Synthesis and gas transport properties of rigid block copolyaramides

Loría‐Bastarrachea, María Isabel; Aguilar‐Vega, Manuel

doi:10.1016/j.memsci.2010.11.028

Cited by 14 publications

(9 citation statements)

References 32 publications

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“…The same trend was observed for the selectivity of CO 2 /N 2. These results are almost similar to the values predicted by the mixing rule [28,29,30]: lnP = φ 1 lnP 1 + φ 2 lnP 2 , where φ is the volume fraction, P is the permeability coefficient and subscripts 1 and 2 indicate the corresponding homopolymers.…”

Section: Resultssupporting

confidence: 85%

“…In contrast, the gas permeability of (PIM-PI)-(6FDA-durene-PI)(1:10) composition was expected to be lower than the other two compositions based on the comparatively lower d-spacing in its microstructure. Moreover, the separation performances of all copolymer membranes is expected to follow the simple mixing rule [28,29,30] [lnP = φ1 lnP1 + φ2 lnP2, where φ is the volume fraction of each polymer] forthe random-type copolymers.…”

Section: Resultsmentioning

confidence: 99%

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A Facile Synthesis of (PIM-Polyimide)-(6FDA-Durene-Polyimide) Copolymer as Novel Polymer Membranes for CO2 Separation

2019

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Random copolymers made of both (PIM-polyimide) and (6FDA-durene-PI) were prepared for the first time by a facile one-step polycondensation reaction. By combining the highly porous and contorted structure of PIM (polymers with intrinsic microporosity) and high thermomechanical properties of PI (polyimide), the membranes obtained from these random copolymers [(PIM-PI)-(6FDA-durene-PI)] showed high CO2 permeability (>1047 Barrer) with moderate CO2/N2 (> 16.5) and CO2/CH4 (> 18) selectivity, together with excellent thermal and mechanical properties. The membranes prepared from three different compositions of two comonomers (1:4, 1:6 and 1:10 of x:y), all showed similar morphological and physical properties, and gas separating performance, indicating ease of synthesis and practicability for production in large scale. The gas separation performance of these membranes at various pressure ranges (100–1500 torr) was also investigated.

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Section: Resultssupporting

confidence: 85%

Section: Resultsmentioning

confidence: 99%

A Facile Synthesis of (PIM-Polyimide)-(6FDA-Durene-Polyimide) Copolymer as Novel Polymer Membranes for CO2 Separation

2019

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“…These microdomains are not related to crystalline structure but based on highly oriented and well‐ordered regions formed by rigid APBI blocks. Microdomains order increases with block length and become more random as block length decreases 43. The highly oriented and well‐ordered block copolyimide structure efficiently promoted molecular orientation in block copolyimides as compared to random copolyimides.…”

Section: Resultsmentioning

confidence: 99%

Synthesis and characterization of benzimidazole‐based low CTE block copolyimides

urRehman

Song

et al. 2013

J of Applied Polymer Sci

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A series of block and random copolyimide films were synthesized from various molar ratios of two diamines, rigid 2-(4aminophenyl)-5-aminobenzimidazole (APBI) and flexible 4,4 0 -oxydianiline (ODA) by polycondensation with dianhydride 3,3 0 ,4,4 0biphenyltetracarboxylic dianhydride. The contents of APBI ranged from 10 to 60 mol % in copolyimides. The copolyimide films obtained by thermal imidization of poly(amic acid) solutions, were characterized by TMA, DMA, TGA, DSC, wide-angle X-ray diffraction, FTIR, tensile testing, water uptake (WU), and dielectric constant measurements. Rigid heterocyclic diamine APBI with interchain hydrogen bonding capability, led to low coefficient of thermal expansion (CTE), high T g , high thermal stability and better mechanical properties. Increasing the APBI mol % caused a gradual decrease in the CTE and increase in T g , thermal stability and tensile strength properties of the copolyimides films. Moreover, significantly enhanced thermal and mechanical properties of the block copolyimides were also found as compared to random copolyimides. The block copolyimide with APBI content of 60 mol %, achieved excellent properties, that is, a low CTE (4.7 ppm/K), a high T g at 377 C, 5% weight loss at 562 C and a tensile strength at 198 MPa. This can be interpreted because of comparatively higher degree of molecular orientation in block copolyimides. These copolyimides also exhibited better dielectric constant and WU. This combination of properties makes them attractive candidates for base film materials in future microelectronics.

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“…The synthesis and gas transport properties of rigid block copolyaramides were also reported. 85 The block copolymers containing a highly gas permeable rigid segment and a barrier aramide presented lower permeability values than that in the homopolymer with the higher gas permeability, but the gas transport was well described by a parallel arrangement of nanodomains; hence those models developed in the last century were validated.…”

Section: Di-block and Tri-block Copolymer Membranesmentioning

confidence: 99%

Some approaches for high performance polymer based membranes for gas separation: block copolymers, carbon molecular sieves and mixed matrix membranes

Yave²,

2012

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The intrinsic characteristics of a membrane process, i.e. efficiency and operational simplicity, high selectivity and permeability for the transport of specific components, compatibility between different membrane operations in integrated systems, low energetic requirements, easy control and scale-up, and high operational flexibility, might be decisive factors in imposing membrane processes in most gas separation fields. This review highlights the research hardware in membrane gas separation, i.e. the membrane material. Emphasis has been devoted to three interesting and important membrane classes for gas separation: block copolymer membranes, carbon membranes and mixed matrix membranes.

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Synthesis and gas transport properties of rigid block copolyaramides

Cited by 14 publications

References 32 publications

A Facile Synthesis of (PIM-Polyimide)-(6FDA-Durene-Polyimide) Copolymer as Novel Polymer Membranes for CO2 Separation

A Facile Synthesis of (PIM-Polyimide)-(6FDA-Durene-Polyimide) Copolymer as Novel Polymer Membranes for CO2 Separation

Synthesis and characterization of benzimidazole‐based low CTE block copolyimides

Some approaches for high performance polymer based membranes for gas separation: block copolymers, carbon molecular sieves and mixed matrix membranes

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