Polyimides membranes for pervaporation and biofuels separation

Jiang, Lan Ying; Wang, Yan; Chung, Tai‐Shung; Qiao, Xiang Yi; Lai, Jun-Yih

doi:10.1016/j.progpolymsci.2009.06.001

Cited by 363 publications

(140 citation statements)

References 101 publications

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“…This polymer has already been used in many applications, including membrane separation techniques. [9][10][11][12][13] However, to the best of our knowledge, the application of IPDA-based PEIs, except for Ultem, to gas separation has only been described in five articles. 10,[14][15][16][17] Eastmond et al 14 described the permeability and diffusion coefficients for oxygen, carbon dioxide, nitrogen and argon in a membrane that was made from a PEI obtained from IPDA and 4,4 0 -bis(4 00 -aminophenoxy) biphenyl.…”

Section: Introductionmentioning

confidence: 99%

“…The Ultem properties were measured using the same procedures and compared with the data that were provided by the manufacturer or found in the literature. [9][10][11][12][13][14] This work is a continuation of our earlier research 18 and was performed to find a correlation between the polyimide structure and its physical properties. Although much information has been gathered on polyimides, the development of new methodologies for PI chemical modification, which could enhance the application potential of PIs, is still required.…”

Section: Introductionmentioning

confidence: 99%

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Structure and properties of new highly soluble aromatic poly(etherimide)s containing isopropylidene groups

Wolińska‐Grabczyk

Schab‐Balcerzak

Grabiec

et al. 2013

Polym J

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A series of amorphous poly(etherimide)s (PEIs) was synthesized from 4,4 0 -(4,4 0 -isopropylidene-diphenoxy)bis(phthalic anhydride) and different diamines or from 4,4 0 -(4,4 0 -isopropylidene-diphenyl-1,1 0 -diyldioxy)dianiline and 4,4 0 -(hexafluoroisopropylidene)diphthalic anhydride. The structures of the obtained PEIs were confirmed by Fourier transform infrared spectroscopy (FTIR), 1 H and 13 C nuclear magnetic resonance spectroscopies ( 1 H and 13 C NMR) and by elemental analysis. These polymers show excellent solubility in a broad range of solvents and produce strong and flexible films. The films were examined using differential scanning calorimetry (DSC), dynamic mechanical analysis (DMA), thermogravimetric analysis (TGA), wide-angle X-ray diffraction (WAXD) and mechanical testing, and were characterized by gas transport measurements. The obtained films exhibit thermal stability up to 500 1C, good mechanical properties and a CO 2 permeability of 7.85 Barrer with a CO 2 /N 2 selectivity of 21.2 for the polymer that contains hexafluoroisopropylidene moieties. The effects of the chemical structures on the physical and gas permeation properties were studied. The introduction of bulky cardo or hexafluoroisopropylidene moieties into the polymer chain increases the glass transition temperature (T g ) and fractional free volume (FFV), while the incorporation of additional ether linkages produces the opposite effect. Using an existing free volume approach, we found that the permeabilities of the studied PEIs are well correlated with their FFVs. Polymer Journal (2013) 45, 1202-1209; doi:10.1038/pj.2013.49; published online 22 May 2013 Keywords: gas transport properties; poly(etherimide)s; polyimides; thermal properties INTRODUCTION Aromatic polyimides (PIs) were first produced in 1908; since then, interest in this type of polymers has been growing because of their exceptional properties, such as excellent thermal, thermo-oxidative and dimensional stability; high radiation and solvent resistance; low dielectric constant; and unusually good mechanical properties. [1][2][3] This unique combination of properties makes PIs ideal for a variety of applications, for example, in microelectronics, microelectromechanical systems, aerospace and photoelectronics or as gas separation membranes, materials for memory devices, alignment layers in liquid crystal displays, and redox-active, electrochromic polymers. 3-6 Although many excellent polyimides are known and commercially available, new polyimides are emerging as research continues on the chemical structure-property correlations and on the search for new compounds with unique combinations of properties for special applications. Recently, particular attention has been paid to new materials and technologies for gas separation applications because of environmental concerns and economic interests. Polymeric gas separation membranes exhibit good mechanical properties, often

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Structure and properties of new highly soluble aromatic poly(etherimide)s containing isopropylidene groups

Wolińska‐Grabczyk

Schab‐Balcerzak

Grabiec

et al. 2013

Polym J

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“…Consequently, they have been used as adhesives, matrix resins, fibers, films, membranes, foams and so on. [1][2][3][4] Polyimides containing sixmember imide rings possessing naphthylimide structure have received little attention primarily due to the inability of obtaining soluble precursors for fabrication. Previous work on six-member polyimides has shown that the polymer system exhibited excellent thermal and thermooxidative resistance and very good hydrolytic stability in highly corrosive basic and acidic media.…”

Section: Introductionmentioning

confidence: 99%

Photo-optical properties of poly(oxadiazole-imide)s containing naphthalene rings

Damaceanu

Rusu

Brumă

et al. 2010

Polym J

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Two series of poly(oxadiazole-imide)s based on naphthalene-containing anhydrides and aromatic diamines containing preformed oxadiazole rings have been synthesized and their properties studied and compared. One series contains four polymers: two of them are based on naphthalene-1,4,5,8-tetracarboxylic dianhydride and the other two are based on bis(ketonaphthalicanhydride). The other series contains four copolymers based on mixtures of these dianhydrides with hexafluoroisopropylidenediphthalic anhydride. The thermal stability of these polymers and copolymers and their photo-optical properties in solution and solid state have been investigated.

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“…1) in a two dimensional factor space was investigated using acidified mobile phases containing the anionic surfactant sodium dodecyl sulphate (SDS) and methanol. Aromatic diamines are an important class of compounds applied in different fields of industry for making dyes and cosmetics [26,27], particularly, in the synthesis of a number of polymers [28][29][30]. Due to the toxic nature and potential carcinogenic properties of these compounds, monitoring of their levels in the environment is important for the protection of health and the environment [26,[31][32][33][34].…”

Section: Introductionmentioning

confidence: 99%

Evaluation of Some Empirical Retention Models for High Submicellar Liquid Chromatographic Separation of Aromatic Diamines

Hadjmohammadi¹,

Nazari²

2015

Acta Chromatographica

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Summary. Description of the retention of five aromatic diamines in high submicellar liquid chromatography was carried out through several hyperbolic and logarithmic retention models using the retention data of mobile phases consisting of sodium dodecyl sulfate (SDS) (0.09-0.15 M) and methanol (50-70% v/v) at pH 3. Among the investigated models, the logarithmic retention modelshowed the best prediction capability and used to predict the solutes retention factors. The mean relative error of the prediction of retention factors of five aromatic diamines in the selected variables space was lower than 0.5%. Based on the best retention model, a grid search program was used to predict the retention times of each solute for all combinations of SDS and methanol concentrations in the factor space. In order to find optimal separation condition, two different chromatographic goals, analysis time and retention differences between adjacent peaks, were evaluated simultaneously using Derringer's desirability function for each mobile phase composition. At the optimal conditions (0.143 M SDS, 53% v/v methanol), a good agreement was observed between predicted and experimental values of the retention times (R 2 = 0.9999 and mean relative error of 0.96%).

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Polyimides membranes for pervaporation and biofuels separation

Cited by 363 publications

References 101 publications

Structure and properties of new highly soluble aromatic poly(etherimide)s containing isopropylidene groups

Structure and properties of new highly soluble aromatic poly(etherimide)s containing isopropylidene groups

Photo-optical properties of poly(oxadiazole-imide)s containing naphthalene rings

Evaluation of Some Empirical Retention Models for High Submicellar Liquid Chromatographic Separation of Aromatic Diamines

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