Abstract ▼ AI-Helper

Epoxy resins certainly belong to very important class of commercial polymers, and remarkable developments in their new technologies have been recently proceeded. Especially novolac epoxy resins have been found to be particularly useful for the preparations of electrical and copper clad laminates, so...

Epoxy resins certainly belong to very important class of commercial polymers, and remarkable developments in their new technologies have been recently proceeded. Especially novolac epoxy resins have been found to be particularly useful for the preparations of electrical and copper clad laminates, solder mask resist ink for printed circuit board, and molding formulations. The separation of the conventional process for the preparations of epoxy resins takes a long time and the products contain residual chlorines which give rise to low grades for uses. In order to improve the phase separation, KOH that is highly reactive instead of NaOH as a catalyst was used. The manufacturing process modified by using KOH gave a good phase separation, high yield, and short process time. Novolac epoxy resins synthesized by the reaction of novolac and epichlorohydrine using KOH as a catalyst were confirmed by elemental analysis, Fourier transform infrared spectrum(FTIR), and H-NMR spectroscopes. By thermogravimetric analysis, it was found that the decomposition temperatures of the novolac epoxy resins prepared by the new method were higher than those made by the conventional process.