Abstract
The outdoor ageing of poly(1-trimethylsilyl)-1-propyne (PTMSP) membranes has been studied mainly by means of differential scanning calorimetry (DSC), thermogravimetry, viscosimetry and infra-red spectroscopy. Membranes lose their integrity within 288 h of exposure. After exposure for 192 h the oxidation time at 523 K decreases from 25 to 0.5 min, while the starting temperature of degradation, as measured by DSC, changes from 543 K to 393 K and the viscosimetric molecular weight decreases five times. The high speed of the photodegradation process can be accounted for by the high oxygen solubility of this polymer.
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