Viscosity of ring polymer melts

Rossana Pasquino, Thodoris C. Vasilakopoulos, Youn Cheol Jeong, Hyojoon Lee, Simon Rogers, George Sakellariou, Jürgen Allgaier, Atsushi Takano, Ana R. Brás, Taihyun Chang, Sebastian Gooßen, Wim Pyckhout-Hintzen, Andreas Wischnewski, Nikos Hadjichristidis, Dieter Richter, Michael Rubinstein, Dimitris Vlassopoulos

Research output: Contribution to journalArticlepeer-review


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,linear0,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,linear0,ring ∼ Z 1.2±0.3, is weaker than the scaling prediction (η0,linear0,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.

Original languageEnglish (US)
Pages (from-to)874-878
Number of pages5
JournalACS Macro Letters
Issue number10
StatePublished - Oct 15 2013
Externally publishedYes

ASJC Scopus subject areas

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


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