Document Type
Thesis
Date of Award
Spring 5-31-1998
Degree Name
Master of Science in Chemical Engineering - (M.S.)
Department
Chemical Engineering, Chemistry and Environmental Science
First Advisor
Marino Xanthos
Second Advisor
Ulku Yilmazer
Third Advisor
Piero M. Armenante
Abstract
Intrinsic viscosity (IV) has often been misused for estimating both melt viscosity and elasticity of poly(ethylene terephthalate) (PET). A rheological study was conducted to determine the variations between a virgin unmodified PET and a recycled and chemically modified PET, both having a reported nominal IV of 0.95.
The modified material had a larger melt viscosity (capillary and dynamic) than the virgin material (by an average of 61%). The extrudate swell, a better indicator of melt elasticity, of the modified was more than 110% greater than that of the unmodified material. Activation energies for melt viscosity and extrudate swell were found to be approximately 20 KJ/mol and 3 kJ/mol respectively, for the unmodified material at high shear rates. The melt viscosity for both materials was found to be best fitted by the Cross Model using a least-squares fit.
Recommended Citation
Quintans, Jorge, "Rheological characterization of unmodified and chemically modified poly (ethylene terephthalate) resins" (1998). Theses. 952.
https://digitalcommons.njit.edu/theses/952
