Effect of power ultrasonic on the viscosity of anhydride epoxy resin system

The effect of power ultrasonic (US) on the viscosity of an anhydride epoxy resin system has been investigated. Especially, the potential reduction of the viscosity could be used prospectively for the production process pultrusion in the variation of closed injection pultrusion. An ultrasonic sonotrode is integrated into a rheometer to directly determine the influence of US on the viscosity of the epoxy resin Biresin® CR141. The temperature is determined during the ultrasonic excitation to consider the effect of US and temperature on the viscosity separately. The results demonstrate that the viscosity can be reduced by at least 80% points within 5 ​s using US. The temperature of the sonicated resin system increases from 30 ​°C to a maximum of 63-71 ​°C. In terms of the viscosity of the resin system, the result is that the decrease in viscosity is only due to the increase in temperature.