Abstract
The high temperature thermal behaviour of cyclic and linear poly(dimethylsiloxanes) (PDMS) have been investigated using differential scanning calorimetry and thermogravimetry. The cyclic and linear polymers were found to have similar thermal stabilities. They depolymerized at temperatures above 623 K, apparently by a common mechanism. The cyclic PDMS were sealed under vacuum in borosilicate glass or quartz ampoules and heated at temperatures greater than 623 K. Detailed chromatographic analyses of the products formed showed that these were consistent with ring opening polymerizations of the cyclic siloxanes (catalysed ionically by the surfaces of the vessels) and not with bond interchange reactions, as had previously been suggested.
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