Effect of sepiolite on the physical properties and swelling behavior of rifampicin-loaded nanocomposite hydrogels

Viçosa, Alessandra Lifsitch; Gomes, Ana C. O.; Soares, Bluma G.; Paranhos, Caio Márcio

doi:10.3144/expresspolymlett.2009.64

Cited by 26 publications

(15 citation statements)

References 22 publications

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“…Sepiolite as a filler in nanocomposites has been intensively investigated in recent years. [15][16][17][18][19][20][21][22][23][24][25] For example, a nanocomposite based on sepiolite and gelatin showed a significant improvement in the mechanical properties, such as the Young modulus and compressive collapse strength. 15 Fukushima et al 16 investigated poly(lactic acid) (PLA) and poly(ε--caprolactone) (PCL) composites with sepiolite prepared by melt blending and obtained thermo-mechanical improvements of the PLA and PCL matrices due to the good dispersion and high polymer/filler interaction.…”

Section: Introductionmentioning

confidence: 99%

PVB/sepiolite nanocomposites as reinforcement agents for paper

Janković-Čaštvan¹,

Lazarević²,

Stojanović³

et al. 2016

JSCS

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In order to improve the mechanical properties of paper, 1, 3 and 5 wt. % of sepiolite were dispersed in a poly(vinyl butyral) (PVB) matrix and coated onto the surface of schrenz (110 g m -2 ). Deagglomerated sepiolite nanofibers in the PVB matrix on the paper surface were observed by scanning electron microscopy. The glass transition temperature of schrenz with PVB/sepiolite coatings was not changed with increasing content of sepiolite. Two different methods were used to evaluate the mechanical properties of the paper sample reinforced with PVB/sepiolite nanocomposites: tensile testing and nanoindentation. The values of breaking force and tensile energy absorption of the reinforced paper samples obtained by tensile testing were increased by up 10 %. The values of the reduced elastic modulus and hardness obtained by nanoindentation were increased by up to 78 %. The best improvement of the mechanical properties was shown by the paper sample coated with PVB/3 wt. % sepiolite nanocomposite.

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Section: Introductionmentioning

confidence: 99%

PVB/sepiolite nanocomposites as reinforcement agents for paper

Janković-Čaštvan¹,

Lazarević²,

Stojanović³

et al. 2016

JSCS

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“…Previous studies were mostly focused on the properties of nanocomposites composed of different polymers and sepiolite [20][21][22][23][24][25][26][27][28][29][30] and the effect of sepiolite in polymer matrix. However, polymer/sepiolite nanofiber formation and its properties have not been investigated in detail, yet.…”

Section: Introductionmentioning

confidence: 99%

Properties of biodegradable PVA/sepiolite‐based nanocomposite fiber mats

2014

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In this study, poly(vinyl alcohol) (PVA) nanocomposite fiber mats with sepiolite were prepared via electrospinning technique. The measurements of fourier transform infrared (FTIR) spectroscopy, differential scanning calorimetry (DSC), contact angle, scanning electron microscopy (SEM), and atomic force microscopy (AFM) were used for the characterization. The effect of polymer/sepiolite ratio and heat treatment on the properties of samples was investigated. The heat treatment which decreased the solubility of nanofibers and the addition of sepiolite resulted in a decrease in nanofiber diameter, contact angle with water, and water drop spreading rate on the material, and also resulted in an increase in water drop spreading rate inside the material. POLYM. COMPOS., 36:2334–2342, 2015. © 2014 Society of Plastics Engineers

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“…The related research follows basically two ways: creation of novel type crosslinked structures (double networks, interpenetrating networks etc.) and incorporation of water swellable or dispersible nanofillers (e.g., layered silicates 6 ). Key factors for application of hydrogels in the biomedical area (contact lens, catheter, artificial articular cartilage, artificial esophagus, etc.)…”

Section: Introductionmentioning

confidence: 99%

“…and incorporation of water swellable or dispersible nanofillers (e.g., layered silicates 6 ). Key factors for application of hydrogels in the biomedical area (contact lens, catheter, artificial articular cartilage, artificial esophagus, etc.)…”

Section: Introductionmentioning

confidence: 99%

Swelling, compression and tribological behaviors of bentonite‐modified polyacrylate‐type hydrogels

Korres

Sorochynska

Grishchuk

et al. 2010

J of Applied Polymer Sci

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Hydrogel was synthesized from acrylamide and 2-acryloylamido-2-methylpropanesulfonic acid monomers (ratio: 50/50 wt %) and crosslinked with 0.25 wt % of methylene-bisacrylamide. This hydrogel was also modified by adding 4 wt % of sodium bentonite (NB). Selected properties of the hydrogels with and without NB were investigated and compared. Their water uptake was measured gravimetrically; the compression and compression creep were assessed by dynamic-mechanical and thermo-mechanical analysis (DMA and TMA, respectively) techniques. The friction and wear of the hydrogels were determined in a shaft(metal)-on-plate(hydrogel) type testing configuration under water lubrication. The hydrogel was transparent and exhibited very high equilibrium water content (>99 wt %). The latter was less affected; however, the hydrogel became slightly more hazy after NB incorporation. The crosslink density of the hydrogels was deduced from swelling and compression tests and compared with the theoretical values. Modification by NB enhanced the ultimate compression strength and reduced the related compression strain. The compression creep response under both loading and deloading strongly depended on the level of the initial load. A very low friction coefficient (similar to 0.003) and a relatively high specific wear rate (similar to 0.05 mm(3)/N m) were registered under water lubricated sliding wear using a metallic counterpart with high surface roughness. Scanning electron microscopy combined with energy dispersive spectroscopy delivered additional information on the NB dispersion and surface structure of the hydrogels

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Effect of sepiolite on the physical properties and swelling behavior of rifampicin-loaded nanocomposite hydrogels

Cited by 26 publications

References 22 publications

PVB/sepiolite nanocomposites as reinforcement agents for paper

PVB/sepiolite nanocomposites as reinforcement agents for paper

Properties of biodegradable PVA/sepiolite‐based nanocomposite fiber mats

Swelling, compression and tribological behaviors of bentonite‐modified polyacrylate‐type hydrogels

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