Physics – Condensed Matter – Soft Condensed Matter
Scientific paper
2009-04-13
Macromolecules, 2008, 41 (22), 8753-8758
Physics
Condensed Matter
Soft Condensed Matter
8 figures
Scientific paper
10.1021/ma801622h
The effect of annealing on the dynamical behavior of swelling for ultrathin polyacrylamide films deposited on silicon substrates have been studied using X-ray reflectivity technique. The spin coated polyacrylamide films of similar thicknesses were annealed at various temperatures below and above the glass transition temperature of the polymer. The electron density of the films was found to increase systematically on annealing. The swelling dynamics of the annealed films were found to have systematic dependence on the temperature of annealing. The interaction between the substrate and the polymer molecules was found to play important role in the swelling dynamics of the annealed films unlike our earlier observation with as coated films. The chain segments attached directly to the substrate were believed to have restricted freedom of movements compared to the ones that are at a distance from the substrate and relatively free. Accordingly, the dynamical behavior of swelling was modeled in terms of the combination of a free and a restricted component and was found to be in excellent agreement with the data. The diffusion coefficients corresponding to the restricted polymer segments were an order of magnitude smaller than those of the free segments and the fraction of the same was found to increase with annealing at higher temperatures. The overall reduction of swellability of the films was explained in terms of the increase of density of the films and the segmental attachment to the substrate on annealing.
Mondal Mojammel H.
Mukherjee Manabendra
No associations
LandOfFree
Effect of Annealing Induced Polymer Substrate Attachment on Swelling Dynamics of Ultrathin Polymer Films does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Effect of Annealing Induced Polymer Substrate Attachment on Swelling Dynamics of Ultrathin Polymer Films, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Effect of Annealing Induced Polymer Substrate Attachment on Swelling Dynamics of Ultrathin Polymer Films will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-324288