The linear rheological responses of wedge-type polymers

Miao Hu, Yan Xia, Christopher S. Daeffler, Jinhua Wang, Gregory B. McKenna, Julia A. Kornfield, Robert H. Grubbs

Research output: Contribution to journalArticlepeer-review

12 Scopus citations

Abstract

The linear rheological responses of a series of specially designed wedge-type polymers synthesized by the polymerization of large molecular weight monomers have been measured. These wedge polymers contained large side groups which contained three flexible branch chains per polymer chain unit. The master curves for these polymers were obtained by time temperature superposition of dynamic data at different temperatures from the terminal flow regime to well below the glass transition temperature, Tg. While these polymers maintained a behavior similar to that of linear polymers, the influence of the large side group structure lead to low entanglement densities and extremely low rubbery plateau modulus values, being near to 13 kPa. The viscosity molecular weight dependence was also somewhat higher than that normally observed for linear polymers, tending toward a power law near to 4.2 rather than the typical 3.4 found in entangled linear chains. The glassy modulus of these branched polymers is also found to be extremely low, being less than 100 MPa at Tg -60 °C.

Original languageEnglish
Pages (from-to)899-906
Number of pages8
JournalJournal of Polymer Science, Part B: Polymer Physics
Volume53
Issue number13
DOIs
StatePublished - Jul 1 2015

Keywords

  • branched
  • glassy polymers
  • macromonomers
  • rheology
  • viscoelastic properties
  • viscosity

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