Esterification modification and characterization of polyvinyl alcohol anion exchange membrane for direct methanol fuel cell

Huang, Xingyuan; Wang, Jilin; Wang, Lulu

doi:10.1007/s10965-022-02958-y

Cited by 12 publications

(17 citation statements)

References 45 publications

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“…Compared with M0, there are new adsorption peaks appeared at 786 cm −1 and 668 cm −1 in M0.3. These two characteristic peaks may be due to deformation vibrations when the hydroxyl groups (–OH) contained in PVA and PA interact with the functional group of MXene under the formation of hydrogen bond 41 . XPS shows that except for P (135 eV), C (284 eV), O (532 eV), the characteristic elements of Ti (450 eV) and F (686 eV) arise in M0.3 sample resulting from MXene component.…”

Section: Resultsmentioning

confidence: 99%

Facile fabrication of a novel self-healing and flame-retardant hydrogel/MXene coating for wood

Zhao

Tian

Wei

et al. 2023

Sci Rep

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To improve flame retardancy of wood, a novel high-water-retention and self-healing polyvinyl alcohol/phytic acid/MXene hydrogel coating was developed through facile one-pot heating and freeze–thaw cycle methods, and then painted on wood surface. The coating exhibit excellent self-healing property and significantly enhanced water-retention property (water content ≥ 90 wt%), due to the increased hydrogen bonds within the coating system with the presence of MXene nanosheets. Compared to pristine wood, the flame retardancy of coated wood is greatly improved, such as passed V0 rating in UL-94 test, increasing time to ignition (TTI, from 32 to 69 s), and decreased heat release rate and total heat release by 41.6% and 36.14%. The cooling effect and large thermal capacity of high-water-retention hydrogel, and physical barrier effects for flammable gas products, heat and oxygen by MXene nanosheets and the compact char layer formed during combustion play key roles in the flame retardancy enhancements of the wood. High thermal stability of MXene nanosheets is another beneficial factor. The detailed flame-retardant and self-healing mechanisms were proposed.

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Section: Resultsmentioning

confidence: 99%

Facile fabrication of a novel self-healing and flame-retardant hydrogel/MXene coating for wood

Zhao

Tian

Wei

et al. 2023

Sci Rep

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show abstract

“…Compared with M0, there are new adsorption peaks appeared at 786 cm − 1 and 668cm − 1 in M0.3. These two characteristic peaks may be due to deformation vibrations when the hydroxyl groups (-OH) contained in PVA and PA interact with the functional group of MXene under the formation of hydrogen bond [41]. XPS shows that except for P (135 ev), C (284 ev), O (532 ev), the characteristic elements of Ti (450 ev) and F (686 ev) arise in M0.3 sample resulting from MXene component.…”

Section: Structure Characterizationmentioning

confidence: 99%

Facile fabrication of a novel self-healing and flame- retardant Hydrogel/MXene coating for wood

Zhao

Tian

Wei

et al. 2022

Preprint

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To improve flame retardancy of wood, a novel high-water-retention and self-healing polyvinyl alcohol/phytic acid/MXene hydrogel (M-hydrogel) coating was developed through facile one-pot heating and freeze-thaw cycle methods, and then painted on wood surface. The coating exhibit excellent self-healing property and significantly enhanced water-retention property (water content ≥90 wt%), due to the increased hydrogen bonds within the coating system with the presence of MXene nanosheets. Compared to pristine wood, the flame retardancy of coated wood is greatly improved, such as passed V0 rating in UL-94 test, increasing time to ignition (TTI, from 32 s to 69 s), and decreased heat release rate (HRR) and total release rate (THR) by 41.6% and 36.14%. The cooling effect and large thermal capacity of high-water-retention hydrogel, and physical barrier effects for flammable gas products, heat and oxygen by MXene nanosheets and the compact char layer formed during combustion play key roles in the flame retardancy enhancements of the wood. High thermal stability of MXene nanosheets is another beneficial factor. The detailed flame-retardant and self-healing mechanisms were proposed.

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“…But this problem can be effectively solved through crosslinking and introduction of hydrophobic domains. [15][16][17][18][19][20] In conclusion, PVA based AEM is of great research significance.…”

Section: Introductionmentioning

confidence: 97%

“…In addition, PVA also has the advantages of low cost, easy to get, excellent film-forming performance, good flexibility and so on. [16][17][18][19][20] Therefore, PVA is expected to prepare AEM with high OH À conductivity and high alkaline stability. It is worth mentioning that excessive water absorption may also cause high dimensional swelling of AEM and even lead to electrode flooding, which is the main disadvantage of PVA based AEM at present.…”

Section: Introductionmentioning

confidence: 99%

“…The prepared PVA based AEM exhibits an ionic conductivity of 96.3 mS cm À1 at 80 C. However, unlike the rich variety of cationic reagents used for acetal reaction, the research on the preparation of PVA based AEM by ring opening reaction mainly focuses on improving the performance of the AEM by adding different components, while the research on the modification of PVA by different kinds of cationic functionalized epoxy small molecules is relatively less, which mainly use 2,3-epoxypropyl trimethylammonium chloride (EPTMAC) as quaternization reagent. 17,20,22 For example, Huang et al 17 prepared a series of PVA based AEMs s by using EPTMAC as quaternization reagent, phytic acid (PA) as esterification agent, and 1,4-diglycidyl butane ether as crosslinker. The ionic conductivity of the PVA based AEM prepared can reach 0.594 S cm À1 at 80 C, the power density of the single fuel cell can reach 122 mW cm À2 .…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Different cationic functionalized epichlorohydrin modified polyvinyl alcohol based anion exchange membrane

Jiang

Shen

Chen

et al. 2023

J of Applied Polymer Sci

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Low ionic conductivity and poor alkali resistance have long been the problems of the anion exchange membrane (AEM) of alkaline fuel cell. Herein, epichlorohydrin functionalized by three different cations (piperidine cation, imidazole cation and trimethylammonium cation) are respectively used to modify polyvinyl alcohol (PVA) to prepare a series of PVA based AEMs, and the AEMs are cross‐linked by p‐phthalaldehyde. 1H NMR and FT‐IR spectroscopy confirm the successful functionalization of epichlorohydrin and the successful preparation of the AEMs. The ion exchange capacity, water uptake, swelling ratio, mechanical properties, thermal stability, OH− conductivity, morphology and alkaline stability of the AEMs are assessed and compared. The experimental results suggest that the AEM modified by piperidine cation owns continuous ion channels and obvious microphase separation structure, resulting in an OH− conductivity of 94.13 mS cm−1 at 80°C. And its alkali resistance is also relatively good (87.16%, 360 h). Besides, crosslinking by p‐phthalaldehyde effectively lowers the swelling ratio, increases the thermal stability and improves the mechanical properties of the AEMs.

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Esterification modification and characterization of polyvinyl alcohol anion exchange membrane for direct methanol fuel cell

Cited by 12 publications

References 45 publications

Facile fabrication of a novel self-healing and flame-retardant hydrogel/MXene coating for wood

Facile fabrication of a novel self-healing and flame-retardant hydrogel/MXene coating for wood

Facile fabrication of a novel self-healing and flame- retardant Hydrogel/MXene coating for wood

Different cationic functionalized epichlorohydrin modified polyvinyl alcohol based anion exchange membrane

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