Synthesis and characterization of poly(vinyl alcohol) proton exchange membranes modified with 4,4-diaminodiphenylether-2,2-disulfonic acid

Boroğlu, Mehtap Şafak; Çavuş, Selva; Boza, Izabelle; Ata, Ali

doi:10.3144/expresspolymlett.2011.45

Cited by 36 publications

(18 citation statements)

References 27 publications

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“…A typical high molecular weight polyvinyl alcohol by itself is usually not soluble in DMSO below 80 °C . As described by Nakamura, a lower reaction temperature is thermodynamically favorable for the exothermic ketalization of PVAl.…”

Section: Resultsmentioning

confidence: 99%

Ketalization of 2‐heptanone to prolong its activity as mite repellant for the protection of honey bees

et al. 2019

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BACKGROUND 2‐Heptanone is a volatile liquid known to be effective in protecting honey bees from parasitic mite infestations in hives. The present study aimed to show that chemical derivatives of 2‐heptanone would release the ketone for a significantly longer time than it takes for the pure ketone to evaporate and preferably for as long as two brood cycles of a honey bee (42 days). RESULTS A liquid ketal of 2‐heptanone with glycerol (Glyc‐Ket) and solid ketals of the ketone with polyvinyl alcohol (PVAl‐Ket), containing different amounts of the ketone, were synthesized. The fully resolved 1H and 13C nuclear magenetic resonance (NMR) spectra of the ketals are discussed. In the case of the polymer, differential scanning calorimetry (DSC) of a ketal was also compared with the unketalized polyvinyl alcohol. The length of time for which 2‐heptanone was released by the ketals was determined by gas chromatography‐mass spectrometry of the headspace. In the case of Glyc‐Ket, the concentration of the 2‐heptanone in the liquid phase was also monitored by 1H NMR spectroscopy. The deketalization was pH dependent, ranging between 2.0 and 2.5 for Glyc‐Ket and between 2.0 and 3.5 for PVAl‐Ket. CONCLUSION Under bee hive conditions, the release of 55 mmol 2‐heptanone from Glyc‐Ket lasted for 42 days, whereas the release of the ketone from the PVAl‐Ket with a similar amount of the ketone lasted for 23 days, versus a maximum of 17 days for an equivalent amount of the pure ketone. These ketals therefore have the potential to be effective mite repellants for the protection of honey bees. © 2019 Society of Chemical Industry

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Section: Resultsmentioning

confidence: 99%

Ketalization of 2‐heptanone to prolong its activity as mite repellant for the protection of honey bees

et al. 2019

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“…Afterwards, samples of membranes were immersed in de‐ionized water for 24 h; then, these samples were carefully wiped with a filter paper in order to remove the water excess. They were weighed and thereafter, each membrane sample was dried in an oven at 40 °C for 7 h. The water uptake was calculated using the following equation:

Water uptake = \frac{W_{wet} - W_{dry}}{W_{wet}} \times 100

where W wet is the mass of the fully hydrated membrane (g) and W dry the mass of the dried membrane (g).…”

Section: Resultsmentioning

confidence: 99%

Treatment of Crystal Violet from Synthetic Solution Using Membranes Doped with Natural Fruit Extract

Căprărescu

Miron

Purcar

et al. 2018

CLEAN Soil Air Water

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Innovative polymer membranes with and without natural fruit extract (rosehip) are characterized in terms of their ability of treating a solution containing Crystal violet by a three‐compartment laboratory scale electro‐dialysis cell. Electro‐dialysis is performed at different time intervals and using a constant voltage of 15 V. The dye removal percentage (%) and energy consumption are calculated. The highest value of dye removal is obtained for 90 min (>96%) for membranes doped with natural fruit extract. Water uptake is also determined for the prepared membranes. The physical and chemical properties of the final membranes are investigated by Fourier transform infrared (FTIR) spectroscopy, scanning electron microscopy (SEM), and thermal gravimetric analysis‐differential scanning calorimetry (TGA‐DSC). FTIR spectra indicated no significant modifications of membrane structure due to the small amount of natural fruit extract. The surface morphology shows that the prepared membranes doped with natural fruit extract is more dense and compact. TGA results shows that the prepared membranes are stable up to 330 °C.

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“…Membranes, conceived by immobilizing 4,4-diaminodiphenylether-2,2-disulfonic acid (ODADS) onto PVA (MW = 72 kDa, Hy = 99.5%), were evaluated in proton exchange for direct methanol fuel cell (DMFC) [30] . It was claimed that ODADS was indeed part of the PVA matrix without indicating how.…”

Section: Membrane Fuel Cellsmentioning

confidence: 99%

Review: Poly(vinyl alcohol) Functionalizations and Applications

Moulay

2015

Polymer-Plastics Technology and Engineering

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Functionalizations of poly(vinyl alcohol) (PVA) congruent with the desired applications are herein discussed. The chemical modifications of PVA with different molecular weights and hydrolysis degrees via conventional chemistries, namely esterification, carbamation, etherification, and via the modern ones such as click chemistry, led to finished materials with a wide range of applications and uses: membrane fuel cells, biologicals and biomedicals, adsorption of heavy metals and other contaminants, molecular sensing or chemosensor for detection of some useful molecules or toxic ones, separation of mixtures, catalysis in organic and inorganic syntheses. Different forms of the duly modified PVAs were employed in such applications, including: hydrogels, films, membranes, and nanoparticles. The incorporated modifying agents onto PVA matrixes brought some changes that were in tune with the projected applications. These modifying agents were not confined to molecular compounds but also to macromolecular ones which are graphene, hyaluronic acid, β-cylcodextrin, polystyrene, poly(4-vinylpyridine), and poly(L-lactic acid). Downloaded by [University of Cambridge] at 07:33 23 August 2015 2

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Synthesis and characterization of poly(vinyl alcohol) proton exchange membranes modified with 4,4-diaminodiphenylether-2,2-disulfonic acid

Cited by 36 publications

References 27 publications

Ketalization of 2‐heptanone to prolong its activity as mite repellant for the protection of honey bees

Ketalization of 2‐heptanone to prolong its activity as mite repellant for the protection of honey bees

Treatment of Crystal Violet from Synthetic Solution Using Membranes Doped with Natural Fruit Extract

Review: Poly(vinyl alcohol) Functionalizations and Applications

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