Structure–property relationships for a series of polyimide copolymers with sulfonated pendant groups

Savard, Olivier; Peckham, Timothy J.; Yang, Yuan; Holdcroft, Steven

doi:10.1016/j.polymer.2008.09.011

Cited by 44 publications

(24 citation statements)

References 62 publications

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“…When the polymer having both hydrophobic and hydrophilic domains is electrospun, its hydrophobic and hydrophilic domains may segregate onto the outside as the air surface and the inside of the polymer solution, respectively. Consequently, the proton channel structure is formed within the nanofibers due to the network of the sulfamide and triazole ring, leading to a rapid transport of the proton within the proton transport sites (Figure 4)35.…”

Section: Discussionmentioning

confidence: 99%

Oriented MOF-polymer Composite Nanofiber Membranes for High Proton Conductivity at High Temperature and Anhydrous Condition

Pan

et al. 2014

Sci Rep

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The novel oriented electrospun nanofiber membrane composed of MOFs and SPPESK has been synthesized for proton exchange membrane fuel cell operating at high temperature and anhydrous conditions. It is clear that the oriented nanofiber membrane displays the higher proton conductivity than that of the disordered nanofiber membrane or the membrane prepared by conventional solvent-casting method (without nanofibers). Nanofibers within the membranes are significantly oriented. The proton conductivity of the oriented nanofiber membrane can reach up to (8.2 ± 0.16) × 10−2 S cm−1 at 160°C under anhydrous condition for the highly orientation of nanofibers. Moreover, the oxidative stability and resistance of methanol permeability of the nanofibers membrane are obviously improved with an increase in orientation of nanofibers. The observed methanol permeability of 0.707 × 10−7 cm2 s−1 is about 6% of Nafion-115. Consequently, orientated nanofibers membrane is proved to be a promising material as the proton exchange membrane for potential application in direct methanol fuel cells.

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Section: Discussionmentioning

confidence: 99%

Oriented MOF-polymer Composite Nanofiber Membranes for High Proton Conductivity at High Temperature and Anhydrous Condition

Pan

et al. 2014

Sci Rep

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“…[ 47 ] Copolymer 9a [ 42 ] was compared to 14 , in which the sulfonic acid functionalities are present on pendant benzylic ether groups. Water uptake is lower in the case of 14 compared to 9a , whereas proton conductivity is higher.…”

Section: Sulfonated Polyimidesmentioning

confidence: 99%

Structure‐Morphology‐Property Relationships of Non‐Perfluorinated Proton‐Conducting Membranes

2010

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A fundamental understanding of structure-morphology-property relationships of proton exchange membranes (PEMs) is crucial in order to improve the cost, performance, and durability of PEM fuel cells (PEMFCs). In this context, there has been an explosion over the past five years in the volume of research carried out in the area of non-perfluorinated, proton-conducting polymer membranes, with a particular emphasis on exploiting phase behavior associated with block and graft copolymers. This progress report highlights a selection of interesting studies in the area that have appeared since 2005, which illustrate the effects of factors such as acid and water contents and morphology upon proton conduction. It concludes with an outlook on future directions.

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“…[14][15][16][20][21][22][23][24][25][26][27][28][29][30][31][32][33][34][35] In thin films, aromatic polyimides (PIs) possessing a rigid and planar backbone exhibit a highly ordered lamella structure oriented parallel to the substrate plane with in-plane orientated backbones. 36 Notably, the molecular structure and ch-packing of imide and phenyl groups in PIs significantly vary depending on the aggregation structures, such as crystalline, liquid crystalline-like and amorphous.…”

Section: Introductionmentioning

confidence: 99%

Effect of Casting Solvent on Interfacial Molecular Structure and Proton Transport Characteristics of Sulfonated Polyimide Thin Films

et al. 2017

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Two sulfonated polyimide (SPI) thin films were prepared with water and THF/water mixed solvents, respectively. The SPI thin film prepared with THF/water showed more than 5 times higher proton conductivity than that prepared with water mixed solvent at low relative humidity (RH) and 298 K. In this study, polarized optical microscopy (POM), grazing incidence small angle X-ray scattering (GISAXS), and p-polarized multiple angle incidence resolution spectrometry (pMAIRS) were carried out to investigate liquid crystalline (LC) optical ordered structure, organized structure, and molecular orientation. The molecular ordered parts using LC properties in the SPI thin films exhibited an almost identical structure under the low RH condition. On the other hand, the molecular orientation of the imide C=O groups in the non-ordered parts, which could not be detected by POM and GISAXS, showed different angles. The proton conductivity under low RH conditions is affected by the degree of the molecular orientation in the non-ordered parts of the SPI thin films.

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Structure–property relationships for a series of polyimide copolymers with sulfonated pendant groups

Cited by 44 publications

References 62 publications

Oriented MOF-polymer Composite Nanofiber Membranes for High Proton Conductivity at High Temperature and Anhydrous Condition

Oriented MOF-polymer Composite Nanofiber Membranes for High Proton Conductivity at High Temperature and Anhydrous Condition

Structure‐Morphology‐Property Relationships of Non‐Perfluorinated Proton‐Conducting Membranes

Effect of Casting Solvent on Interfacial Molecular Structure and Proton Transport Characteristics of Sulfonated Polyimide Thin Films

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