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Alkali-Grafting Proton Exchange Membranes Based on Co-Grafting of α-Methylstyrene and Acrylonitrile into PVDF
| Content Provider | MDPI |
|---|---|
| Author | Li, Shufeng Li, Xuelin Fu, Pengfei Zhang, Yao |
| Copyright Year | 2022 |
| Description | A novel alkali-induced grafting polymerization was designed to synthesize a PFGPA proton exchange membrane based on the co-grafting of α-methyl styrene (AMS) and acrylonitrile (AN) into the poly(vinylidenedifluoride) (PVDF) membrane. Three kinds of alkali treatments were used: by immersing the PVDF membranes into a 1 M NaOH solution and mixing the PVDF powders with 16% or 20% $Na_{4}SiO_{4}$. Then, AMS with AN could be co-grafted into the PVDF backbones in two grafting solvents, THF or IPA/water. Finally, the grafted membranes were sulfonated to provide the PFGPA membranes. In the experiments, the $Na_{4}SiO_{4}$ treatments showed a greater grafting degree than the NaOH treatment. The grafting degree increased with the increasing amount of $Na_{4}SiO_{4}$. The grafting solvent also influenced the grafting degree. A 40–50 percent grafting degree was obtained in either the THF or IPA/water solvent after the $Na_{4}SiO_{4}$ treatment and the THF resulted in a greater grafting degree. FTIR and XPS testified that the PFGPA membranes had been prepared and a partial hydrolysis of the cyano group from AN occurred. The PFGPA membranes with the grafting degree of about 40–50 percent showed a better dimensional stability in methanol, greater water uptake capabilities, and lower ion exchange capacities and conductivities than the Nafion 117 membranes. The PFGPA membrane with the 16% $Na_{4}SiO_{4}$ treatment and THF as the grafting solvent exhibited a better chemical stability. The obtained experimental results will provide a guide for the synthesis of alkali-grafted PFGPA membranes in practical use. |
| Starting Page | 2424 |
| e-ISSN | 20734360 |
| DOI | 10.3390/polym14122424 |
| Journal | Polymers |
| Issue Number | 12 |
| Volume Number | 14 |
| Language | English |
| Publisher | MDPI |
| Publisher Date | 2022-06-15 |
| Access Restriction | Open |
| Subject Keyword | Polymers Polymer Science Pvdf Alkali-grafting Α-methyl Styrene Acrylonitrile Proton Exchange Membrane |
| Content Type | Text |
| Resource Type | Article |
