Paper Number
PO64 

Session
Poster Session

Title
Nonlinear uniaxial extension behavior of polyisoprene melts: Polymer melts and mixtures

Presentation Date and Time
February 15, 2017 (Wednesday) 6:00

Track / Room
Poster Session / Foyer-Stairs/Windows

Authors (Click on name to view author profile)

1. Liu, Jianning (University of Akron)
2. Feng, Yi (University of Akron)
3. Misichronis, Konstantinos (University of Tennessee)
4. Ntetsikas, Konstantinos (University of Ioannina)
5. Mays, Jimmy (University of Tennessee)
6. Avgeropoulos, Apostolos (University of Ioannina)
7. Wang, Shi-Qing (University of Akorn)

Author and Affiliation Lines (in printed abstract book)
Jianning Liu¹, Yi Feng¹, Konstantinos Misichronis², Konstantinos Ntetsikas³, Jimmy Mays², Apostolos Avgeropoulos³, and Shi-Qing Wang^1
1University of Akron, Akron, OH 44325; ²University of Tennessee, Knoxville, TN; ³University of Ioannina, Ioannina, Greece

Speaker / Presenter 
Liu, Jianning

Text of Abstract
Based on linear polyisoprene (PI) melts of different molecular weights and their mixtures, we explore nonlinear responses to melt stretching including startup and step extension, as a function of molecular weight and mixture composition. For example, we show in the limit of no chain stretching, i.e., Rouse-Weissenberg number WiR << 1, homogeneous extension is terminated by tensile decohesion, contrary to the literature assertion that such entangled melts and melts can attain steady flow. By comparison between mixtures and monodisperse melts we indicate how the entanglement structure influences the characteristics such as yielding and melt rupture.

This work is supported, in part, by National Science Foundation (DMR-1105135).