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Properties of Phosphoric Acid Doped Poly(benzimidazole/sulfone/siloxane/amide)/Sulfonated Polystyrene/Silica Nanoparticle-based proton Exchange Membranes for Fuel Cells

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Chinese Journal of Polymer Science 2014年第10期32卷 1319-1328页

作者： Ayesha Kausar Muhammad Siddiq Nanosciences and Catalysis Division National Centre For Physics Quaid-i-Azam University CampusIslamabad 44000 Pakistan Department of Chemistry Quaid-i-Azam University Islamabad Pakistan

New siloxane and sulfone containing poly（benzimidazole/sulfone/siloxane/amide）（PBSSA） has been prepared for the formation of hybrid membranes （PBSSA/PS-S/SiNPs） with sulfonated polystyrene （PS-S） and 0.1 wt%-2 wt% silica nanoparticles （SiNPs）. Field emission scanning electron micrographs showed good dispersion of filler, formation of dense nanoporous honeycomb like structure and uniform ionic pathway in these hybrids. The porous membrane structure was responsible for the fine water retention capability and higher proton conductivity.of the new hybrids. Increasing the amount of nanoparticles from 0.1 wt% to 2 wt% increased the tensile stress of acid doped PBSSA/PS-S/SiNPs nanocomposites from 65.7 MPa to 68.5 MPa. A relationship between nanofiller loading and thermal stability of the membranes was also experientially studied, as the glass transition temperature of phosphoric acid doped PBSSAJPS-S/SiNPs nanocomposites increased from 207℃ to 215 ℃. The membranes also had higher ion exchange capacity （IEC） around 2.01 mmol/g to 3.01 mmol/g. The novel membranes with high IEC value achieved high proton conductivity.of 1.10-2.34 S/cm in a wide range of humidity values at 80 ~C which was higher than that of perfluorinated Nafion 117 membrane （1.1 × 10^-1 S/cm） at 80 ~C （94% RH）. A H2/O2 fuel cell using the PBSSA/PS-S/SiNP 2 （IEC 3.01 retool/g） showed better performance than that of Nation 117 at 40 ℃ and 30% RH.

关键词： Poly(benzimidazole/sulfone/siloxane/amide) Sulfonated polystyrene Silica nanoparticles Ion exchange capacity proton conductivity.

SULFONATED POLYIMIDES CONTAINING PYRIDINE GROUPS AS proton EXCHANGE MEMBRANE MATERIALS

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Chinese Journal of Polymer Science 2011年第5期29卷 532-539页

作者：高连勋 State Key Laboratory of Polymer Physics and Chemistry Changchun Institute of Applied Chemistry Chinese Academy of Sciences

A series of sulfonated polyimides （SPIs） containing pyridine groups were prepared by direct polycondensation from 1,4,5,8-naphthalenetetracarboxylic dianhydride （NTDA）, 4,4＇-diaminodiphenyl ether-2,2＇-disulfonic acid （ODADS） and 4-（4-methoxy）phenyl-2,6-bis（4-aminophenyl）pyridine （DAM）. The resulting copolymers displayed good solubility in common organic solvents. Flexible, transparent, tough membranes were obtained via solution casting. All the films showed high thermal stability with desulfonation temperature over 300℃. They exhibited prominent mechanical properties with Young＇s modulus around 2.0 GPa. High proton conductivity.（0.23 S/cm at 100% RH） was also observed. More importantly, the new materials exhibited low water uptake （30 wt%-75 wt% at 80℃） and improved water stability, which were attributed to the acid-base interaction between sulfonic acid and pyridine functional groups.

关键词： Sulfonated polyimide Pyridine Acid-base interaction proton conductivity. : Sulfonated polyimide Pyridine Acid-base interaction proton conductivity.

BLEND MEMBRANES FOR DIRECT METHANOL AND proton EXCHANGE MEMBRANE FUEL CELLS

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Chinese Journal of Polymer Science 2012年第4期30卷 548-560页

作者： Perumal Bhavani Dharmalingam Sangeetha Department of Chemistry Anna UniversityChennai 25India

Sulphonated polystyrene ethylene butylene polystyrene （SPSEBS） prepared with 35% sulphonation was found to be highly elastic and enlarged up to 300%-400% of its initial length. It absorbed over 110% of water by weight. A major drawback of this membrane is its poor mechanical properties which are not adequate for use as polymer electrolytes in fuel cells. To overcome this, SPSEBS was blended with poly（vinylidene fluoride）（PVDF）, a hydrophobic polymer. The blend membranes showed better mechanical properties than the base polymer. The effect of PVDF content on water uptake, ion exchange capacity and proton conductivity.of the blend membranes was investigated. This paper presents the results of recent studies applied to develop an optimized in-house membrane electrode assembly （MEA） preparation technique combining catalyst ink spraying and assembly hot pressing. Easy steps were chosen in this preparation technique in order to simplify the method, aiming at cost reduction. The open circuit voltage for the cell with SPSEBS is 0.980 V which is higher compared to that of the cell with Nation 117 （0.790 V）. From this study, it is concluded that a polymer electrolyte membrane suitable for proton exchange membrane fuel cell （PEMFC） and direct methanol fuel cell （DMFC） application can be obtained by blending SPSEBS and PVDF in appropriate proportions. The methanol permeability and selectivity showed a strong influence on DMFC performance.

关键词： Fuel cell Impedance Polymer blend proton conductivity.