Paper Number
PO14 

Session
Poster Session

Title
Investigation of thermal transport in polymers using infrared thermography

Presentation Date and Time
October 8, 2014 (Wednesday) 6:05

Track / Room
Poster Session / Poster

Authors (Click on name to view author profile)

1. Nieto Simavilla, David (Illinois institute of technology, Chemical and biological engineering)
2. Venerus, David C. (Illinois institute of technology, Chemical and biological engineering)
3. Schieber, Jay D. (Illinois Institute of Yechnology, Chemical and Biological Engineering)

Author and Affiliation Lines (in printed abstract book)
David Nieto Simavilla, David C. Venerus, and Jay D. Schieber
Chemical and Biological Engineering, Illinois Institute of Yechnology, Chicago, IL 60616

Speaker / Presenter 
Nieto Simavilla, David

Text of Abstract
The anisotropic nature of thermal transport in flowing polymers plays an important role in the processing and the final properties of polymeric materials. In previous work we have investigated anisotropic thermal conductivity in polymers subjected to deformation using an optical technique based on Forced Rayleigh Scattering (FRS). This technique allows for the measurement of the components of the thermal conductivity tensor in different polymer systems under several types of deformations. We have found that there exists an apparently universal relationship between the thermal conductivity and stress tensors, known as the stress-thermal rule. More recently, we have developed a novel technique based on Infrared Thermography (IRT) that complements FRS and allows for the study of a wider range of polymeric materials. We validate IRT technique by comparing measurements of anisotropy in thermal conductivity on cross-linked networks against those obtained with FRS. Additionally, the study of transient IRT experiments allows us to investigate the heat capacity dependence on deformation. We find that heat capacity increases with stretch ratio in lightly cross-linked cis 1,4-polyisoprene specimens subjected to uniaxial extension. This deviation from the equilibrium value of heat capacity is consistent with an independent set of experiments comparing anisotropy in thermal diffusivity and conductivity employing FRS and IRT techniques.