Investigation of the water states of poly(styrene sulfonic acid) grafted poly(ethylene-co-tetrafluoroethylene) copolymer using FT-IR analysis
The water states of poly(styrene sulfonic acid) (PSSA) grafted poly(ethylene-co-tetrafluoroethylene) copolymers (ETFE-PEMs) with grafting degree (GD)=8.8-30.5% are investigated under ambient conditions by using FTIR analysis. Detailed analysis of the FT-IR spectra of ETFE-PEMs allows the observatio...
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| Format: | Article |
| Language: | English |
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Vietnam Ministry of Science and Technology
2022-06-01
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| Series: | Vietnam Journal of Science, Technology and Engineering |
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| Online Access: | https://vietnamscience.vjst.vn/index.php/vjste/article/view/326 |
| _version_ | 1828047965366779904 |
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| author | Tran Trong Hieu Dinh Hoang Hao Lam Thanh Danh Tran Quang Luan Le Van Man Tran Truc Phuong Huynh Van Phuc Dinh Anh Tuyen Luu Kim Ngoc Pham Duy Tap Tran |
| author_facet | Tran Trong Hieu Dinh Hoang Hao Lam Thanh Danh Tran Quang Luan Le Van Man Tran Truc Phuong Huynh Van Phuc Dinh Anh Tuyen Luu Kim Ngoc Pham Duy Tap Tran |
| author_sort | Tran Trong Hieu Dinh |
| collection | DOAJ |
| description |
The water states of poly(styrene sulfonic acid) (PSSA) grafted poly(ethylene-co-tetrafluoroethylene) copolymers (ETFE-PEMs) with grafting degree (GD)=8.8-30.5% are investigated under ambient conditions by using FTIR analysis. Detailed analysis of the FT-IR spectra of ETFE-PEMs allows the observation of each component of water in the two broad bands of 1500-2000 cm-1 and 2400-3800 cm-1. These components include protonated water (H3O+…(H2O)n), H-bonded water to sulfonic acid groups ((SO3)…(H3O+)(H2O)n), H-bonded water to other water molecules ((H2O)…(H2O)), and non-H-bonded water (HOH…F). Of these water forms, ((SO3)…(H3O+)(H2O)n) is predominantly represented. Free water (non-H-bonded water) is assumed to be trapped in the holes of the ETFE backbone and is thus difficult to remove at 50oC over a 24 h period. The total peak areas of the water molecules significantly increase with GD indicating that the ETFE-PEM with higher GD possesses higher water content. Moreover, the increase of the total peak area with GD via two steps reveals an interesting relationship between the hierarchical structures and the capacity of water content under ambient conditions. The observed water content at ambient conditions can significantly affect the conductance of ETFE-PEMs under conditions of low relative humidity such as during fuel cell operation or measurement procedures of specific characterisations or testing methods.
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| first_indexed | 2024-04-10T18:50:05Z |
| format | Article |
| id | doaj.art-26305ddaa29d40e8a12be04917c66503 |
| institution | Directory Open Access Journal |
| issn | 2525-2461 2615-9937 |
| language | English |
| last_indexed | 2024-04-10T18:50:05Z |
| publishDate | 2022-06-01 |
| publisher | Vietnam Ministry of Science and Technology |
| record_format | Article |
| series | Vietnam Journal of Science, Technology and Engineering |
| spelling | doaj.art-26305ddaa29d40e8a12be04917c665032023-02-01T08:12:42ZengVietnam Ministry of Science and TechnologyVietnam Journal of Science, Technology and Engineering2525-24612615-99372022-06-0164210.31276/VJSTE.64(2).03-09Investigation of the water states of poly(styrene sulfonic acid) grafted poly(ethylene-co-tetrafluoroethylene) copolymer using FT-IR analysisTran Trong Hieu Dinh0Hoang Hao Lam1Thanh Danh Tran2Quang Luan Le3Van Man Tran4Truc Phuong Huynh5Van Phuc Dinh6Anh Tuyen Luu7Kim Ngoc Pham8Duy Tap Tran9Physics Laboratory, Le Thanh Ton High School, Ho Chi Minh cityUniversity of Science, Vietnam National University, Ho Chi Minh cityUniversity of Science, Vietnam National University, Ho Chi Minh cityBiotechnology Center of Ho Chi Minh cityUniversity of Science, Vietnam National University, Ho Chi Minh cityUniversity of Science, Vietnam National University, Ho Chi Minh cityInstitute of Fundamental and Applied Sciences, Duy Tan University, Ho Chi Minh cityCenter for Nuclear Technologies, Vietnam Atomic Energy Institute, Ho Chi Minh cityUniversity of Science, Vietnam National University, Ho Chi Minh cityUniversity of Science, Vietnam National University, Ho Chi Minh city The water states of poly(styrene sulfonic acid) (PSSA) grafted poly(ethylene-co-tetrafluoroethylene) copolymers (ETFE-PEMs) with grafting degree (GD)=8.8-30.5% are investigated under ambient conditions by using FTIR analysis. Detailed analysis of the FT-IR spectra of ETFE-PEMs allows the observation of each component of water in the two broad bands of 1500-2000 cm-1 and 2400-3800 cm-1. These components include protonated water (H3O+…(H2O)n), H-bonded water to sulfonic acid groups ((SO3)…(H3O+)(H2O)n), H-bonded water to other water molecules ((H2O)…(H2O)), and non-H-bonded water (HOH…F). Of these water forms, ((SO3)…(H3O+)(H2O)n) is predominantly represented. Free water (non-H-bonded water) is assumed to be trapped in the holes of the ETFE backbone and is thus difficult to remove at 50oC over a 24 h period. The total peak areas of the water molecules significantly increase with GD indicating that the ETFE-PEM with higher GD possesses higher water content. Moreover, the increase of the total peak area with GD via two steps reveals an interesting relationship between the hierarchical structures and the capacity of water content under ambient conditions. The observed water content at ambient conditions can significantly affect the conductance of ETFE-PEMs under conditions of low relative humidity such as during fuel cell operation or measurement procedures of specific characterisations or testing methods. https://vietnamscience.vjst.vn/index.php/vjste/article/view/326ETFEFT-IRpre-irradiation graftingwater states |
| spellingShingle | Tran Trong Hieu Dinh Hoang Hao Lam Thanh Danh Tran Quang Luan Le Van Man Tran Truc Phuong Huynh Van Phuc Dinh Anh Tuyen Luu Kim Ngoc Pham Duy Tap Tran Investigation of the water states of poly(styrene sulfonic acid) grafted poly(ethylene-co-tetrafluoroethylene) copolymer using FT-IR analysis Vietnam Journal of Science, Technology and Engineering ETFE FT-IR pre-irradiation grafting water states |
| title | Investigation of the water states of poly(styrene sulfonic acid) grafted poly(ethylene-co-tetrafluoroethylene) copolymer using FT-IR analysis |
| title_full | Investigation of the water states of poly(styrene sulfonic acid) grafted poly(ethylene-co-tetrafluoroethylene) copolymer using FT-IR analysis |
| title_fullStr | Investigation of the water states of poly(styrene sulfonic acid) grafted poly(ethylene-co-tetrafluoroethylene) copolymer using FT-IR analysis |
| title_full_unstemmed | Investigation of the water states of poly(styrene sulfonic acid) grafted poly(ethylene-co-tetrafluoroethylene) copolymer using FT-IR analysis |
| title_short | Investigation of the water states of poly(styrene sulfonic acid) grafted poly(ethylene-co-tetrafluoroethylene) copolymer using FT-IR analysis |
| title_sort | investigation of the water states of poly styrene sulfonic acid grafted poly ethylene co tetrafluoroethylene copolymer using ft ir analysis |
| topic | ETFE FT-IR pre-irradiation grafting water states |
| url | https://vietnamscience.vjst.vn/index.php/vjste/article/view/326 |
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