A new non-linear parameter Q from FT-Rheology under nonlinear dynamic oscillatory shear for polymer melts system

作者：Hyun Kyu^*; Kim Wonho

来源：Korea-Australia Rheology Journal, 2011, 23(4): 227-235.

DOI：10.1007/s13367-011-0028-0

• LAOS test
• FT-Rheology
• nonlinear parameter Q
• zero-strain nonlinearity Q(0)
• polymer melt
• polymer composite

Large Amplitude Oscillatory Shear (LAOS) is a test method for the characterization of complex fluids. Varying independently both strain amplitude (gamma(0)) and frequency (omega) allows covering a broad spectrum of rheological responses with respect to time scales and involved non-linearity. Moreover, it is experimentally relatively simple to generate LAOS flow, because dynamic oscillatory shear does not involve any sudden jump in either strain or strain rate. There are several methods to analyze the resulting torque data received from the LAOS test protocol: (1) the G' and GaEuro(3) as a function of strain amplitude (2) Stress shape (stress vs. time) or Lissajous pattern (stress vs. strain or stress vs. strain rate) (3) Fourier transform (4) generalized "storage" and "loss" modulus when decomposing the nonlinear stress data (5) Chebyschev polynomials using decomposing stress data and further development of Chebyschev polynomials. The Fourier Transform (FT)-Rheology is perhaps the most sensitive method of those discussed above. A new nonlinear parameter Q established from FT-Rheolgy under LAOS flow, i.e. Q(omega,gamma (0)) a parts per thousand I (3/1)/gamma (0) (2) , as well as the zero-strain nonlinearity or intrinsic nonlinearity Q(omega,gamma (0)) = gamma(-> 0)Q(omega, gamma(0)) = kim by Hyun and Wilhelm (2009). In this study, therefore recent experiment and simulation results of nonlinear parameter Q from FT-Rheology for polymer melt and polymer composite systemsare reviewed.

• 出版日期2011-12