Colloidal Dispersion of a Perfluorosulfonated Ionomer in Water–Methanol Mixtures
We have investigated the dispersion state of a perfluorosulfonated ionomer (PFSI; Nafion®) in aqueous dispersion and the effect of methanol (MeOH) added to the aqueous dispersion by small-angle X-ray scattering (SAXS) as well as static and dynamic light scattering (SLS and DLS, respectively). Althou...
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| Format: | Article |
| Language: | English |
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MDPI AG
2018-01-01
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| Series: | Polymers |
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| Online Access: | http://www.mdpi.com/2073-4360/10/1/72 |
| _version_ | 1811316361439215616 |
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| author | Sinan Li Ken Terao Takahiro Sato |
| author_facet | Sinan Li Ken Terao Takahiro Sato |
| author_sort | Sinan Li |
| collection | DOAJ |
| description | We have investigated the dispersion state of a perfluorosulfonated ionomer (PFSI; Nafion®) in aqueous dispersion and the effect of methanol (MeOH) added to the aqueous dispersion by small-angle X-ray scattering (SAXS) as well as static and dynamic light scattering (SLS and DLS, respectively). Although both electrostatic and hydrophobic interactions of PFSI are expected to be strong in the dispersions, SAXS profiles obtained were satisfactorily fitted by the spherical particle model of a bimodal molar mass distribution. The rod-like aggregate model proposed in previous papers was denied at least for the present PFSI dispersion. Although the SAXS profiles exhibited a weak peak and the auto-correlation functions of DLS showed a log-time decay by the “repulsive cage effect” due to the long-ranged electrostatic interaction among PFSI particles, the concentration dependence of SLS results was probably normal because the cancellation of the electrostatic and hydrophobic interactions. The addition of MeOH into the aqueous dispersion of PFSI weakened both the hydrophobic and electcrostatic interactions of PFSI, and it is rather difficult to classify whether MeOH is a good or poor solvent (dispersant) for PFSI. |
| first_indexed | 2024-04-13T11:47:21Z |
| format | Article |
| id | doaj.art-9f23094965e048ebbd0ba3918b524c38 |
| institution | Directory Open Access Journal |
| issn | 2073-4360 |
| language | English |
| last_indexed | 2024-04-13T11:47:21Z |
| publishDate | 2018-01-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Polymers |
| spelling | doaj.art-9f23094965e048ebbd0ba3918b524c382022-12-22T02:48:09ZengMDPI AGPolymers2073-43602018-01-011017210.3390/polym10010072polym10010072Colloidal Dispersion of a Perfluorosulfonated Ionomer in Water–Methanol MixturesSinan Li0Ken Terao1Takahiro Sato2Department of Macromolecular Science, Osaka University, Toyonaka Osaka 560-0043, JapanDepartment of Macromolecular Science, Osaka University, Toyonaka Osaka 560-0043, JapanDepartment of Macromolecular Science, Osaka University, Toyonaka Osaka 560-0043, JapanWe have investigated the dispersion state of a perfluorosulfonated ionomer (PFSI; Nafion®) in aqueous dispersion and the effect of methanol (MeOH) added to the aqueous dispersion by small-angle X-ray scattering (SAXS) as well as static and dynamic light scattering (SLS and DLS, respectively). Although both electrostatic and hydrophobic interactions of PFSI are expected to be strong in the dispersions, SAXS profiles obtained were satisfactorily fitted by the spherical particle model of a bimodal molar mass distribution. The rod-like aggregate model proposed in previous papers was denied at least for the present PFSI dispersion. Although the SAXS profiles exhibited a weak peak and the auto-correlation functions of DLS showed a log-time decay by the “repulsive cage effect” due to the long-ranged electrostatic interaction among PFSI particles, the concentration dependence of SLS results was probably normal because the cancellation of the electrostatic and hydrophobic interactions. The addition of MeOH into the aqueous dispersion of PFSI weakened both the hydrophobic and electcrostatic interactions of PFSI, and it is rather difficult to classify whether MeOH is a good or poor solvent (dispersant) for PFSI.http://www.mdpi.com/2073-4360/10/1/72Nafionionomercolloidal dispersionsmall-angle X-ray scatteringlight scatteringelectrostatic interactionhydrophobic interaction |
| spellingShingle | Sinan Li Ken Terao Takahiro Sato Colloidal Dispersion of a Perfluorosulfonated Ionomer in Water–Methanol Mixtures Polymers Nafion ionomer colloidal dispersion small-angle X-ray scattering light scattering electrostatic interaction hydrophobic interaction |
| title | Colloidal Dispersion of a Perfluorosulfonated Ionomer in Water–Methanol Mixtures |
| title_full | Colloidal Dispersion of a Perfluorosulfonated Ionomer in Water–Methanol Mixtures |
| title_fullStr | Colloidal Dispersion of a Perfluorosulfonated Ionomer in Water–Methanol Mixtures |
| title_full_unstemmed | Colloidal Dispersion of a Perfluorosulfonated Ionomer in Water–Methanol Mixtures |
| title_short | Colloidal Dispersion of a Perfluorosulfonated Ionomer in Water–Methanol Mixtures |
| title_sort | colloidal dispersion of a perfluorosulfonated ionomer in water methanol mixtures |
| topic | Nafion ionomer colloidal dispersion small-angle X-ray scattering light scattering electrostatic interaction hydrophobic interaction |
| url | http://www.mdpi.com/2073-4360/10/1/72 |
| work_keys_str_mv | AT sinanli colloidaldispersionofaperfluorosulfonatedionomerinwatermethanolmixtures AT kenterao colloidaldispersionofaperfluorosulfonatedionomerinwatermethanolmixtures AT takahirosato colloidaldispersionofaperfluorosulfonatedionomerinwatermethanolmixtures |