Flexural Strength of Phenol Formaldehyde Composites Post-Cured in Microwaves: Preliminary Results
A commercial phenol formaldehyde based resole thermosetting resin supplied by Borden Chemical Australia Pty. was filled with ceramic-based fillers (Envirospheres or SLG) to increase its flexural strength. By performing flexural tests at a range of filler addition levels, the optimal addition level of SLG was able to be determined in terms of workability, cost and performance. The composites obtained were post-cured in conventional oven and in microwaves respectively. It was found that the maximum flexural strength of the microwave cured composites were only 5% lower than those cured in conventional oven when the percentage by weight of SLG was 24%. However, the time required for post-curing was also reduced from 10 hours (in conventional oven) to 40 minutes (in microwaves).
Yansheng Yin and Xin Wang
M. Trada et al., "Flexural Strength of Phenol Formaldehyde Composites Post-Cured in Microwaves: Preliminary Results", Advanced Materials Research, Vols. 79-82, pp. 1399-1402, 2009