High‐pressure sorption of carbon dioxide and methane in all‐aromatic poly(etherimide)‐based membranes

Ogieglo, Wojciech; Madzarevic, Zeljka P.; Raaijmakers, Michiel J.T.; Dingemans, Theo J.; Benes, Nieck E.

doi:10.1002/polb.24001

Cited by 2 publications

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“…That, in addition to very high transition temperatures, often higher than their decomposition temperatures, limits their usefulness for many applications . Flexible and bulky linkage groups are traditionally being introduced between aromatic rings in the dianhydride monomer , to enhance solubility, transparency, and processing. The goal of these modifications is to either disrupt their aromaticity (to prevent intramolecular conjugation) or to make the chains pack less efficiently (to prevent intermolecular CTC formation).…”

Section: Introductionmentioning

confidence: 99%

Understanding the Effect of the Dianhydride Structure on the Properties of Semiaromatic Polyimides Containing a Biobased Fatty Diamine

Susa

Bijleveld

Santana

et al. 2017

ACS Sustainable Chem. Eng.

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In this work we report the effect of the hard block dianhydride structure on the overall properties of partially biobased semiaromatic polyimides. For the study, four polyimides were synthesized using aliphatic fatty dimer diamine (DD1) as the soft block and four different commercially available aromatic dianhydrides as the hard block: 4,4′-(4,4′-isopropylidenediphenoxy) bis(phthalic anhydride) (BPADA), 4,4′-oxidiphthalic anhydride (ODPA), 4,4′-(Hexafluoroisopropylidene) diphthalic anhydride (6FDA), and 3,3′,4,4′-biphenyltetracarboxylic dianhydride (BPDA). The polymers synthesized were fully organo-soluble thermoplastic branched polyimides with glass transition temperatures close to room temperature. The detailed analysis took into account several aspects of the dianhydrides structure (planarity, rigidity, bridging group between the phtalimides, and electronic properties) and related them to the results obtained by differential scanning calorimetry, rheology, fluorescence and broadband dielectric spectroscopy. Moreover, the effects of physical parameters (crystallization and electronic interactions) on the relaxation behavior are discussed. Despite the presence of the bulky branched soft block given by the dimer diamine, all polyimides showed intermolecular charge transfer complexes, whose extent depends on the electronic properties of the dianhydride hard block. Furthermore, the results showed that polyimides containing flexible and bulky hard blocks turned out fully amorphous while the more rigid dianhydride (BPDA) led to a nanophase separated morphology with low degree of crystallinity resulting in constrained segmental relaxation with high effect on its mechanical response with the annealing time. This work represents the first detailed report on the development and characterization of polyimides based on a biobased fatty dimer diamine. The results highlight the potential of polymer property design by controlled engineering of the aromatic dianhydride blocks.

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Section: Introductionmentioning

confidence: 99%

Understanding the Effect of the Dianhydride Structure on the Properties of Semiaromatic Polyimides Containing a Biobased Fatty Diamine

Susa

Bijleveld

Santana

et al. 2017

ACS Sustainable Chem. Eng.

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“…However, we found that the high permeability exhibited by PMDA-P1 stems from the sorption capacity of this membrane, not the free volume content measured for the virgin membrane. The high affinity of CO 2 toward the PMDA-P1 backbone 40 results in an increase of free volume by CO 2 sorption, leading to plasticization and an increase in gas permeation. 39 This correlates well with the DB results, where we identified PMDA-P1 as the material with the lowest amount of free volume, i.e., very similar to Kapton, 19 as was expected based on the backbone composition and chain packing ability.…”

Section: ■ Introductionmentioning

confidence: 99%

Free Volume in Poly(ether imide) Membranes Measured by Positron Annihilation Lifetime Spectroscopy and Doppler Broadening of Annihilation Radiation

et al. 2018

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In order to characterize the free volume of a homologous series all-aromatic poly(ether imide) (PEI) membranes, two positron annihilation techniques were utilized: positron annihilation lifetime spectroscopy (PALS) and Doppler broadening (DB) of annihilation radiation. First, DB, which is a fast and convenient method, indicated differences in free volume of all PEIs investigated, whereas PALS experiments gave more quantitative information, with respect to the size and distribution of the voids. DB results show that S, W pairs for this PEI-series tend to group according to their dianhydride moiety, meaning that, in this series, dianhydrides govern the differences in the S parameter, indicating more free volume with increasing S value. The semicrystalline PEI samples exhibit the lowest S parameter, while the amorphous samples based on 3,3′,4,4′-oxydiphthalic dianhydride (ODPA) all lie on the higher S side of the S–W plot. With the 1,4-bis(4-aminophenoxy)benzene (P1)-based PEI (ODPA-P1) standing out with the highest S parameter. The same could be confirmed and quantified by PALS, where ODPA-P1 is the only membrane in this series with its free volume described by both smaller and larger free-volume elements. The larger voids in ODPA-P1 can be characterized as having a radius (R) of 3.3 Å, which is 5 times larger than the lowest measured free-volume content in this series observed for 3,3′,4,4′-biphenyltetracarboxylic dianhydride (BPDA) and 1,3-bis(4-aminophenoxy)benzene (M1)-based PEI (BPDA-M1), which has voids with a radius of R ≈ 0.7 Å. When comparing results obtained by DB and PALS, a very good correlation is observed between the S parameter (determined by DB) and the free-volume content (quantified by PALS).

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High‐pressure sorption of carbon dioxide and methane in all‐aromatic poly(etherimide)‐based membranes

Cited by 2 publications

References 32 publications

Understanding the Effect of the Dianhydride Structure on the Properties of Semiaromatic Polyimides Containing a Biobased Fatty Diamine

Understanding the Effect of the Dianhydride Structure on the Properties of Semiaromatic Polyimides Containing a Biobased Fatty Diamine

Free Volume in Poly(ether imide) Membranes Measured by Positron Annihilation Lifetime Spectroscopy and Doppler Broadening of Annihilation Radiation

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