Development of the methods for prediction of gas permeation parameters of glassy polymers: polyimides as alternating co-polymers

Prediction of gas permeability coefficients of copolyimides by group contribution methods

“…Apart from the work of Alentiev et al [5] which estimates the transport properties of about 500 different homopolyimides, we have not found any other study that uses group contribution methods for screening of homopolyimides.…”

“…There is also the group contribution method of Alentiev et al [5] developed specifically to predict the permeability coefficients of polyimides using a database including about 120 polyimides prepared from 9 dianhydrides and 70 diamines. These methods have been tested for several polyimide structures, but no predictive studies for copolyimides have been reported.…”

Modelling of gas permeability for membranes prepared by PECVD

“…This assumption has important implications like the consideration that the value of V f and FFV are not function of the gas-polymer interaction (see Eqs. (9) and (10)). Consequently, our model predicts a linear relation between ln(P i ) and ln(P j ), similar to Alentiev and Yamplorskii [3].…”

“…The pre-requisite for this is that N n, where n is the number of different groups that are used to draw the structures of repeat units of all N polymers. Altentiev et al [9] found the following correlation for the polyimides alternating co-polymers:…”

A Review of Carbon Dioxide Selective Membranes: A Topical Report

“…Unfortunately, their study was only limited to the O 2 /N 2 and He/N 2 gas pairs. Alentiev et al [161] also used the group contribution method for prediction of gas permeation parameters (permeability and diffusion coefficients) of glassy polymers. They deduced the group contributions from a database, including about 120 polyimides prepared from nine different dianhydrides, and about 70 diamines.…”