Abstract
Dioctyl and dicetyl esters and their mixtures with either polyethylene (PE) or polyvinylchloride (PVC) were carbonized at 650°C under a pressure of 30 MPa. Dioctyl phthalate, malonate, and succinate gave carbon spherules after pressure carbonization. The mixtures of dicetyl phthalate and succinate with PVC as well as those of dioctyl maleate and polyethylene terephthalate (PET) with PE also yielded carbon spherules. The esters are presumed to decompose thermally to the functional and hydrocarbon components, the former corresponding to the decomposition product of PVC and the latter to that of PE mixtures of which have been found to form carbon spherules by pressure carbonization. The ratio of the numbers of carbon atoms in these two components, R( f h ) , is required to be in the range of 0.8:16 to 1.8:16 in order to yield carbon spherules. The mixing ratio of the two organic precursors yielding carbon spherules can be estimated from the ratio R( f h ) , and can be adjusted to this range by adding either functional or hydrocarbon components.
Published Version
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