Thermally treated copoly(ether-imide)s made from bpda and alifatic plus aromatic diamines. GAS separation properties with different aromatic diamimes

Tena, Alberto; Marcos‐Fernández, Ángel; Lozano, Ángel E.; Campa, José G. de la; Abajo, Javier de; Palacio, Laura; Prádanos, Pedro; Hernández, Antonio

doi:10.1016/j.memsci.2011.10.008

Cited by 37 publications

(60 citation statements)

References 52 publications

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“…TGA analysis confirmed that the polyether chains are much less thermally stable than the aromatic segments, as already found for another copoly(ether-imide)s based on poly(ethylene oxide) [16] and therefore a selective degradation of the polyether moiety can be performed in these copolymers. The temperature of maximum weight loss rate took place between 360-380 ºC for all copolymers.…”

Section: Thermal Stabilitysupporting

confidence: 78%

“…This result can be explained in terms of the size of the crystals that strongly influence the melting point. It has already been found for similar copolymers, based on diamines of different rigidity, that diamines with higher rigidity had lower T g values and lower melting points for the PEO segments [16].…”

Section: Calorimetric Studiesmentioning

confidence: 69%

“…The samples were heated in a DSC instrument with a cyclic method in order to monitor the changes in their thermal properties with thermal treatment [16]. All the copolymers showed only the T g , and in some cases the melting temperature, T m , for the poly(ethylene oxide) segments, and no transition for the aromatic polyimide segments could be detected.…”

Section: Calorimetric Studiesmentioning

confidence: 99%

“…In consequence, block-copolymers combining aromatic and PEO polyimides appear to be a successful route [14,15]. These compounds have also good permselectivity for the couple CO 2 /N 2 , and usually this is attributed mainly to the high solubility-selectivity [16], which is due to the commented strong interactions of CO 2 with the oxyethylene group in PEO. The interaction between CO 2 and PEO has been discussed and used previously for the development of CO 2 selective membranes [17][18][19].…”

Section: Introductionmentioning

confidence: 99%

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Advances in the design of co-poly(ether-imide) membranes for CO2 separations. Influence of aromatic rigidity on crystallinity, phase segregation and gas transport

Tena

Marcos‐Fernández

Viuda

et al. 2015

European Polymer Journal

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SummaryIn our previous works, it was observed a clear relationship between the structure and the properties for different copoly(ether-imide)s, besides a good relation was found between SAXS characterization and permeability results. Here, a series of aliphatic aromatic copoly(ether-imide)s, based on an aromatic diamine (ODA), a diamine terminated poly(ethylene oxide) (PEO2000) of a molecular weight of 2000 g/mol and different aromatic dianhydrides (BPDA, BKDA (or BTDA) and PMDA )has been synthesized and characterized.The permeability for O2, N2, CO2 and CH4, increased with the rigidity of the monomers (BKDA < BPDA < PMDA), with the amount of PEO2000 in the copolymers, as well as with the increase in the temperature of treatment of the films. In this case, it was observed that when the proportion of PEO in the copolymer exceeded 50%, the permeability was similar for all samples, and the aromatic portion had no significant influence.Attending to glass transition temperature, Tg, of the aliphatic part, to its melting temperature, Tm, and to its crystallinity, segregation was better for more rigid dianhydrides at lower temperatures of treatment. Higher dianhydride rigidity produced better mechanical properties that were good but decreased a little bit when the percentage of PEO in the samples increased.Good permeselectivity compromises were attained for the CO2/N2 separation .This work gives light to design advanced materials for this separation with the increasing possibilities of controled structure and properties.

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Section: Thermal Stabilitysupporting

confidence: 78%

Section: Calorimetric Studiesmentioning

confidence: 69%

Section: Calorimetric Studiesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Advances in the design of co-poly(ether-imide) membranes for CO2 separations. Influence of aromatic rigidity on crystallinity, phase segregation and gas transport

Tena

Marcos‐Fernández

Viuda

et al. 2015

European Polymer Journal

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“…Measurements were carried out at 3 bar and 30 ºC. The equations used and the mode of operation of the equipment, as well as an outline of it, has been described previously 31,32 .…”

Section: Gas Permeation and Selectivitymentioning

confidence: 99%

Polymeric films based on blends of 6FDA–6FpDA polyimide plus several copolyfluorenes for CO₂ separation

et al. 2015

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Three emitting copolyfluorenes, based on 2,7-(9,9-dihexyl)fluorene and different aryl groups (1,4-bencene, PFH-B; 1,4-bencen-1,2,5-thiadiazole PFH-BT; 1,4-naphthalen-1,2,5-thiadiazole, PFH-NT), showing diverse acceptor character, in different proportions were blended with a polyimide 6FDA-6FpDA to make a series of films.These copolyfluorene-polyimide blends were prepared and characterized in solid state, using several techniques. The fluorescence of conjugated polymers can be used as a tool to understand the formation of the membrane and also to increase permeability and selectivity in comparison to films without fluorescence. The relationship between the intrinsic fluorescence of conjugated polyfluorenes and their gas separation properties has been explored in order to establish the influence of the composition and the nature of the aryl group, in the conjugated polymer, on the gas separation performances. In all cases, a low proportion of copolyfluorenes (< 1%weight) gives better CO 2 /CH 4 permselectivity properties than the original pure polyimide matrix. The best results were found for the samples that contain PFH-NT. This sample gives 25 % increase in the CO 2 permeability with 15 % increase in CO 2 /CH 4 selectivity. Finally, the loss of efficiency in conjugation mechanisms of absorption and emission of the samples could be explained on the basis of the π-staking of the polymer chains produced when a certain low percentage of conjugated polymers in the blend is surpassed. When this π-staking starts, gas permeation properties start to decline too.

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Influences of liquid electrolyte and polyimide identity on the structure and conductivity of polyimide–poly(ethylene glycol) materials

Coletta

Toney

Frank

2014

J of Applied Polymer Sci

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Current fuel cell technology demands improvements for widespread use, and novel polymer materials may be able to achieve the necessary enhancements. This work inspects the composition, structure, and properties of poly(ethylene glycol) (PEG)-aromatic polyimide systems aimed at polymer electrolyte membrane applications, as PEG is a known ion conductor and aromatic polyimides are quite stable. Liquid electrolytes were incorporated into the polymers through soaking to achieve ionic conductivity. By varying polyimide and liquid electrolyte, the polymers were analyzed for their structure and conductivity. Fourier transform infrared spectroscopy, thermal gravimetric analysis, differential scanning calorimetry, small-angle X-ray scattering, electrochemical impedance spectroscopy, and cyclic voltammetry were used as characterization tools. Electrolyte identity impacts liquid uptake and conductivity. Polyimide identity can influence the size and variability of the doped polymer structure, which ultimately can change conductivity by up to 28%, with the maximum conductivity being 102 mS/cm at 80 C and 70% RH.

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Thermally treated copoly(ether-imide)s made from bpda and alifatic plus aromatic diamines. GAS separation properties with different aromatic diamimes

Cited by 37 publications

References 52 publications

Advances in the design of co-poly(ether-imide) membranes for CO2 separations. Influence of aromatic rigidity on crystallinity, phase segregation and gas transport

Advances in the design of co-poly(ether-imide) membranes for CO2 separations. Influence of aromatic rigidity on crystallinity, phase segregation and gas transport

Polymeric films based on blends of 6FDA–6FpDA polyimide plus several copolyfluorenes for CO₂ separation

Influences of liquid electrolyte and polyimide identity on the structure and conductivity of polyimide–poly(ethylene glycol) materials

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Thermally treated copoly(ether-imide)s made from bpda and alifatic plus aromatic diamines. GAS separation properties with different aromatic diamimes

Cited by 37 publications

References 52 publications

Advances in the design of co-poly(ether-imide) membranes for CO2 separations. Influence of aromatic rigidity on crystallinity, phase segregation and gas transport

Advances in the design of co-poly(ether-imide) membranes for CO2 separations. Influence of aromatic rigidity on crystallinity, phase segregation and gas transport

Polymeric films based on blends of 6FDA–6FpDA polyimide plus several copolyfluorenes for CO2 separation

Influences of liquid electrolyte and polyimide identity on the structure and conductivity of polyimide–poly(ethylene glycol) materials

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Product

Resources

About

Polymeric films based on blends of 6FDA–6FpDA polyimide plus several copolyfluorenes for CO₂ separation