Abstract
The thermal stability of poly(dicyclopentadiene), made with RuCl 2( p-cymene)(PCy 3) as initiator, was investigated by ageing 2 and 5 mm plates up to 1 year at 180°C in air, or 360 h in a weather-o-meter. The surface roughness and microhardness of unstabilized and stabilized (0.1% Irganox® 1520, 0.5% Tinuvin® 171) probes were determined. Stabilization leads to an overall softer material but with a harder surface oxide layer with finer cracks, limiting the oxygen diffusion rate into the material and therefore protecting the underlaying material from fast oxidation. This is further supported by chemiluminescence (CL) measurements of 50 and 150 μm films of poly(DCPD) under strong oxidative conditions (150°C in pure O 2). It was found that even the unstabilized material is extremely resistant to oxidation, far superior to saturated poly( α-olefins) like poly(propylene). Pyrolysis of poly(DCPD) and poly(cyclooctene) (Vestenamer®) at 670°C under an inert atmosphere gave mixtures of cyclic and open-chain unsaturated hydrocarbons. Surprisingly, the pyrolysis of poly(norbornene) (Norsorex®) gives squalene in >90% yield.
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