화학공학소재연구정보센터
홈 로그인 로그아웃 연락처 사이트맵
Korea-Australia Rheology Journal, Vol.30, No.1, 1-10, February, 2018
DOI10.1007/s13367-018-0001-2  Export Citation
First-harmonic nonlinearities can predict unseen third-harmonics in medium-amplitude oscillatory shear (MAOS)
Olivia Carey-De La Torre, and Randy H. Ewoldt1, †
  • Department of Mechanical Science and Engineering, University of Illinois at Urbana-Champaign, Urbana 61801, USA
  • 1Department of Mechanical Science and Engineering and Frederick Seitz Materials Research Laboratory, University of Illinois at Urbana Champaign, Urbana 61801, USA
E-mail:
We use first-harmonic MAOS nonlinearities from G'1 and G"1 to test a predictive structure-rheology modelfor a transient polymer network. Using experiments with PVA-Borax (polyvinyl alcohol cross-linked by sodium tetraborate (borax)) at 11 different compositions, the model is calibrated to first-harmonic MAOS data on a torque-controlled rheometer at a fixed frequency, and used to predict third-harmonic MAOS on a displacement controlled rheometer at a different frequency three times larger. The prediction matches experiments for decomposed MAOS measures [e3] and [v3] with median disagreement of 13% and 25%, respectively, across all 11 compositions tested. This supports the validity of this model, and demonstrates the value of using all four MAOS signatures to understand and test structure-rheology relations for complex fluids.
Keywords:large-amplitude oscillatory shear;LAOS;MAOS;supramolecular;polymer network;constitutive model testing;prediction;experimental methods;parameter calibration
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