Paper Number
PO105 

Session
Poster Session

Title
Nano-rheological measurements of ultrathin amorphous fluoropolymer films

Presentation Date and Time
October 17, 2018 (Wednesday) 6:30

Track / Room
Poster Session / Woodway II/III

Authors (Click on name to view author profile)

1. El Banna, Amer A. (Texas Tech University, Department of Chemical Engineering)
2. McKenna, Gregory B. (Texas Tech University, Department of Chemical Engineering)

Author and Affiliation Lines (in printed abstract book)
Amer A. El Banna and Gregory B. McKenna
Department of Chemical Engineering, Texas Tech University, Lubbock, TX 79409-4121

Speaker / Presenter 
El Banna, Amer A.

Text of Abstract
We use vacuum pyrolysis deposition to produce thin ultra-stable Teflon films. We compare confinement effects and viscoelastic properties of ultra-stable films with their rejuvenated films. The viscoelastic response of freely standing Teflon films were characterized using the novel bubble inflation technique [P. A. O’Connell and G. B. McKenna, Science 307, 1760-1763 (2005)] on films ranging from 30 - 275 nm and over a temperature range of Tg(macroscopic)-15? to Tg(macroscopic)+20?. Imaging capabilities of the atomic force microscope were used to capture the bubble geometry's time evolution. Time-temperature superposition, time-thickness superposition and rubbery stiffening are to be discussed.