Chain degradation in rheological measurements and effects of molecular weight distributions on rheological data for polymer solutions undergoing flow-induced phase separation

Yoshiaki Takahashi, Nobuo Ochiai, Masaki Yanagida, Shinichi Kitade, Ichiro Noda

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3 Citations (Scopus)


We examined chain degradation in Theological measurements and the effects of molecular weight distributions (MWDs) on rheological data at steady states for polystyrenes in dioctyl phthalate undergoing flow-induced phase separation. The chain degradation occurred when we observed a strong overshoot in transient stresses. The suppression of overshoot by lowering the concentration and the molecular weights of the samples, and/or by making a step increase in the shear rate, was effective in preventing the degradation. The most significant difference between the rheological data for samples with broad and narrow MWDs is the existence of plateau in the first normal stress difference in the former. Shear rate dependences of the stresses of broad MWD samples in the shear rate range before the plateau are somewhat steeper than those of narrow MWD samples.

Original languageEnglish
Pages (from-to)4313-4317
Number of pages5
Issue number18
Publication statusPublished - Aug 1998
Externally publishedYes


All Science Journal Classification (ASJC) codes

  • Organic Chemistry
  • Polymers and Plastics
  • Materials Chemistry

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