Thermally Activated Processes in Polymer Glasses
V. Parihar, D. Drosdoff, A. Widom, Y.N. Srivastava
TL;DR
This paper derives the Vogel-Fulcher-Tammann law for polymer glasses, considering microscopic polymer chain entropy, and explains boundary effects in thin films that modify this law.
Contribution
It provides a microscopic derivation of the Vogel-Fulcher-Tammann law for bulk polymers and analyzes boundary effects in thin film polymers.
Findings
Vogel-Fulcher-Tammann law applies to bulk polymers.
Boundary surfaces in thin films alter the thermal activation behavior.
Modified activation law near thin film boundaries.
Abstract
A derivation is given for the Vogel-Fulcher-Tammann thermal activation law for the glassy state of a bulk polymer. Our microscopic considerations involve the entropy of closed polymer molecular chains (i.e. polymer closed strings). For thin film polymer glasses, one obtains open polymer strings in that the boundary surfaces serve as possible string endpoint locations. The Vogel-Fulcher-Tammann thermal activation law thereby holds true for a bulk polymer glass but is modified in the neighborhood of the boundaries of thin film polymers.
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Taxonomy
TopicsMaterial Dynamics and Properties · Thermal and Kinetic Analysis · Glass properties and applications