Effect of nanodiamond additives on the structure and gas‐transport properties of a poly(phenylene–isophtalamide) matrix

Abstract

Nanodiamonds (NDs) are specific carbon nanoparticles approximately 5 nm in diameter with a large and accessible surface containing functional groups. Poly(phenylene-isophtalamide) (PA)-ND composites were prepared by solid-phase dispersal and used for dense film formation. The PA-ND composites were analyzed by Fourier transform infrared spectroscopy. The membrane structure was determined on the basis of density measurement and morphological study by atomic force microscopy. The gastransport properties were measured over a wide range of temperatures from 30 to 100 8C for the following series of penetrants: H 2 , N 2 , O 2 , and CO 2 . The experimental data of gas permeability were compared with the permeability values calculated from Maxwell's model. Data on the permeability and diffusion coefficients were used to calculate the activation energies. V C 2018 Wiley Periodicals, Inc. J.Appl. Polym. Sci. 2018, 135, 46320.

Impact of Endometallofullerene on P84 Copolyimide Transport and Thermomechanical Properties

“…The transport properties of the P84/Fe@C 60 (0.5%) membrane developed in this work were compared with literature data for the case of the pervaporation separation of the methanol—methyl acetate mixture close to azeotrope. Table 5 summarizes the results obtained for different polymers and feed compositions from a number of papers [29,46,47,48]. These data show that the separation factor of the P84/Fe@C 60 (0.5%) membrane significantly exceeds this parameter for other membranes except PA/ND (3%) [47].…”

“…Table 5 summarizes the results obtained for different polymers and feed compositions from a number of papers [29,46,47,48]. These data show that the separation factor of the P84/Fe@C 60 (0.5%) membrane significantly exceeds this parameter for other membranes except PA/ND (3%) [47]. However, the flux of the last two membranes is much lower than that of the Pervap 2255 membranes.…”

Pervaporation Purification of Oxygenate from an Ethyl tert-Butyl Ether/Ethanol Azeotropic Mixture

“…The experimental density of the membranes ρ was measured by the flotation method [27] in a isopropanolcarbon tetrachloride solution at 25°C (ρ(iPrOH) = 0.786 g/cm 3 , ρ(СCl 4 ) = 1.594 g/cm 3 ).…”

“…Diffusion membranes with ND particles incorporated into the matrix of polyphenylene oxide and polyphenylene isophthalamide exhibited improved transport properties in gas separation processes [26,27] and in the pervaporation of a methanol-methyl acetate mixture [28].…”

Butanol-1 Dehydration via Pervaporation Using Membranes Based on Thermally Rearranged Polymer

“…The density ρ of films was evaluated by the flotation method using a laboratory measurement device [29]. A mixture of toluene and carbon tetrachloride was used to balance the samples at 293 K (ρ(toluene) = 0.867 g/cm 3 , ρ(CCl 4 ) = 1.594 g/cm 3 ).…”