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Poly(phenylene sulfide)-graphite composites for bipolar plates with preferred morphological orientation

  • Polymer, Industrial Chemistry
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Abstract

Bipolar plates in phosphoric acid fuel cells require inertness to phosphoric acid as well as excellent electrical, thermal, and mechanical properties. For this application, we prepared poly(phenylene sulfide) (PPS)-graphite composites with random or ordered graphite orientations by compression and extrusion-compression processes, respectively. Due to current limitations of extruding graphite-filled polymers, only moderately high graphite concentrations were used (up to 40 wt%). The compressed composites contained graphite sheets in a planar orientation (parallel to the pressing direction) and exhibited highly anisotropic electrical and thermal conductivity, with much higher in-plane than through-plane components. In contrast, composites that were extruded prior to compression exhibited randomly oriented graphite due to shearing forces during extrusion and therefore displayed isotropic properties. Thus, their through-plane electrical and thermal conductivity was superior to those of the ordered composite, while the in-plane properties were inferior. Notably, the internal graphitic structure affected the electrical conductivity more than the thermal conductivity. The randomly oriented composite also exhibited superior flexural strength, although the thermal stability of the two composites was almost equal. This study offers insights into the structure-property relationship of PPS-graphite composites as well as the effect of the orientation of conductive two-dimensional fillers on anisotropic properties.

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Abbreviations

ID/IG :

ratio of intensities of the D and G bands

I002/I100 :

ratio of intensities of the 100 and 002 reflections of graphite

Rs :

sheet resistance

ϕ :

graphite concentration [wt%]

λ :

wavelength of radiation

θ :

Bragg angle

β :

full width at half maximum (FWHM)

Δg:

weight gain of the composite sample [wt%]

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Acknowledgements

This work was supported by the National Research Foundation of Korea (grant number NRF-2016M1A2A2937163) and the Korea Institute of Energy Technology Evaluation and Planning of Korea (grant number KETEP-20163010032040).

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Authors and Affiliations

  1. Department of Polymer Science & Engineering, Polymeric Nanomaterials Laboratory, School of Applied Chemical Engineering, Kyungpook National University, 80 Daehak-ro, Buk-gu, Daegu, 41566, Korea

    Ho-Joon Park & Soo-Young Park

  2. Morgan Advanced Materials, Advanced Center of Engineering, 23, Dalseong2cha 4-ro, Guji-myeon, Dalseong-gun, Daegu, 43013, Korea

    Jong Seok Woo

Authors
  1. Ho-Joon Park
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  2. Jong Seok Woo
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Correspondence to Soo-Young Park.

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Park, HJ., Woo, J.S. & Park, SY. Poly(phenylene sulfide)-graphite composites for bipolar plates with preferred morphological orientation. Korean J. Chem. Eng. 36, 2133–2142 (2019). https://doi.org/10.1007/s11814-019-0397-5

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  • DOI: https://doi.org/10.1007/s11814-019-0397-5

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