2.5. Ash Conte∘nt Determination. Approximately ±0.1g of the precursors and composite materials were measured into crucibles and heated in a muffle furnace at a temperature of about 500–600 C for 4 hours. e samples were withdrawn from the furnace aer ashing, allowed to cool in a desiccator, and then reweighed. e ash content of the precursors and composite materials was calculated by difference, and this process was carried out in triplicate.