Abstract
Microwave-promoted heating can successfully accelerate a reaction and reduce the formation of by-products. It is also advantageous for organic synthesis because it can improve the reaction yield and opens possibilities for the development of new types of reactions. Microwave-assisted chemistry is also considered as “sustainable chemistry”. In this study, the effect of microwave heating on the curing reaction of phenol-formaldehyde resin is investigated. The phenol-formaldehyde resin is a material that absorbs microwaves efficiently. It has been found that microwave heating accelerates the curing reaction of phenol-formaldehyde resin. Based on differential scanning calorimetry (DSC), it was found that the mechanisms of curing by traditional external heating and by microwave-promoted heating were different. The observed DSC profile showed an increase in the selectivity of the curing reaction by microwave heating, different from the curing reaction by traditional external heating. The observed results can be explained by the relative permittivity and dielectric loss tangent of each component of the phenol-formaldehyde resin.
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