The time dependent rheo-mechanical properties of a class of associating polymers (amine-functionalized polyolefins) are investigated using rheology, differential scanning calorimetry (DSC), infrared microscopy, and small-angle x-ray scattering (SAXS) measurement. The modulus of the sample increases with time and temperature as determined by shear rheology. With higher temperature and longer equilibration time, there is a gradual decrease in the power-law scaling of storage and loss moduli in the terminal flow region and the emergence of an additional low-frequency plateau in the storage modulus. The aging behavior at different temperatures is found to be correlated with the horizontal shift factors obtained from the time-temperature superposition. With increasing aging time, there is an increase in the glass transition temperatures (DSC), and a continuous red shift in the associated amine stretching peak (Fourier-transform infrared). SAXS also shows the emergence of a dominant microstructure after aging of the sample for a long time. Based on the characterization results, an underlying microscopic origin of the aging process is proposed.
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November 2024
Research Article|
October 09 2024
Rheology and aging of amine functionalized polyolefins
Z. Zhang
;
Z. Zhang
1
Department of Chemical and Biological Engineering, University of British Columbia
, Vancouver, British Columbia V6T 1Z3, Canada
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B. M. Yavitt;
B. M. Yavitt
2
Department of Chemical and Environmental Engineering
, University of Cincinnati, Cincinnati, Ohio 45221
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E. Mohammadi
;
E. Mohammadi
3
Department of Chemistry, University of British Columbia
, Vancouver, British Columbia V6T 1Z4, Canada
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L. L. Schafer
;
L. L. Schafer
3
Department of Chemistry, University of British Columbia
, Vancouver, British Columbia V6T 1Z4, Canada
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S. G. Hatzikiriakos
S. G. Hatzikiriakos
a)
1
Department of Chemical and Biological Engineering, University of British Columbia
, Vancouver, British Columbia V6T 1Z3, Canada
a)Author to whom correspondence should be addressed; electronic mail: savvas.hatzi@ubc.ca
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a)Author to whom correspondence should be addressed; electronic mail: savvas.hatzi@ubc.ca
J. Rheol. 68, 933–947 (2024)
Article history
Received:
June 22 2024
Accepted:
September 19 2024
Connected Content
A companion article has been published:
Predicting properties of aminated associated polymers as they age
Citation
Z. Zhang, B. M. Yavitt, E. Mohammadi, L. L. Schafer, S. G. Hatzikiriakos; Rheology and aging of amine functionalized polyolefins. J. Rheol. 1 November 2024; 68 (6): 933–947. https://doi.org/10.1122/8.0000895
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