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Vol. 36 No. 9 (2024): Vol 36 Issue 9, 2024

Copyright (c) 2024 Parameswaran P Subramanian, Professor(Dr). Lity Allen Varghese, Dr. Rethikala P.K.

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This work is licensed under a Creative Commons Attribution 4.0 International License.

A Epoxidized Novolac Modification in Resol Phenolic under Open Mold Heat Curing for Microvoid Reduction

https://doi.org/10.14233/ajchem.2024.32231
Parameswaran P. Subramanian
Postgraduate Department of Chemistry and Research Center, Sanatana Dharma College, Alappuzha-688003, India
https://orcid.org/0000-0001-7571-3695
Lity Alen Varghese
Department of Chemical Engineering, National Institute of Technology Calicut, NIT Campus, Kozhikode-673601, India
https://orcid.org/0000-0001-9399-2106
P.K. Rethikala
Postgraduate Department of Chemistry and Research Center, Sanatana Dharma College, Alappuzha-688003, India
https://orcid.org/0009-0005-5631-0029

Corresponding Author(s) : Parameswaran P. Subramanian

psp@sdcollege.in

Asian Journal of Chemistry, Vol. 36 No. 9 (2024): Vol 36 Issue 9, 2024

Abstract

Resol phenolics were generally cured by temperature assisted compression molding. In this study, resol phenolic was modified using epoxidized novalacs (EN) and cured by heat assistance without pressure to find the influence of EN on the reduction of microvoids in cured resol phenolics. Epoxidized phenolic novolac (EPN), epoxidized p-cresol novolac (EPCN) and epoxidized o-cresol novolac (EOCN) were synthesized and used for modification of resols. The modification led to reduction in both the size and number of voids and increase in the tensile strength, flexural strength and impact strength of the resol phenolics. Epoxidized novolacs with phenol: formaldehyde ratios 1:0.7 and 1:0.9 exhibit comparatively better results for the resols. The decrease in the % soluble matter in the cured resin and FTIR spectrum show the incorporation of epoxidized novolacs to the resol phenolics. The dynamic mechanical analysis (DMA) confirms better damping properties of the modified resols. Thermogravimetric analysis shows improved thermal properties for the resol samples modified with EPN and EPCN. The optimum amount of epoxidies novolacs required for the modification was ~7.5-10%.

Keywords

Resols Epoxidized novolacs Thermoset modification Dynamic mechanical analysis Thermogravimetry
Subramanian, P. P., Varghese, L. A., & Rethikala, P. (2024). A Epoxidized Novolac Modification in Resol Phenolic under Open Mold Heat Curing for Microvoid Reduction. Asian Journal of Chemistry, 36(9), 2169–2178. https://doi.org/10.14233/ajchem.2024.32231
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