Preparation and Characterization of Hydrogel Based on Poly(vinyl alcohol) Cross-Linked by Different Cross-Linkers Used to Dry Organic Solvents

Al-Sabagh, A.M.; Abdeen, Z.

doi:10.1007/s10924-010-0200-5

Cited by 28 publications

(26 citation statements)

References 28 publications

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“…This in turn requires a photon of lower energy, which translates to an absorption peak at lower frequency in the infrared spectrum of the scaffolds. The presence of two peaks at 1720 to 1723 cm À1 indicated stretching of C]O and at 1655 to 1640 cm À1 indicated presence of the residual vinyl acetate groups in the PVA chains (C]C) and the traces of water molecule (bending vibration) [25]. The highly reduced of the absorption peaks in PBS medium showed the occurrence of hydrolysis of PVA led to hydrolytic cleavage of polymer backbone.…”

Section: Atr-ftir Spectra Analysismentioning

confidence: 99%

In vitro degradation study of novel HEC/PVA/collagen nanofibrous scaffold for skin tissue engineering applications

Zulkifli

Hussain

Rasad

et al. 2014

Polymer Degradation and Stability

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a b s t r a c tThe aim of this study was focused on the degradation behavior of electrospun (hydroxyethyl cellulose/ poly(vinyl) alcohol) HEC/PVA and HEC/PVA/collagen nanofibrous scaffolds, as a potential substrates for skin tissue engineering in two biologically related media: phosphate buffered solution (PBS) and Dulbecco's modified Eagle's medium (DMEM) for 12 weeks incubation period. The scaffolds were characterized at different degradation times by a series of analysis including pH changes of solutions, weight loss, swelling ratio, SEM, ATR-FTIR, DSC, TGA and mechanical properties. The results indicated that HEC/ PVA/collagen scaffolds were exhibited slower degradation rate in both medium as compared to HEC/PVA blend nanofibers. All fibers displayed uneven and rough surfaces towards the final week of incubation in both PBS and DMEM solution. As degradation time increased, there were little changes in the chemical structure as determined by FTIR spectra while thermal studies revealed that the melting temperatures and crystallinity of scaffolds were slightly shifted to a lower value. Both HEC/PVA and HEC/PVA/collagen fibers showed significant decrease in Young's modulus and tensile stress over 12 weeks degradation. These results show that these nanofibrous scaffold demonstrate degradation behavior that meets the requirement as potential degradable biomaterials for dermal replacement.

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Section: Atr-ftir Spectra Analysismentioning

confidence: 99%

In vitro degradation study of novel HEC/PVA/collagen nanofibrous scaffold for skin tissue engineering applications

Zulkifli

Hussain

Rasad

et al. 2014

Polymer Degradation and Stability

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“…The amounts and the ratio of the pore-forming agents are the important factors which decide the aperture uniformity and size distribution, and the elasticity of the foams. The infrared spectra of PVA crosslinked (CPVA) [16] and crosslinked PVA foam (CPVAF) are represented in Figure 1A and 1B, respectively. FTIR spectra shows broad peak at 3440 to 3100 cm -1 reveals stretching vibrations of the hydroxyl groups and the peak at 2940 to 2900 cm -1 is due to C-H stretching vibrations.…”

Section: Hydrogels Characterizationmentioning

confidence: 99%

“…These peaks are very weak in spectra of CPVAF due to the more crosslinked hydrogels, than in the CPVA one. The peak around 1095 cm -1 denotes C-O stretching of the secondary alcoholic groups [16]. The swelling behaviors of the chemically crosslinked CPVA [20] and CPVAF carriers, pH (7) at 30 o C were represented in Figures 2 and 3.…”

Section: Hydrogels Characterizationmentioning

confidence: 99%

“…Microbial cells can be immobilized on various hydrophilic polymeric entrapment matrices such as hydrogels [13]. Among hydrophilic polymers, poly (vinyl alcohol) PVA, poly (hydroxyethylmetacrylate) PHEMA and others, are the most often used for hydrogel's synthesis [14][15][16][17]. Poly (vinyl alcohol) (PVA) is a water-soluble material that has been widely used for immobilization of bioactive materials [18].…”

Section: Introductionmentioning

confidence: 99%

“…Epichlorohydrin was then used as a chemical crosslinking agent to form network structures as well as to improve the foam's stability. Further investigation has revealed the desirable properties of crosslinked Preparation of PVA hydrogel crosslinked by epichlorohydrin (CPVA) [16] CPVA was prepared by adding PVA to 100 ml of distilled water and blending by a mechanical stirrer in a boiling water bath for 1 h. After the mixture cooled to room temperature, stoichiometric amounts of each of epichlorohydrin (EP) as the crosslinker and potassium hydroxide solution were added separately to the mixture with stirring it gently, at 35°C for 2 h. The amount ratios of PVA/E/KOH were: 100/20/25, 100/60/65, 100/100/105 and 100/125/130, 100/140/150. Five CPVA hydrogel disc samples were prepared.…”

Section: Introductionmentioning

confidence: 99%

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Enhancement of Crude Oil Biodegradation by Immobilizing of different Bacterial Strains on Porous PVA Hydrogels or Combining of them with their produced Biosurfactants

Abdeen¹,

El-Sheshtawy²,

Ymm³

2014

J Pet Environ Biotechnol

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The degradation of the crude oil in wastewater by each of freely microorganisms and by immobilized them on each of crosslinked poly (vinyl alcohol) hydrogel (CPVA) and its foam (CPVAF) was reported. Also, it was studied by using biosurfactants (Bio s ) with free cells. The macroporous CPVAF was prepared by adding CaCO 3 as poreforming agent and epichlorohydrin as crosslinker. The prepared polymers are examining by FTIR, XRD, TGA, DSC and SEM analysis. The microorganisms of B.l., R.e. and P.x. isolated from contaminated effluents were investigated. The ability of these microorganisms to degrade the n-paraffin and PAHs was assessed by GC and HPLC analysis, respectively. Moreover, their stabilities and activities were tested in the growth count of bacteria study. The crosslinked CPVA carrier demonstrated better thermal stability and improvement in the microorganism efficiency with respect to hydrocarbons degradation than these of the CPVAF carrier. Scanning electron microscopy showed the presence of extracellular structures that could play an important role in the immobilization stability of cells on polymers. As well, GC analysis revealed that the percentage biodegradation ability of immobilized cells R.e. on CPVAF for the total n-paraffin was approximately, 100%. While, the HPLC analysis showed that the percentage biodegradation of cells for PAHs was enhancement by immobilized them on CPVA and also, at adding Bio s to them. The results suggest that the potential of using each of CPVA, PVAF as cell carriers and Bio s separately, to free cells to enhancing the biodegradation of petroleum hydrocarbons in an open marine environment.

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Water and Dye Uptake Studies of Acrylamide/4‐Styrenesulfonic Acid Sodium Salt Copolymers and Semi‐Interpenetrating Polymer Networks Composed of Gelatin and/or PVA

Karadağ

Kundakcı

2012

Adv Polym Technol

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Gelatin (GEL) and poly(vinyl alcohol) (PVA) based semi-interpenetrating polymer network (semi-IPN) hydrogels were prepared as a water adsorbent for cationic dye (methyl violet, MV) sorption. For this case, chemically cross-linked copolymer of an acrylamide/4-styrenesulfonic acid sodium salt (AAm/SSS) copolymer with PVA and/or GEL was prepared by polymerization of aqueous solution of acrylamide (AAm) and 4-styrenesulfonic acid sodium salt (SSS) using ammonium persulfate/N,N,N',N'-tetramethylethylenediamine as a redox initiating pair in the presence of poly(ethylene glycol)diacrylate as a cross-linker. FT-IR analysis was used to identify the presence of different repeating units in the semi-IPNs. Surface morphology was characterized by using a scanning electron microscopy technique. Some swelling and diffusion characteristics were calculated for

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Preparation and Characterization of Hydrogel Based on Poly(vinyl alcohol) Cross-Linked by Different Cross-Linkers Used to Dry Organic Solvents

Cited by 28 publications

References 28 publications

In vitro degradation study of novel HEC/PVA/collagen nanofibrous scaffold for skin tissue engineering applications

In vitro degradation study of novel HEC/PVA/collagen nanofibrous scaffold for skin tissue engineering applications

Enhancement of Crude Oil Biodegradation by Immobilizing of different Bacterial Strains on Porous PVA Hydrogels or Combining of them with their produced Biosurfactants

Water and Dye Uptake Studies of Acrylamide/4‐Styrenesulfonic Acid Sodium Salt Copolymers and Semi‐Interpenetrating Polymer Networks Composed of Gelatin and/or PVA

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