Viscosity of ring polymer melts

Rossana Pasquino, Thodoris C. Vasilakopoulos, Youncheol Jeong, Hyojoon Lee, Simon A. Rogers, Georgios Sakellariou, Jürgen B. Allgaier, Atsushi Takano, Ana Rita E Brás, Taihyun Chang, Sebastian Gooßen, Wim Pyckhout-Hintzen, Andreas Wischnewski, Nikos Hadjichristidis, Dieter R. Richter, Michael H. Rubinstein, Dimitris Vlassopoulos

Research output: Contribution to journalArticlepeer-review

129 Scopus citations


We have measured the linear rheology of critically purified ring polyisoprenes, polystyrenes, and polyethyleneoxides of different molar masses. The ratio of the zero-shear viscosities of linear polymer melts η0,linear to their ring counterparts η0,ring at isofrictional conditions is discussed as a function of the number of entanglements Z. In the unentangled regime η0,linear/η 0,ring is virtually constant, consistent with the earlier data, atomistic simulations, and the theoretical expectation η0,linear/ η0,ring = 2. In the entanglement regime, the Z-dependence of ring viscosity is much weaker than that of linear polymers, in qualitative agreement with predictions from scaling theory and simulations. The power-law extracted from the available experimental data in the rather limited range 1 < Z < 20, η0,linear/η0,ring ∼ Z 1.2±0.3, is weaker than the scaling prediction (η0,linear/η0,ring ∼ Z 1.6±0.3) and the simulations (η0,linear/ η0,ring ∼ Z2.0±0.3). Nevertheless, the present collection of state-of-the-art experimental data unambiguously demonstrates that rings exhibit a universal trend clearly departing from that of their linear counterparts, and hence it represents a major step toward resolving a 30-year-old problem. © 2013 American Chemical Society.
Original languageEnglish (US)
Pages (from-to)874-878
Number of pages5
JournalACS Macro Letters
Issue number10
StatePublished - Sep 17 2013

ASJC Scopus subject areas

  • Inorganic Chemistry
  • Organic Chemistry
  • Materials Chemistry
  • Polymers and Plastics


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