermal properties. Journal of Materials Science 36, 4151–4157 (2001). https://doi.org/10.1023/A:1017956619269

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