1998
DOI: 10.1002/(sici)1099-0488(19980115)36:1<155::aid-polb17>3.0.co;2-b
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Interface effects on moisture absorption in ultrathin polyimide films

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Cited by 38 publications
(7 citation statements)
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“…Many authors have shown that in case of thin films the solvent retains at the film substrate interface for the polymers that are soluble in organic solvents. [31][32][33][34][35][36][37][38] Contrary to these results, our earlier study on swelling of polyacrylamide films suggests that water resides in the entire film and concentration of the same increases towards the top layer 23 and the present shrinkage data are in agreement with our earlier observation.…”
Section: Resultssupporting
confidence: 90%
“…Many authors have shown that in case of thin films the solvent retains at the film substrate interface for the polymers that are soluble in organic solvents. [31][32][33][34][35][36][37][38] Contrary to these results, our earlier study on swelling of polyacrylamide films suggests that water resides in the entire film and concentration of the same increases towards the top layer 23 and the present shrinkage data are in agreement with our earlier observation.…”
Section: Resultssupporting
confidence: 90%
“…Segregation of solvent at the polymer/substrate interface of supported polymer films has already been observed in absorption experiments in which the films are put in the presence of the solvent vapor [21][22][23][24][25]42]. It was attributed to the preferential interaction of the solvent with the substrate [25].…”
Section: Thickness Dependencementioning
confidence: 99%
“…Some of the results mentioned above suggest that the solvent could be segregated at the polymer/substrate interface [19,20]. Water absorbed in films of different polymers has also been shown to be located at the polymer/substrate interface [21][22][23][24][25]. Another relevant question is the dependence of the amount of retained solvent with the film thickness.…”
mentioning
confidence: 99%
“…Because, in this case, the stoichiometry of the PI is the same for all samples (BPDA/PPD normalC22normalH10normalN2normalO4), the reason for such phenomena may reside on the swelling mechanism due to the absorbed water that fills the free space within the polymer. Considering that the spin coating manufacturing process of PI determines different in-plane and out-of-plane strains during swelling, 39 it is reasonable to expect that this anisotropy would increase for thinner films. In Ref.…”
Section: Resultsmentioning
confidence: 99%