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Statistical Links
Length of freely rotating section varies with chain flexibility…about 7 carbon bonds for NR, less for silicone, more for most other elastomers
High flexibility correlates mainly with rotatability of bonds in the main chain.
Oxygen links in the main chain, as in VMQ, FVMQ, CO, ECO, and perfluoropolyethers (e.g. Sifel) lead to low hysteresis elastomers with relatively short freely rotating segments.