Sorption and Desorption of PVA-Pyrene Chains in and out of Agarose Gel

Kara, Selim; Gacal, Burçin; Tunc, Deniz; Yaǧcı, Yusuf; Pekcan, Önder

doi:10.1007/s10895-012-1045-1

Cited by 7 publications

(6 citation statements)

References 37 publications

(48 reference statements)

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“…The tosyl and azide groups were introduced in the PVA polymer chain using pyridine and DMF as solvent [8,9]. Tosyl moiety is an excellent leaving group in nucleophilic substitution reactions and can, for instance, be substituted by halogens, azide, or amines.…”

Section: Introductionmentioning

confidence: 99%

Chemical Modification of Poly(Vinyl Alcohol) in Water

2015

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Partial chemical modification of poly(vinyl alcohol) (PVA) was performed through tosylation followed by azidation. Amine functional PVA was also prepared by grafting propargylamine using click chemistry reaction. Through this approach, a tosyl group (a good leaving group), azide group (a group used in click chemistry) and amine group (a group used for amidation) were attached to PVA polymer chains. The three chemical modifications were performed in water. FTIR and XPS analysis confirmed the chemical modification after each step. Thermogravimetric analysis (TGA) was used to study the thermal stability of the modified PVA.

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Section: Introductionmentioning

confidence: 99%

Chemical Modification of Poly(Vinyl Alcohol) in Water

2015

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“…The process of MB diffusing into the film could be treated with the Fickian diffusion model. The equation for diffusion is expressed as follows:

ln true(1 - \frac{I_{u l}}{I_{u l \infty}} true) = \ln true(\frac{8}{π^{2}} true) - \frac{D π^{2}}{d^{2}} t

where I ul and I ul ∞ are the adsorbances from the absorbed MB molecules at time t and ∞, respectively (i.e., when the intensity approached a constant value), and were obtained with UV–vis measurements and d is the thickness of the film. D is the diffusion coefficient and the produced diffusion coefficients ( D s ) are listed in Table .…”

Section: Resultsmentioning

confidence: 99%

“…The process of MB diffusing into the film could be treated with the Fickian diffusion model. The equation for diffusion is expressed as follows: 45,46 ln 12…”

Section: Loading Of Mbmentioning

confidence: 99%

Layer‐by‐layer assembled hydrogel nanocomposite film with a high loading capacity

Yuan

et al. 2013

J of Applied Polymer Sci

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The layer‐by‐layer assembly technique is a method that widely used in the preparation of nanostructured multilayer ultrathin films. We fabricated a hydrogel nanocomposite film by alternating the deposition of a core–shell poly[(dimethylimino)(2‐hydroxy‐1,3‐propanedily) chloride] (PDMIHPC)–laponite solution and poly(acrylic acid). The growth of the deposition procedure was proven by ultraviolet–visible spectroscopy and spectroscopic ellipsometry. The surface morphology of the films was observed by scanning electron microscopy. The films could reversibly load and release methylene blue (MB) dye, which was used as an indicator. It took about 4.5 h to reach loading equilibrium at pH 9.0. The loading capacity of the film for MB was as large as 4.48 μg/cm2 per bilayer because of the introduction of the core–shell PDMIHPC–laponite as a film component. Nearly 90% of MB was released at pH 3.0 or in a 300 mM NaCl solution within 2.5 h. The loading and release processes were greatly influenced by the ionic strength and pH value of the MB solution. The hydrogel nanocomposite film showed good pH‐triggered loading‐release reversibility and suggested potential applications in controlled drug‐delivery systems and smart materials. © 2013 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2014, 131, 39352.

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“…Kara et al [107] investigated the diffusion of the pyrene-PVA through agarose gel by virtue of its fluorescent property and water solubility. In both sorption and desorption, two kinds of diffusion occurred, coined short time diffusion (D s ) and long time diffusion (D l ) which were characterized by two diffusion coefficients.…”

Section: Adsorption and Separationmentioning

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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Sorption and Desorption of PVA-Pyrene Chains in and out of Agarose Gel

Cited by 7 publications

References 37 publications

Chemical Modification of Poly(Vinyl Alcohol) in Water

Chemical Modification of Poly(Vinyl Alcohol) in Water

Layer‐by‐layer assembled hydrogel nanocomposite film with a high loading capacity

Review: Poly(vinyl alcohol) Functionalizations and Applications

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