Sulfonated polystyrene ionomers containing 4-aminobenzoic acid studied by a small-angle X-ray scattering technique

Song, Junyeob; Hong, Min Chul; Kim, Joon Seop; Yoo, J.K.; Yu, Jeong A; Kim, Whan Gi

doi:10.1007/bf03218323

Cited by 12 publications

(7 citation statements)

References 27 publications

(34 reference statements)

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“…In other words, the morphology of the crosslinked SPEEK membranes is not changed upon increasing the crosslinker content. 1,24,29,30 However, the SAXS peak intensity increases with decreasing crosslinker content. The increasing intensity illustrates that the number of scattering centers at the most prevalent inter-ionic domain distance increases.…”

Section: Resultsmentioning

confidence: 98%

Preparation and characterization of SPEEK membranes crosslinked by electron beam irradiation

et al. 2011

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Crosslinked sulfonated poly(ether ether ketone) (SPEEK) membranes were prepared by the radiation crosslinking of SPEEK with various crosslinker contents. The prepared membranes were subjected to a comparative study of proton exchange membranes (PEM) for fuel cell applications. The crosslinked SPEEK membranes were characterized by 1 H nuclear magnetic resonance spectroscopy (NMR), Fourier transform infrared spectroscopyattenuated total reflectance (FTIR-ATR), dynamic mechanical analysis (DMA), and Small angle X-ray scattering (SAXS). 1 H NMR and FTIR-ATR confirmed the sulfonation and crosslinking of the membranes. DMA indicated that the ionic modulus and cluster T g increased with decreasing crosslinker content. This suggests that the amount of clustering in the crosslinked membrane could be reduced by increasing the crosslinker content. SAXS data showed that the crosslinker did not affect the ionic domain morphology in the membranes. The proton conductivity of all the membranes was > 10 -2 S/cm. The overall findings suggest that the crosslinked SPEEK membranes offer the possibility for improving the performance of proton exchange membrane fuel cell (PEMFC), provided membranes with thermal and hydration stability.

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Section: Resultsmentioning

confidence: 98%

Preparation and characterization of SPEEK membranes crosslinked by electron beam irradiation

et al. 2011

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“…This implies that the role of ADA12 might be different from that of the rest of ADAs, at least to some extent. Figure 2(a) also includes the E′ ionic data of 4.5‐Na ionomers containing aliphatic dicarboxylates (DCAs) that act mainly as reinforcing filler,22 the ion content of which is slightly higher than that of 4.1‐ADA ionomers. It is seen that the E′ ionic of 4.5‐DCA ionomer increases initially and remains more or less constant as the chain length of DCA increases from C 6 to C 12 32.…”

Section: Resultsmentioning

confidence: 99%

“…Because the DCA acts mainly as filler, the matrix and cluster T g s remain constant with increasing chain length of DCAs. In the same figure, the T g s of monofunctional amine, AMA‐neutralized SPS ionomers (8.1 mol % of ion content), are also shown (data were obtained from Ref 22…”

Section: Resultsmentioning

confidence: 99%

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Dynamic mechanical properties of polystyrene‐co‐styrenesulfonic acid copolymers neutralized with aliphatic diamines

Luqman

Kim

et al. 2012

J of Applied Polymer Sci

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In this article, we reported the effects of the addition of various aliphatic diamines (ADAs) on the dynamic mechanical properties of poly(styrene-co-styrenesulfonic acid) copolymers. It was found that the ionic modulus decreased with increasing chain length of ADAs but increased for the ADA12-containing ionomers. Upon the neutralization of the copolymers with ADAs, a minor change in the size and position of the matrix loss tangent peak was observed. However, the position of the cluster loss tangent peaks shifted to lower temperatures, and the shift rate depended on the chain length of ADAs. Thus, it was suggested that the ADAs acted mainly as preferential plasticizer for the cluster regions. In addition, the effect of the amount of ADA on the difference between the matrix and cluster temperatures of the ionomers was strongest than that of the type of ADA or ion content. The X-ray peak of ADA12 suggested that the ADA12 acted both as plasticizer and as filler.

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“…The ionomer peak position is, again, in good accordance with the results reported before. 24,[28][29][30][31][32][33][34][35][36] In the case of the DCA16 system, an additional sharp peak is seen at q=3.0 nm -1 , but no additional peak is seen for the DCA4 system. The intensities of the sharp X-ray peaks for the MNa and SNa systems increase strongly and then slightly with increasing amount of the DCA16.…”

Section: Shown Inmentioning

confidence: 99%

Dynamic mechanical and morphological studies of styrene-co-methacrylate and sulfonated polystyrene ionomers containing aliphatic dicarboxylate salts

2009

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This study examined the effects of the sodium salts of aliphatic dicarboxylic acids (DCAs) on the dynamic mechanical properties and morphology of two sets of poly(styrene-co-sodium methacrylate) (MNa) and poly(styrene-co-sodium styrenesulfonate) (SNa) ionomers. When the DCA content was relatively low, the ionic moduli of the MNa and SNa ionomers increased but the matrix and cluster glass transition temperature (T g ) did not change significantly. The increasing ionic modulus was almost independent of the type of the ionic groups of the ionomer, and the chain length of DCAs. When a large amount of the sodium succinate (DCA4) was added to the MNa and SNa ionomers, the ionic moduli of the two ionomers increased strongly but the matrix and cluster T g 's increased slightly and significantly, respectively. In the case of sodium hexadecanedioate (DCA16), DCA16 increased the ionic moduli of the two ionomers. The addition of DCA16 changed the matrix and cluster T g 's of the MNa ionomer slightly, but decreased the cluster T g of the SNa ionomer significantly with no change in the matrix T g . In addition, the DCA-containing ionomers showed an X-ray diffraction peak indicating the presence of ordered domains of DCAs in the ionomers. Hence, DCA4 acts mainly as a reinforcing filler in MNa and SNa systems. In the case of DCA16, it initially behaved like a filler but also functioned as a preferential plasticizer for the clusters at high content.

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Sulfonated polystyrene ionomers containing 4-aminobenzoic acid studied by a small-angle X-ray scattering technique

Cited by 12 publications

References 27 publications

Preparation and characterization of SPEEK membranes crosslinked by electron beam irradiation

Preparation and characterization of SPEEK membranes crosslinked by electron beam irradiation

Dynamic mechanical properties of polystyrene‐co‐styrenesulfonic acid copolymers neutralized with aliphatic diamines

Dynamic mechanical and morphological studies of styrene-co-methacrylate and sulfonated polystyrene ionomers containing aliphatic dicarboxylate salts

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