Preparation and characterization of soy lecithin-modified bentonites

Merino, Danila; Ollier, Romina P.; Lanfranconi, Matías; Álvarez, Vera A.

doi:10.1016/j.clay.2016.04.006

Cited by 34 publications

(34 citation statements)

References 38 publications

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“…It could also be expected that the main absorption bands of CS and Bent appear in the spectra. The pure CS presents bands at 3450 cm −1 (O‐H and N‐H stretch), 1594–1663 cm −1 (amine groups) and 1410 cm −1 (carboxyl groups), while Bent shows its main bands centered on 3641 cm −1 (structural O–H groups), 3440 and 1656 cm −1 (stretching of O–H groups from free and adsorbed water) and 1004 cm −1 (Si‐O in flat vibration) . However, they were not observed in the spectra, probably due to the small amount introduced as nanofillers (4% w/w) …”

Section: Resultsmentioning

confidence: 99%

“…Natural bentonite was acquired from Minarmco S.A. (Neuquén, Argentina) and used as nanofiller. Its chemical composition was previously reported by our research group elsewhere . Glycerol (Aurum, Mar del Plata, Argentina) with purity >99.5% was used as plasticizer in the formulation of all film systems.…”

Section: Methodsmentioning

confidence: 99%

“…Its chemical composition was previously reported by our research group elsewhere. [16] Glycerol (Aurum, Mar del Plata, Argentina) with purity >99.5% was used as plasticizer in the formulation of all film systems. The modifications on starch and Bent nanofillers are described below.…”

Section: Methodsmentioning

confidence: 99%

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Structural and Thermal Properties of Agricultural Mulch Films Based on Native and Oxidized Corn Starch Nanocomposites

2019

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The current need to put an end to the accumulation of synthetic polymer waste during the cultivation and harvest of food has promoted scientific research for the development of biodegradable agricultural mulch films. Native and oxidized thermoplastic corn starch, with and without the addition of natural and modified bentonite (Bent) with an eco‐friendly natural polymer such as chitosan (CS) are proposed as an alternative for this field. The hydrogen‐bonding interactions affecting the structural and thermal properties of the designed films are followed and analyzed by Fourier transform infrared spectroscopy (FTIR), X‐ray diffraction (XRD), thermogravimetric analysis (TGA), differential scanning calorimetry (DSC), and rheometry. Results indicate that chemical modification carried out onto starch's structure leads to a reduction in the OH polar groups, which affects their films interaction with nano‐clays and glycerol. Besides, nanocomposites which present an intercalated structure demonstrate less effective intercalation when oxidized starch is used as the matrix. Additionally, a higher degree of crystallinity is observed, which could indicate a lower degree of compatibility between polymer and plasticizer. Thermal characterization confirms that the glass transition temperature of plasticized corn starch increases when oxidation is performed due to the decreased compatibility between the plasticizer agent and the oxidized corn starch.

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Section: Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

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Structural and Thermal Properties of Agricultural Mulch Films Based on Native and Oxidized Corn Starch Nanocomposites

2019

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“…As it has been reported in our previous work, [22] three SL-modified bentonites were prepared to be used as fillers of PCL. Briefly, a Bent dispersion was mixed with a SL solution, heated at 75 C and stirred for 2 hours.…”

Section: Nanoclays Preparationmentioning

confidence: 99%

“…During the last decade, many studies related to the crystallization of PCL nanocomposites have been published, [13][14][15][16][17][18][19][20][21][22] and they have shown controversial results regarding the nucleating or retarding effect of PCL modified with several compounds: pure carbon nanotubes and/or functionalized with different chemical agents, [13][14][15] cellulose, [16,17] organoclays, [18] and bamboo fiber. [19] The effects have been studied analyzing different experimental parameters as the changes on the crystallization temperature (increase or decrease), the crystallization rate (higher or lower), the effective energy barrier (increase or reduction), or the half-crystallization time (decrease or increase).…”

Section: Introductionmentioning

confidence: 99%

Non‐isothermal crystallization of poly(ε‐caprolactone) nanocomposites with soy lecithin‐modified bentonite

Merino

Álvarez

Pérez

2018

Polymer Crystallization

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Non‐isothermal crystallization behavior of poly(ε‐caprolactone)/bentonite (natural and soy lecithin‐modified) nanocomposites was studied by means of differential scanning calorimetry (DSC). In addition, a microscopic analysis of cryofracture surface was performed by scanning electron microscopy (SEM). Experimental data show that pure bentonite (Bent) acts as retarding agent and that soy lecithin partially counteracts this effect because it accelerates the crystallization process. The soy lecithin was used as natural and cheap clay modifier that can be used in food contact applications, which is the thought application for the studied materials. Kinetic parameters, obtained by using classical methods such as Avrami and Mo models, were able to partially describe the non‐isothermal crystallization behavior of the studied materials and the results are further supported by the effective activation energy calculations by iso‐conversional method of Friedman. The full models, which take into account the different parameters during cooling under non‐isothermal conditions, were used to construct continuous cooling transformations (CCTs) diagrams that confirm all previous results and that will be used to determine the processing conditions of studied materials.

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Biodegradability and Compostability of Food Nanopackaging Materials

Gutiérrez¹,

José²

2018

Composites Materials for Food Packaging

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Preparation and characterization of soy lecithin-modified bentonites

Cited by 34 publications

References 38 publications

Structural and Thermal Properties of Agricultural Mulch Films Based on Native and Oxidized Corn Starch Nanocomposites

Structural and Thermal Properties of Agricultural Mulch Films Based on Native and Oxidized Corn Starch Nanocomposites

Non‐isothermal crystallization of poly(ε‐caprolactone) nanocomposites with soy lecithin‐modified bentonite

Biodegradability and Compostability of Food Nanopackaging Materials

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