Diffusion of methyl ethyl ketone in polysiobutylene: Comparison of spectroscopic and gravimetric techniques

Unified Dual Mode Description of Small Molecule Sorption and Desorption Kinetics in a Glassy Polymer

“…One of the early studies from our group using FTIR-ATR spectroscopy was a comparison of the technique with gravimetry using the system methyl ethyl ketone in polyisobutylene. 2 We showed that the diffusion coefficients obtained from FTIR-ATR spectroscopy were well within experimental error of those measured gravimetrically. Put another way, which will be relevant to the current study, diffusion coefficients obtained spectroscopically could be used to predict gravimetric results and vice versa.…”

“…It is clear that the time delay in the spectroscopic data is longer than expected and cannot be captured by a simple Fickian model. This is in contrast with rubbery polymers in which the time delay is readily captured, and a simple Fickian model can describe both gravimetric and spectroscopic data well with the same value of D …”

“…Most of the previous studies using this spectroscopic approach have been with rubbery polymers because these materials adhere well to the ATR crystal, a requirement for obtaining reliable and reproducible data. One of the early studies from our group using FTIR-ATR spectroscopy was a comparison of the technique with gravimetry using the system methyl ethyl ketone in polyisobutylene . We showed that the diffusion coefficients obtained from FTIR-ATR spectroscopy were well within experimental error of those measured gravimetrically.…”

Fourier transform infrared/attenuated total reflectance analysis of water diffusion in poly[styrene‐b‐isobutylene‐ b‐styrene] block copolymer membranes

“…In addition to the ability to count molecules in time on the basis of chemical group identification, this experiment can be conducted with relative ease. D values obtained by the FTIR–ATR method have correlated very well with those obtained from gravimetric sorption experiments 9…”

Quantitative Analysis of Polymer Dilation during Sorption Using FTIR-ATR Spectroscopy

“…One point that deserves to be emphasized is the good agreement between the diffusion results obtained with both techniques. Other studies in the literature have compared results from these two methods for a rubbery polymer, where the gravimetric technique was used primarily to test the reliability of ATR data . The results here extend the comparison to glassy polymers.…”