Paper Number
SM17 

Session
Polymer Solutions and Melts

Title
Fingerprinting the non-linear response of a polystyrene solution: Comparison of strain controlled and stress controlled mechanical spectral hole burning

Presentation Date and Time
October 13, 2015 (Tuesday) 10:25

Track / Room
Track 2 / Constellation D

Authors (Click on name to view author profile)

1. Qian, Zhiyuan (Texas Tech University, Chemical Engineering)
2. McKenna, Gregory B. (Texas Tech University, Chemical Engineering)

Author and Affiliation Lines (in printed abstract book)
Zhiyuan Qian and Gregory B. McKenna
Chemical Engineering, Texas Tech University, Lubbock, TX 79409

Speaker / Presenter 
Qian, Zhiyuan

Text of Abstract
It is well known that large amplitude oscillatory shear (LAOS) has become a powerful tool to fingerprint the nonlinear response of polymers and other complex fluids. In a recent work, Shamim and McKenna [J. Rheol. 58(1), 43-62, 2014] used the strain controlled mechanical spectral hole burning (MSHB) which was developed in our labs, to expand the fingerprinting Lissajous-Bowditch (LB) loop and Fourier transform rheology (FTR) method to characterize the nonlinearity of linear polystyrene solution. They observed a linear relationship between the horizontal hole intensity and the square of pump strain amplitude. A similar quadratic dependence was found for the third harmonics from FTR. However, the origins are not same for these two signatures. In the current work, we address the hole burning spectroscopy by using stress controlled MSHB and the compare the results with the strain controlled method. In addition, a comparison will be made among the methods in order to build more complete fingerprint of the non-linear response.

The authors are thankful to the American Chemical Society, Petroleum Research Fund 53205-ND7, for the support of this project.