Viscoelastic Properties of Tightly Entangled Semiflexible Polymer Solutions
journal contributionposted on 21.11.2018, 00:00 by Yuki Okada, Yuka Goto, Reina Tanaka, Takuya Katashima, Xinyue Jiang, Ken Terao, Takahiro Sato, Tadashi Inoue
The dynamic viscoelasticity and birefringence of well-characterized semiflexible polymer solutionscellulose tris(phenyl carbamate)/tricresyl phosphate solutionswere investigated over a wide concentration region ranging from a dilute to a tightly entangled regime where the entanglement spacing is smaller than the Kuhn segment size. The stress optical rule did not hold true in the tightly entangled regime, indicating that the molecular origin of stress is not simply attributed to the orientation of segments but to the bending of chains, which does not contribute to birefringence significantly. At high frequencies, the power law behavior with the exponent 3/4 due to the tension stress was observed for the complex shear moduli at all the concentrations.