Silicones are chemically inert and have no affinity to other substances. Their most important advantage is their very good thermal stability and a viscosity that varies only slightly over a wide temperature range and the silicone backbone is stronger than the carbon-to-carbon chain, making it more resistant to temperature, radiation, oxidation and many chemicals.
Hydrocarbons are primarily methylene (CH2) and methyl (CH3) is even more apolar, so the high methyl density of silicones makes them literally ‘oilier than oil’ – they can be surface active even in oils and can ‘reach places’ (e.g. surface tension reduction) that hydrocarbons cannot. Due to their high methyl density, silicones have very low intermolecular association.
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