Study on Thermal Degradation of Phenolic Resin

Abstract:

The thermal degradation of phenolic formaldehyde resins (PF) were studied using thermo gravimetric analysis (TGA). The evolved volatiles during thermal degradation of PF were examined by mass spectrometry (MS). The structure changes of thermal degradation of synthetical phenolic resin (PF_1.2) and commercial resin (CPF) were investigated by solid-state ¹³C nuclear magnetic resonance (¹³C-NMR) techniques. The experimental results show that the degradation process of PF could be separated into three stages. In the first stage, ether bonds and unreacted terminal hydroxymethyl groups of the cured resin degraded. Methylene bridges decomposed into methyl groups then yielded both phenol and cresol homolog in the second stage. In the third stage, cyclodehydration and forming char of phenolic hydroxyl occurred. Our study showed that the main thermal degradation of PF in the second stage is the decomposition reaction of the methylene bridges instead of auto-oxidation of the methylene bridges reported in previous works.

• Periodical: Applied Mechanics and Materials (Volume 422)
• Pages: 24-28
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.422.24
• Online since: September 2013
• Authors: Zhi Qin Chen*, Yang Fei Chen, Hong Bo Liu
• Keywords: ¹³C-NMR, MS, Phenolic Resin, TG, Thermal Degradation

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