Polymer Rheology and Processing of Nano- and Micro-Composites

Pamies, Ramón

doi:10.3390/ma15207297

Cited by 2 publications

(1 citation statement)

References 26 publications

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“…The physical properties of LDH/polymer nanocomposites have been significantly improved recently [3,4]. The use of layered nanofillers as reinforcements in plastic materials increases flammability resistance and improves modulus impact strength and barrier properties of the resultant composite material [5][6][7].…”

Section: Introductionmentioning

confidence: 99%

Improvement of Age-Resistance of LDPE-Based Nanocomposite Films by Addition of a Modified Layered Double Hydroxide with an Anionic UV Screener

Monzó,

Arribas,

Carrión-Vilches

et al. 2023

J. Compos. Sci.

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In this study, we prepared plastic films composed of modified layered double hydroxides (LDHs), which were incorporated into a low-density polyethylene (LDPE) matrix. The sunscreen additive sulfonic phenylbenzimidazole acid sodium salt was incorporated as counter-anion in the interlayer of a nanoclay by means of ion-exchange reactions to improve thermal and optical properties. The modified LDHs were characterized using FT-IR, XRF, TGA, and XRD techniques. Cast extrusion was employed to obtain the nanocomposites with the new LDH incorporated into LDPE. The mechanical, rheological, and optical properties of the films were assessed, and the influence of a non-ionic surfactant was also evaluated. In addition, accelerated ageing tests were carried out to evaluate the influence of UV light on the mechanical and optical properties of the films.

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Section: Introductionmentioning

confidence: 99%

Improvement of Age-Resistance of LDPE-Based Nanocomposite Films by Addition of a Modified Layered Double Hydroxide with an Anionic UV Screener

Monzó,

Arribas,

Carrión-Vilches

et al. 2023

J. Compos. Sci.

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Analysis of Structural Changes of pH–Thermo-Responsive Nanoparticles in Polymeric Hydrogels

Ruiz-Virgen,

Hernandez-Martinez,

Martínez-Mejía

et al. 2024

Gels

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The pH- and thermo-responsive behavior of polymeric hydrogels MC−co−MA have been studied in detail using dynamic light scattering DLS, scanning electron microscopy SEM, nuclear magnetic resonance (1H NMR) and rheology to evaluate the conformational changes, swelling–shrinkage, stability, the ability to flow and the diffusion process of nanoparticles at several temperatures. Furthermore, polymeric systems functionalized with acrylic acid MC and acrylamide MA were subjected to a titration process with a calcium chloride CaCl2 solution to analyze its effect on the average particle diameter Dz, polymer structure and the intra- and intermolecular interactions in order to provide a responsive polymer network that can be used as a possible nanocarrier for drug delivery with several benefits. The results confirmed that the structural changes in the sensitive hydrogels are highly dependent on the corresponding critical solution temperature CST of the carboxylic (–COOH) and amide (–CONH2) functional groups and the influence of calcium ions Ca2+ on the formation or breaking of hydrogen bonds, as well as the decrease in electrostatic repulsions generated between the polymer chains contributing to a particle agglomeration phenomenon. The temperature leads to a re-arrangement of the polymer chains, affecting the viscoelastic properties of the hydrogels. In addition, the diffusion coefficients D of nanoparticles were evaluated, showing a closeness among with the morphology, shape, size and temperature, resulting in slower diffusions for larger particles size and, conversely, the diffusion in the medium increasing as the polymer size is reduced. Therefore, the hydrogels exhibited a remarkable response to pH and temperature variations in the environment. During this research, the functionality and behavior of the polymeric nanoparticles were observed under different analysis conditions, which revealed notable structural changes and further demonstrated the nanoparticles promising high potential for drug delivery applications. Hence, these results have sparked significant interest in various scientific, industrial and technological fields.

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Polymer Rheology and Processing of Nano- and Micro-Composites

Abstract: The development of new technologies strongly depends on the design of new materials [...]

Cited by 2 publications

References 26 publications

Improvement of Age-Resistance of LDPE-Based Nanocomposite Films by Addition of a Modified Layered Double Hydroxide with an Anionic UV Screener

Improvement of Age-Resistance of LDPE-Based Nanocomposite Films by Addition of a Modified Layered Double Hydroxide with an Anionic UV Screener

Analysis of Structural Changes of pH–Thermo-Responsive Nanoparticles in Polymeric Hydrogels

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