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Characteristics of PVDF Membranes Irradiated by Electron Beam.

Jaleh B, Gavary N, Fakhri P, Muensit N, Taheri SM - Membranes (Basel) (2015)

Bottom Line: The surface hydrophilicity of the modified membrane was characterized by water contact angle measurement.The contact angle decreased compared to the original angle, indicating an improvement of surface hydrophilicity.Filtration results also showed that the pure water flux (PWF) of the modified membrane was lower than that of the unirradiated membrane.

View Article: PubMed Central - PubMed

Affiliation: Department of Physics, Bu-Ali Sina University, Hamedan 65174, Iran. jaleh@basu.ac.ir.

ABSTRACT
Polyvinylidene fluoride (PVDF) membranes were exposed vertically to a high energy electron beam (EB) in air, at room temperature. The chemical changes were examined by Fourier Transform Infrared Spectroscopy (FTIR). The surface morphologies were studied by Scanning Electron Microscopy (SEM) and showed some changes in the pore size. Thermogravimetric (TGA) analysis represented an increase in the thermal stability of PVDF due to irradiation. Electron paramagnetic resonance (EPR) showed the presence of free radicals in the irradiated PVDF. The effect of EB irradiation on the electrical properties of the membranes was analyzed in order to determine the dielectric constant, and an increase in the dielectric constant was found on increasing the dose. The surface hydrophilicity of the modified membrane was characterized by water contact angle measurement. The contact angle decreased compared to the original angle, indicating an improvement of surface hydrophilicity. Filtration results also showed that the pure water flux (PWF) of the modified membrane was lower than that of the unirradiated membrane.

No MeSH data available.


Gel fraction as a function of radiation dose.
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membranes-05-00001-f007: Gel fraction as a function of radiation dose.

Mentions: Since sufficient cross-linking to cause polymer bulk gelation is evidenced by drastic changes in solubility and physico-mechanical behavior, the degree of crosslinking may be determined by the measurement of “gel content” [15]. The gel content of the irradiated sample was measured to quantify the amount of crosslinking induced by irradiation. Figure 7 shows the variation of the gel fraction with the irradiation dose. It was found that the gel fraction increased up to 150 kGy which is due to crosslinking. This is in agreement with the result of the effect of EB irradiation on PVDF film reported in [11]. Conversely, the gel fraction decreases corresponding to the decrease in crosslinking to a constant value at doses greater than 200 kGy. This result is in agreement with the finding of FTIR and TGA analyses.


Characteristics of PVDF Membranes Irradiated by Electron Beam.

Jaleh B, Gavary N, Fakhri P, Muensit N, Taheri SM - Membranes (Basel) (2015)

Gel fraction as a function of radiation dose.
© Copyright Policy
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4384087&req=5

membranes-05-00001-f007: Gel fraction as a function of radiation dose.
Mentions: Since sufficient cross-linking to cause polymer bulk gelation is evidenced by drastic changes in solubility and physico-mechanical behavior, the degree of crosslinking may be determined by the measurement of “gel content” [15]. The gel content of the irradiated sample was measured to quantify the amount of crosslinking induced by irradiation. Figure 7 shows the variation of the gel fraction with the irradiation dose. It was found that the gel fraction increased up to 150 kGy which is due to crosslinking. This is in agreement with the result of the effect of EB irradiation on PVDF film reported in [11]. Conversely, the gel fraction decreases corresponding to the decrease in crosslinking to a constant value at doses greater than 200 kGy. This result is in agreement with the finding of FTIR and TGA analyses.

Bottom Line: The surface hydrophilicity of the modified membrane was characterized by water contact angle measurement.The contact angle decreased compared to the original angle, indicating an improvement of surface hydrophilicity.Filtration results also showed that the pure water flux (PWF) of the modified membrane was lower than that of the unirradiated membrane.

View Article: PubMed Central - PubMed

Affiliation: Department of Physics, Bu-Ali Sina University, Hamedan 65174, Iran. jaleh@basu.ac.ir.

ABSTRACT
Polyvinylidene fluoride (PVDF) membranes were exposed vertically to a high energy electron beam (EB) in air, at room temperature. The chemical changes were examined by Fourier Transform Infrared Spectroscopy (FTIR). The surface morphologies were studied by Scanning Electron Microscopy (SEM) and showed some changes in the pore size. Thermogravimetric (TGA) analysis represented an increase in the thermal stability of PVDF due to irradiation. Electron paramagnetic resonance (EPR) showed the presence of free radicals in the irradiated PVDF. The effect of EB irradiation on the electrical properties of the membranes was analyzed in order to determine the dielectric constant, and an increase in the dielectric constant was found on increasing the dose. The surface hydrophilicity of the modified membrane was characterized by water contact angle measurement. The contact angle decreased compared to the original angle, indicating an improvement of surface hydrophilicity. Filtration results also showed that the pure water flux (PWF) of the modified membrane was lower than that of the unirradiated membrane.

No MeSH data available.