Gas transport properties of 6FDA-TAPOB hyperbranched polyimide membrane

Suzuki, Tomoyuki; Yamada, Yasuharu; Tsujita, Yoshiharu

doi:10.1016/j.polymer.2004.08.025

Cited by 86 publications

(48 citation statements)

References 40 publications

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“…25 The fractional free volume (FFV) of hyperbranched polyimide 6FDA-TAPOB was higher than that of linear polyimide 6FDA-TPEQ and 6FDA-TPER due to looser packing of molecular chains of the 6FDA-TAPOB attributed to the characteristic hyperbranched structure. Gas permeability of 6FDA-TPER (P CO 2 ¼ 5:13, P O 2 ¼ 1:04, P N 2 ¼ 0:156 barrer) was lower than that of 6FDA-TPEQ (P CO 2 ¼ 12:6, P O 2 ¼ 2:24, P N 2 ¼ 0:371 barrer) because of the lower diffusivity of 6FDA-TPER attributed to both the lower FFV and the increased inhibition to the segmental mobility, beside its higher selectivity (6FDA-…”

Section: Tms1sihmentioning

confidence: 96%

“…Hyperbranched polyimide membranes were prepared from triamine monomers and diphthalic anhydrides. [23][24][25] Amineterminated hyperbranched polyimides were synthesized by condensation polymerization of tris(4-aminophenyl)amine (TAPA) and diphthalic anhydrides as shown in Scheme 4, and the obtained polyimides were treated with crosslinking agents such as ethylene glycol diglycidyl ether (EGDE) and terephtaldehyde (TPA) to give the hyperbranched polyimide membranes. 23 TPA-crosslinked 6FDA-TAPA membranes with low crosslinking content showed high gas permeability coefficient (P CO 2 ¼ 65, …”

Section: Tms1sihmentioning

confidence: 99%

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New Macromolecular Architectures for Permselective Membranes—Gas Permselective Membranes from Dendrimers and Enantioselectively Permeable Membranes from One-handed Helical Polymers—

Aoki

Kaneko

2005

Polym J

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ABSTRACT:Chemistry of macromolecular architecture is one of the fastest growing branches of polymer chemistry. The present review describes macromolecular architectures for permselective membranes relating their structures and permselectivity, and is focused on dendrimers for gas permselective membranes and one-handed helical polymer membranes for enantioselectively permeable membranes (optical resolution). The first part of this review described the three kinds of permselective membranes prepared from pure polydendrons or dendronized polymers having self-membrane-forming ability by us, and from another polymer and dendrimers or hyperbranched polymers as a crosslinker, and from another supporting membrane and dendrimers as a modifier. The membranes from polydendrons showed better oxygen permselectivities than those of conventional polymer membranes. In the second part, three kinds of enantioselectively permeable membranes reported by many researchers, i.e., chiral carriers-containing composite membranes, membranes based on chiral HPLC stationary phase polymers, and chiral molecular imprinting membranes, are reviewed briefly. In particular, the detail of our macromolecular designs of one-handed helical poly(substituted acetylene)s as materials for enantioselectively permeable membranes is discussed as the fourth category. When the content of the chiral groups was higher, the permselectivity was enhanced. The one-handed helical backbones were found to be effective for enantioselective permeation. It was also shown that the disadvantage of this method, i.e., low permeation rate was improved by using thinner membranes. In addition, enantioselectively permeable membranes are classified from the view point of their permeation mechanisms.

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Section: Tms1sihmentioning

confidence: 96%

Section: Tms1sihmentioning

confidence: 99%

New Macromolecular Architectures for Permselective Membranes—Gas Permselective Membranes from Dendrimers and Enantioselectively Permeable Membranes from One-handed Helical Polymers—

Aoki

Kaneko

2005

Polym J

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“…On the other hand, for the AM-HBPI-silica hybrid membranes, the effect of hybridization to gas permeability coefficient was very small, in particular, the diffusion coefficient was not increased even when the silica content increased. The increasing of the permeability coefficient due to the hybridization with silica was caused by 1) the additional formation of free volume holes, 2) the increased rigidity of the polymer chains resulting from the formation of crosslinking mediated by the silica domain, and 3) the formation of a Langmuir sorption site effective for gas transport properties [6,16,17]. In AM-HBPI-silica hybrid membranes, it is thought that an effect of the hybridization was hard to be taken because unreacted silanol groups remain in the silica domain due to the rigidity of the polymer chains which inhibit the progress of the sol-gel reaction.…”

Section: Gas Transport Propertiesmentioning

confidence: 99%

“…They have synthesized dianhydride-terminated (DA-) and amine-terminated (AM-) HBPIs by a different addition order and molar ratio of each monomer and revealed that HBPI membranes had a good gas separation performance compared with linear-type polyimides [4,5]. We have also studied the gas transport properties of DA-HBPI membranes prepared by polycondensation reaction of a triamine, 1,3,5-tris(4-aminophenoxy) benzene (TAPOB), and a dianhydride, 4,4'-hexafluoroisopropylidene) diphthalic anhydride (6FDA), and found that these HBPI membranes exhibit high gas permeability and O 2 /N 2 selectivity arising from its characteristic hyperbranched structure [6]. Additionally, we have studied the syntheses and gas transport properties of dianhydride-terminated hyperbranched polyimidesilica hybrid (DA-HBPI-silica hybrid) membranes.…”

Section: Introductionmentioning

confidence: 99%

Structure-gas Transport Property Relationship of Hyperbranched Polyimide-silica Hybrid Membranes

Miki

Suzuki

Yamada

2013

J. Photopol. Sci. Technol.

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Physical and gas transport properties of amine-terminated hyperbranched polyimide-silica hybrid (AM-HBPI-silica hybrid) membranes prepared with a dianhydride, 4,4'-(hexafluoroisopropylidene)diphthalic anhydride, and a triamine, 1,3,5-tris(4-amino-phenoxy)benzene, were investigated and compared with those of dianhydride-terminated hyperbranched polyimide-silica hybrid (DA-HBPI-silica hybrid) membranes. HBPI-silica hybrid membranes were prepared via sol-gel reaction using hyperbranched polyamic acid of which end groups were modified with silane coupling agents, water and tetramethoxysilane. Although the AM-HBPI membrane was colored to dark brown, optical transmittances of AM-HBPI-silica hybrid membranes increased with increasing silica content. Thermal and dimensional stability of AM-HBPI-silica hybrids are higher than those of DA-HBPI-silica hybrids because of the rigidity of AM-HBPI molecular chains which contain more branching units. Gas permeability and CO 2 /CH 4 selectivity of DA-and AM-HBPI-silica hybrid membranes increased with increasing silica content. Especially, CO 2 /CH 4 selectivity of AM-HBPI-silica hybrid membranes remarkably increased with increasing silica content. This behavior is probably due to the characteristic distribution and interconnectivity of free volume holes created by the incorporation of silica and the high affinity of hydroxyl groups remaining in the silica domain to CO 2 .

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“…This result indicates the additional formation of free-volume holes and a Langmuir sorption site effective for gas transport properties through hybridization or composition with silica [14,25,26]. By contrast, the gas permeability coefficients of the HBPI-silica HBD and CPT membranes prepared with colloidal silica increased very little with increasing silica content.…”

Section: Gas Permeabilitymentioning

confidence: 92%

Synthesis and Gas Transport Properties of Hyperbranched Polyimide–Silica Hybrid/Composite Membranes

2013

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Hyperbranched polyimide-silica hybrids (HBPI-silica HBDs) and hyperbranched polyimide-silica composites (HBPI-silica CPTs) were prepared, and their general and gas transport properties were investigated to clarify the effect of silica sources and preparation methods. HBPI-silica HBDs and HBPI-silica CPTs were synthesized by two-step polymerization of A 2 + B 3 monomer system via polyamic acid as precursor, followed by hybridizing or blending silica sources. Silica components were incorporated by the sol-gel reaction with tetramethoxysilane (TMOS) or the addition of colloidal silica. In HBPI-silica HBDs, the aggregation of silica components is controlled because of the high affinity of HBPI and silica caused by the formation of covalent bonds between HBPI and silica. Consequently, HBPI-silica HBDs had good film formability, transparency, and mechanical properties compared with HBPI-silica CPTs. HBPI-silica HBD and CPT membranes prepared via the sol-gel reaction with TMOS showed specific gas permeabilities and permselectivities for CO 2 /CH 4 separation, that is, both CO 2 permeability and CO 2 /CH 4 selectivity increased with increasing silica content. This result suggests that gas transport can occur through a molecular sieving effect of the porous silica network derived from the sol-gel reaction and/or through the narrow interfacial region between the silica networks and the organic matrix. OPEN ACCESSPolymers 2013, 5 1363

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Gas transport properties of 6FDA-TAPOB hyperbranched polyimide membrane

Cited by 86 publications

References 40 publications

New Macromolecular Architectures for Permselective Membranes—Gas Permselective Membranes from Dendrimers and Enantioselectively Permeable Membranes from One-handed Helical Polymers—

New Macromolecular Architectures for Permselective Membranes—Gas Permselective Membranes from Dendrimers and Enantioselectively Permeable Membranes from One-handed Helical Polymers—

Structure-gas Transport Property Relationship of Hyperbranched Polyimide-silica Hybrid Membranes

Synthesis and Gas Transport Properties of Hyperbranched Polyimide–Silica Hybrid/Composite Membranes

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