2009
DOI: 10.1016/b978-0-08-054819-7.x0001-5
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Cited by 15 publications
(18 citation statements)
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“…The density of the polymer films was determined via the buoyancy method in room temperature deionized water (water uptake in the hydrophobic, glassy polymer films was negligible) using a Mettler Toledo Model ML204 density kit coupled to an analytical balance. Using data provided by the density measurements, fractional free volume (FFV) of the films was calculated using eq : where V 0 is the molar mass of the repeat unit divided by the film density (also referred to as the molar volume), and V w is the van der Waals volume, which is calculated via the Bondi group contribution method. …”
Section: Methodsmentioning
confidence: 99%
“…The density of the polymer films was determined via the buoyancy method in room temperature deionized water (water uptake in the hydrophobic, glassy polymer films was negligible) using a Mettler Toledo Model ML204 density kit coupled to an analytical balance. Using data provided by the density measurements, fractional free volume (FFV) of the films was calculated using eq : where V 0 is the molar mass of the repeat unit divided by the film density (also referred to as the molar volume), and V w is the van der Waals volume, which is calculated via the Bondi group contribution method. …”
Section: Methodsmentioning
confidence: 99%
“…This group contribution value closely agrees with a comparable estimate of approximately 1.5 nm obtained using molar volumes determined from monomer density properties. 14,15 Johnson et al reported a growth rate of approximately 1 nm/cycle, 10 and this result suggests that, in their process, the PA layer may not grow strictly orthogonally to the substrate, which would lead to a smaller increase in thickness per cycle compared to the estimated theoretical minimum thickness values.…”
Section: Growth Rate and Surface Roughnessmentioning
confidence: 97%
“…For our study on polyurethanes, the wavenumbers exhibited by CO and NH groups as well as the ratio of absorbance values of NH to CO groups for each sample, are of particular importance and will provide better correlation to mechanical responses. It has been observed before that the CO stretching vibration and NH stretching vibration show different wavenumbers depending on the degree of H-bonding as well as crosslinking occurring due to trifunctional hydroxyl group polyol which significantly impact mechanical properties of such polyurethanes (Tsai et al, 1998). It is expected that a particular amount or degree of these factors, h-bonding and crosslinking, which results in the optimal mechanical response suited to a particular end-user application.…”
Section: Hml Modelingmentioning
confidence: 99%