Physics – Condensed Matter – Soft Condensed Matter
Scientific paper
2010-10-28
Polymer, Volume 51, Issue 23, 29 October 2010, Pages 5550-5555
Physics
Condensed Matter
Soft Condensed Matter
26 pages, 7 figures
Scientific paper
10.1016/j.polymer.2010.09.045
The structural aspects of polyacrylamide thin films annealed at degradation threshold temperature have been studied as a function of annealing time using in situ X-ray reflectivity technique in vacuum. We observe significant decrease of thickness and increase of density with annealing time for all the films. The dynamical behavior of the changes was modeled in terms of two distinct exponential decay functions, following our earlier observation of two different time scales for the chemical modification pathways, and was found to be in excellent agreement with the data. The diffusion coefficients of the polymer chains corresponding to the two modes are found to be different by an order of magnitude. It was found that the two dynamical modes correspond to the formation of two degradation products at two different rates. The larger time constants for both the modes in case of thickness reduction compare to the chemical changes was explained in terms of inter-chain entanglement and attachment of the polymer with the substrate.
Mondal Mojammel H.
Mukherjee Manabendra
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