Paper Number
ET18
Session
Advanced Experimental Techniques/Methods in Rheology
Title
Novel use of the van Gurp-Palmen Plot: New insights into polymer dynamics
Presentation Date and Time
October 17, 2018 (Wednesday) 11:30
Track / Room
Track 5 / San Felipe Room
Authors
- Qian, Zhiyuan (Texas Tech University, Chemical Engineering)
- McKenna, Gregory B. (Texas Tech University, Department of Chemical Engineering)
Author and Affiliation Lines
Zhiyuan Qian and Gregory B. McKenna
Department of Chemical Engineering, Texas Tech University, Lubbock, TX 79409
Speaker / Presenter
McKenna, Gregory B.
Text of Abstract
The van Gurp-Palmen plot (vGP) [van Gurp, M. and Palmen, J., Rheology Bulletin, 1998, 67, 5-8.] was originally proposed to verify the validity of Time-Temperature Superposition. It was found to be sensitive to polymer molecular weight, polydispersity, and structure. In the current work, a novel use of the vGP plot is proposed after reexamination of the vGP plot by compiling literature data for polymer melts with different topological structures: linear (pure and blend), ring, comb, and bottlebrush. A new parameter: the reciprocal of complex modulus at the first minimum moving from the terminal regime is defined and compared with the steady-state recoverable compliance. Results show that these two paramters while related to each other, as they follow similar dependences on the molecular weight, weight fraction of high molecular weight content and backbone concentration, there are also differences. The work we shown here expands the application of vGP plot and provides new insights into understanding polymer dynamics.