Thermal characterization by DSC and TGA analyses of PVA hydrogels with organic and sodium MMT

Reguieg, Fatiha; Ricci, Lucia Battaglia; Bouyacoub, Nabahat; Belbachir, Mohammed; Bertoldo, Monica

doi:10.1007/s00289-019-02782-3

Cited by 83 publications

(68 citation statements)

References 34 publications

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“…Amplitude sweep measurements ( Figure 8 a) showed that even in the case of composite hydrogels, the viscoelastic properties were kept constant over a wide range of deformation (10 −5 –10 −1 ), and therefore no appreciable decrease in elasticity (narrowing of LVER) with increasing amount of MMT was noticed. The frequency sweep measurements ( Figure 8 b, Table 7 ) showed that G′ was higher than G″ over the whole frequency range investigated, thus demonstrating the crosslinked character of the hydrogels [ 32 , 33 , 34 ].…”

Section: Resultsmentioning

confidence: 97%

The Effects of Monomer, Crosslinking Agent, and Filler Concentrations on the Viscoelastic and Swelling Properties of Poly(methacrylic acid) Hydrogels: A Comparison

et al. 2021

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The present work aims at comparatively studying the effects of the concentrations of a monomer (10–30 wt% based on the whole hydrogel composition), crosslinking agent (1–3 mol% based on the monomer), and reinforcing agent (montmorillonite–MMT, 1–3 wt.% based on the whole hydrogel composition) on the swelling and viscoelastic properties of the crosslinked hydrogels prepared from methacrylic acid (MAA) and N,N′-methylenebisacrylamide (BIS) in the presence of K2S2O8 in aqueous solution. The viscoelastic measurements, carried out on the as-prepared hydrogels, showed that the monomer concentration had the largest impact, its three-time enhancement causing a 30-fold increase in the storage modulus, as compared with only a fivefold increase in the case of the crosslinking agent and 1.5-fold increase for MMT in response to a similar threefold concentration increase. Swelling studies, performed at three pH values, revealed that the water absorption of the hydrogels decreased with increasing concentration of both the monomer and crosslinking agent, with the amplitude of the effect of concentration modification being similar at pH 5.4 and 7.4 in both cases, but very different at pH 1.2. Further, it was shown that the increased pH differently influenced the swelling degree in the case of the hydrogel series in which the concentrations of the monomer and crosslinking agent were varied. In contrast to the effect of the monomer and crosslinking agent concentrations, the increase in the MMT amount in the hydrogel resulted in an increased swelling degree at pH 5.4 and 7.4, while at pH 1.2, a slight decrease in the water absorption was noticed. The hydrogel crosslinking density determinations revealed that this parameter was most affected by the increase in the monomer concentration.

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Section: Resultsmentioning

confidence: 97%

The Effects of Monomer, Crosslinking Agent, and Filler Concentrations on the Viscoelastic and Swelling Properties of Poly(methacrylic acid) Hydrogels: A Comparison

et al. 2021

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“…For PVA, all FT-IR spectra showed most of the characteristic infrared absorption bands (spectra not shown). The spectrum showed a broad band at around 3270 cm −1 , which was attributed to inter- and intramolecular hydrogen bonds of -OH groups in PVA [ 25 ]. After crosslinking, this band showed a significant shift to 3400 cm −1 caused by the chemical reaction, demonstrating a polymer structural change.…”

Section: Resultsmentioning

confidence: 99%

“…For all formulations, a first thermal effect with a maximum decomposition rate from 137 to 142 °C and an associated mass loss from 8.8% to 12.7% were observed. This effect is related to the evaporation of the bound and unbound water of the films [ 25 ]. The thermal degradation of crosslinked films occurred in three temperature regions for PGAH and PAAH, but in four regions for PSAH.…”

Section: Resultsmentioning

confidence: 99%

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Sustained Release of Linezolid from Prepared Hydrogels with Polyvinyl Alcohol and Aliphatic Dicarboxylic Acids of Variable Chain Lengths

et al. 2020

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A series of hydrogels with a specific release profile of linezolid was successfully synthesized. The hydrogels were synthesized by cross-linking polyvinyl alcohol (PVA) and aliphatic dicarboxylic acids, which include succinic acid (SA), glutaric acid (GA), and adipic acid (AA). The three crosslinked hydrogels were prepared by esterification and characterized by equilibrium swelling ratio, infrared spectroscopy, thermogravimetric analysis, mechanical properties, and scanning electron microscopy. The release kinetics studies of the linezolid from prepared hydrogels were investigated by cumulative drug release and quantified by chromatographic techniques. Mathematical models were carried out to understand the behavior of the linezolid release. These data revealed that the sustained release of linezolid depends on the aliphatic dicarboxylic acid chain length, their polarity, as well as the hydrogel crosslinking degree and mechanical properties. The in vitro antibacterial assay of hydrogel formulations was assessed in an Enterococcus faecium bacterial strain, showing a significant activity over time. The antibacterial results were consistent with cumulative release assays. Thus, these results demonstrated that the aliphatic dicarboxylic acids used as crosslinkers in the PVA hydrogels were a determining factor in the antibiotic release profile.

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“…PVA is a hydrophilic synthetic polymer with semi-crystalline, planar zigzag structure, and sound mechanical properties [40][41][42][43]. PVA is chemically and thermally stable [44] and is resistant to degradation under most physiological environments [41].…”

Section: Abstract a R T I C L E I N F O R M A T I O Nmentioning

confidence: 99%

A review of Polyvinyl alcohol / Carboxiy methyl cellulose (PVA/CMC) composites for various applications

khoramabadi

Arefian

Hojjati

et al. 2020

jcc

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Polyvinyl alcohol/carboxymethyl cellulose (PVA/CMC) composites have attracted considerable attention due to the synergic relation between the two polymers and developing novel blends with improved properties. On one hand, PVA is a versatile polymer with higher mechanical properties compared to CMC. On the other hand, CMC has high biodegradability and biocompatibility, while suffering from poor mechanical properties. Therefore, the blending of the two polymers can help to benefit from the individual component properties. This paper has reviewed the properties and potential applications (e.g. drug delivery, food packaging, and agriculture) of the PVA/ CMC composites.

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Thermal characterization by DSC and TGA analyses of PVA hydrogels with organic and sodium MMT

Cited by 83 publications

References 34 publications

The Effects of Monomer, Crosslinking Agent, and Filler Concentrations on the Viscoelastic and Swelling Properties of Poly(methacrylic acid) Hydrogels: A Comparison

The Effects of Monomer, Crosslinking Agent, and Filler Concentrations on the Viscoelastic and Swelling Properties of Poly(methacrylic acid) Hydrogels: A Comparison

Sustained Release of Linezolid from Prepared Hydrogels with Polyvinyl Alcohol and Aliphatic Dicarboxylic Acids of Variable Chain Lengths

A review of Polyvinyl alcohol / Carboxiy methyl cellulose (PVA/CMC) composites for various applications

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