Polymers of intrinsic microporosity derived from novel disulfone-based monomers

Peer reviewed: YesNRC publication: Ye

Modified polysulfones. III. Synthesis and characterization of polysulfone aldehydes for reactive membrane materials

Peer reviewed: YesNRC publication: Ye

Hydrocarbon/hydrogen mixed-gas permeation properties of PIM-1, an amorphous microporous spirobisindane polymer

Peer reviewed: YesNRC publication: Ye

Reinforced films based on cross-linked water-soluble sulfonated carbon nanotubes with sulfonated polystyrene

Reinforced films based on sulfonated polystyrene cross-linked with water-soluble sulfonated carbon nanotubes were fabricated using a free-standing film-making method. Transmission and scanning electron microscopy (TEM and SEM), and X-ray photoelectron spectroscopy (XPS) were used to verify the cross-linking reaction. The mechanical properties of these films demonstrated that the tensile strength increases with an increase in the sulfonated nanotube concentration. At 5 wt% nanotube loading, the tensile strength increased 84% compared with polymer containing no nanotube loading. The relationships between structure and mechanical properties are discussed and a possible direction for making ultra thin and ultra lightweight film is proposed.NRC publication: Ye

High-performance carboxylated polymers of intrinsic microporosity (PIMs) with tunable gas transport properties

Peer reviewed: YesNRC publication: Ye

Radiation-grafted membranes based on polyethylene for direct methanol fuel cells

Styrenewas grafted onto ultrahigh molecularweight polyethylene powder (UHMWPE) by gammairradiation using a 60Co source. Compression moulded films of selected pre-irradiated styrene-grafted ultrahigh molecular weight polyethylene (UHMWPE-g-PS) were post-sulfonated to the sulfonic acid derivative (UHMWPE-g-PSSA) for use as proton exchange membranes (PEMs). The sulfonation was confirmed by Xray photoelectron spectroscopy (XPS). The melting and flow properties of UHMWPE and UHMWPE-g-PS are conducive to forming homogeneous pore-free membranes. Both the ion conductivity and methanol permeability coefficient increased with degree of grafting, but the grafted membranes showed comparable or higher ion conductivity and lower methanol permeability than Nafion\uae 117 membrane. One UHMWPE-g-PS membrane was fabricated into a membrane\u2013electrode assembly (MEA) and tested as a single cell direct methanol fuel cell (DMFC). Low membrane cost and acceptable fuel cell performance indicate that UHMWPE-g-PSSA membranes could offer an alternative approach to perfluorosulfonic acidtype membranes for DMFC.Peer reviewed: YesNRC publication: Ye

Low-swelling proton-conducting copoly(aryl ether nitrile)s containing naphthalene structure with sulfonic acid groups meta to the ether linkage

NRC publication: Ye

Surface-modified polysulfone membranes: aqueous phase oxidation via persulfate radical

Peer reviewed: YesNRC publication: Ye

Properties of SPEEK based PEMs for fuel cell application

Peer reviewed: YesNRC publication: Ye

Increases in the proton conductivity and selectivity of proton exchange membranes for direct methanol fuel cells by formation of nanocomposites having proton conducting channels

Peer reviewed: YesNRC publication: Ye