Flexibility and reptation Whether a polymer is flexible or not depends on the scale of interest. For example, the persistence length of double-stranded DNA is about 50 nm. Looking at length scale smaller than 50 nm, it behaves more or less like a rigid rod.G.McGuinness, Polymer Physics, Oxford University Press, p347 At length scale much larger than 50 nm, it behaves like a flexible chain.
Flexibility and reptation Whether a polymer is flexible or not depends on the scale of interest. For example, the persistence length of double-stranded DNA is about 50 nm. Looking at length scale smaller than 50 nm it behaves more or less like a rigid rod.G.McGuinness, Polymer Physics, Oxford University Press, p347 At length scale much larger than 50 nm, it behaves like a flexible chain.