Interface effects on moisture absorption in ultrathin polyimide films

Tan, Nora C. Beck; Wu, Wen‐Li; Wallace, W.E.; Davis, G. T.

doi:10.1002/(sici)1099-0488(19980115)36:1<155::aid-polb17>3.0.co;2-b

Cited by 38 publications

(7 citation statements)

References 1 publication

(2 reference 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%

Study of Thickness Dependent Density in Ultrathin Water Soluble Polymer Films

Mondal¹,

Mukherjee²,

Kawashima³

et al. 2009

Macromolecules

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Density of the polyacrylamide ultrathin films has been studied using X-ray reflectivity technique. Two sources (one powder and another aqueous solution) of polyacrylamide were used to prepare spin coated films on silicon substrate. Light scattering measurements show that the polymer chains were unentangled in a concentrated (4 mg/ml) as well as in a dilute (2 mg/ml) solution prepared from the powder, whereas the solution (4 mg/ml) prepared by diluting the solution source shows entangled chain morphology. Three sets of films of different thicknesses were prepared using the three solutions by spin coating on silicon substrates. Comparison of X-ray reflectivity data for as prepared and dry films reveals that the shrinkage of the films decreases with increasing thickness. Average electron densities of the films were found to follow a trend of higher density for thinner films with a maximum increase of about 12% compared to the bulk. The densities of all the films irrespective of the nature of entanglement and concentration of their source were found to increase with spin speed of coating and attain saturation at higher speed. Absence of correlation between shrinkage and density data and the fact that the densities of all the films follow a master curve irrespective of their origin suggest that the higher density of the films result from the higher orientation of chains as a consequence of an interplay between stretching and stronger attractive interactions of polar nature.

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Section: Resultssupporting

confidence: 90%

Study of Thickness Dependent Density in Ultrathin Water Soluble Polymer Films

Mondal¹,

Mukherjee²,

Kawashima³

et al. 2009

Macromolecules

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show abstract

“…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%

Solvent retention in thin polymer films studied by gas chromatography

Garcia-Turiel

Jérôme

2007

Colloid Polym Sci

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Thin polystyrene films were produced by spin coating from solutions in toluene. The amount of solvent retained in the films after drying for different times was measured using gas chromatography. Whereas for thicker films (thickness > 200 nm), the relative amount of solvent in the films is less than a few percent, the proportion of toluene increases significantly in thinner films. The thickness dependence of the mass of retained solvent shows that the solvent is mainly retained at the polymer-substrate interface. The solvent desorption rate exhibits no variation on the film thickness.

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“…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%

Elastic characterization of nanometer-thick polymeric film for astrophysics application with an experimental-numerical method

Montinaro,

Lo Cicero,

D’Anca

et al. 2023

J. Astron. Telesc. Instrum. Syst.

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The x-ray detectors on board astrophysics space missions require optical blocking filters that are highly transparent to x-rays. The filter design typically consists of a polymeric film that is a few tens of nanometers thick coated with aluminium. Due to the large size of the filter membrane (from a few tens to a few hundred square centimeters) and the extreme aspect ratio, together with severe loading conditions during launch and different stoichiometries of the polymer that could change its mechanical properties, a characterization study of the employed material is needed. The plane strain bulge test is a well-accepted methodology for the mechanical testing of structures that are less than a micrometer thick, and especially for freestanding membranes. Unfortunately, testing such ultra-thin films is not a simple task due to residual stress and experimental uncertainty at very low pressure. In this work, the elastic properties of an extremely thin (between 45 and 415 nm) membrane made of bare polyimide and coated with aluminium were derived through adopting a combined experimental-numerical methodology based on the bulge test and numerical simulations.

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Interface effects on moisture absorption in ultrathin polyimide films

Cited by 38 publications

References 1 publication

Study of Thickness Dependent Density in Ultrathin Water Soluble Polymer Films

Study of Thickness Dependent Density in Ultrathin Water Soluble Polymer Films

Solvent retention in thin polymer films studied by gas chromatography

Elastic characterization of nanometer-thick polymeric film for astrophysics application with an experimental-numerical method

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