![]() DNA solutions are now used routinely as model polymeric systems due to their near-perfect monodispersity. In this work, the extensional rheology of linear, double-stranded DNA molecules, spanning an order of magnitude of molecular weights (25-289 kilobasepairs) and concentrations (0.03-0.3 mg/ml), has been investigated. This difference in behaviour is anticipated to be even more pronounced in extensional flows, which play a critical role in a number of industrial contexts such as fiber spinning and ink-jet printing. Previous experimental studies of the shear rheology of semidilute polymer solutions have demonstrated that their behaviour is distinctively different from that observed in the dilute and concentrated regimes. However, a systematic study of the extensional rheology of polymer solutions in the semidilute regime, in terms of examining the effects of concentration and molecular weight, has not been carried out so far. The extensional rheology of polymer melts and dilute polymer solutions has been extensively examined through experiments and theoretical predictions.
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