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

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...

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Bibliographic Details
Published in:Journal of materials science 2001-09, Vol.36 (17), p.4151-4157
Main Authors: REGHUNADHAN NAIR, C. P, BINDU, R. L, NINAN, K. N
Format: Article
Language:English
Subjects:
Applied sciences
Exact sciences and technology
Materials science
Organic polymers
Phenolic resins
Phenols
Physicochemistry of polymers
Polycondensation
Polymers
Preparation, kinetics, thermodynamics, mechanism and catalysts
Resins
Thermal stability
Thermodynamic properties
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Summary: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.
ISSN:0022-2461
1573-4803
DOI:10.1023/A:1017956619269