Structure and Properties of Polyamide 11 Nanocomposites Filled with Fibrous Palygorskite Clay

Benobeidallah, Baya; Benhamida, Aida; Dorigato, Andrea; Sola, Antonella; Messori, Massimo; Pegoretti, Alessandro

doi:10.32604/jrm.2019.00136

Cited by 15 publications

(11 citation statements)

References 37 publications

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“…A better lipophilicity of the surfactant led to better dispersibility of palygorskite in the oil [ 12 ]. The chemical surface functionalization with organosilanes (e.g., 3-glycidoxypropyltrimethoxysilane, 3-aminopropyltriethoxysilane, 3-mercaptopropyltrimethoxysilane, alkyl silanes) was also used to better disperse palygorskite and enhance compatibility with several polymeric matrices [ 13 , 14 , 15 ].…”

Section: Introductionmentioning

confidence: 99%

Stabilization of Palygorskite Aqueous Suspensions Using Bio-Based and Synthetic Polyelectrolytes

et al. 2020

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Palygorskite is a natural fibrous clay mineral that can be used in several applications, for which colloidal stability in aqueous suspensions is a key point to improve its performance. In this study, methods of magnetic stirring, high-speed shearing, and ultrasonication, as well as different chemical dispersants, combined with these methods, namely carboxymethylcellulose, alginate, polyphosphate, and polyacrylate, were used to improve the dispersibility and the formation of stable suspensions of palygorskite in different conditions of pH. The stability and particle size of suspensions with a low concentration of palygorskite were evaluated by visual inspection, optical and electron microscopy, dynamic light scattering, and zeta potential measurements. Moreover, the palygorskite used in this work was initially characterized for its mineralogical, chemical, physical, and morphological properties. It was found that more stable suspensions were produced with ultrasonication compared to the other two physical treatments, with magnetic stirring being inefficient in all tested cases, and for higher pH values (pH of 12 and pH of 8, the natural pH of the clay) when compared to lower pH values (pH of 3). Remarkably, combined with ultrasonication, carboxymethylcellulose or in a lesser extent polyphosphate at near neutral pH allowed for the disaggregation of crystal bundles of palygorskite into individualized crystals. These results may be helpful to optimize the performance of palygorskite in several domains where it is applied.

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Section: Introductionmentioning

confidence: 99%

Stabilization of Palygorskite Aqueous Suspensions Using Bio-Based and Synthetic Polyelectrolytes

et al. 2020

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“…From an industrial point of view, polyamides (nylon 6, nylon 6,6, nylon 11, nylon 12, and nylon 6,10) has gained particular interest for the possibility of developing high value added fibers and bulk materials . Thanks to its relative low melting temperature (about 180°C), PA12 represents an interesting replacement for several traditional plastics , and also innovative PA12 based blends and composites have been prepared in the last decades .…”

Section: Introductionmentioning

confidence: 99%

Novel electroactive polyamide 12 based nanocomposites filled with reduced graphene oxide

Dorigato

Pegoretti

2018

Polymer Engineering & Sci

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Novel electroactive nanocomposites were prepared by adding to a polyamide 12 (PA12) matrix different amounts (from 1 to 8 wt%) of reduced graphene oxide (rGO), and the thermo-electrical behavior of the prepared bulk materials was compared with that of the corresponding fibers. FESEM micrographs on bulk materials highlighted an evident aggregation of the rGO lamellae, proportional to the filler concentration. The presence of rGO stacks was responsible of a heavy embrittlement of the samples, with a strong reduction of the elongation at break, and of the limited electrical conductivity of the samples (about 10 5 XÁcm with a rGO amount of 4 wt%). Moreover, nanofiller addition determined an improvement of the thermal degradation resistance, associated to a slight drop of the glass transition temperature (about 78C with a nanofiller concentration of 4 wt%) and of the crystallinity degree (up to 9% for an rGO loading of 4 wt%). The extrusion process adopted to prepare nanocomposite fibers caused a partial breakage of rGO aggregates and their progressive alignment along the drawing direction, determining thus an electrical resistivity increase with respect to the bulk samples. Therefore, the surface heating of the prepared fibers through Joule effect was possible only at elevated rGO amounts (i.e., 8 wt%). POLYM. ENG. SCI., 00:000-000, FIG. 9. Surface temperature evolution of the PA12-rGO-8 fiber with DR 5 3 with an applied voltage of 200 V and 220 V.

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“…The structure and morphology of the nanocomposites can be determined by X-ray diffraction (XRD), both wide angle (WAXS) and small angle (SAXS), scanning electron microscopy (SEM), transmission electr-=on microscopy (TEM), infrared spectroscopy (IR), and atomic force microscopy (AFM) [24,26,27]. Tactoid structures (microcomposites) is obtained when the presence of particles (agglomerates>100 nm) in the material is observed.…”

Section: Fabrication Of Polymer/ Clay Nanocompositesmentioning

confidence: 99%

Application of nanoclays in food packaging

2019

Biointerface Res Appl Chem

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Nanoclays have received special attention due to their wide range of industrial applications due to some inherent properties. Nowadays one of the most active areas of nanoclays research is their employ in food packaging. In this paper, at first, the reasons of nanoclay applications are introduced. Then critical issue in developing food packaging materials are reviewed to minimize gasses and other small molecules transfer between out-side packaging environment and food. The reason for improvement of permeability of films is discussed. The permeability of nanocomposite films may be determined using two factors: diffusion and solubility coefficients. Then antimicrobial activity of clay-based nanocomposites and its mechanism and factors influencing on it are mentioned. The way of evaluation of mechanical properties of the nanocomposite films and strategies for improvement are introduced. Finally, other applications of nanoclays e.g. controlled release of various bioactive molecules and development of reinforced food contact materials have been introduced.

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Structure and Properties of Polyamide 11 Nanocomposites Filled with Fibrous Palygorskite Clay

Cited by 15 publications

References 37 publications

Stabilization of Palygorskite Aqueous Suspensions Using Bio-Based and Synthetic Polyelectrolytes

Stabilization of Palygorskite Aqueous Suspensions Using Bio-Based and Synthetic Polyelectrolytes

Novel electroactive polyamide 12 based nanocomposites filled with reduced graphene oxide

Application of nanoclays in food packaging

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