Biodegradable Polymer/Clay Nanocomposites

Ludueña, Leandro Nicolás; Morán, Juan Ignacio; Álvarez, Vera A.

doi:10.1007/978-81-322-2470-9_4

Cited by 4 publications

(2 citation statements)

References 162 publications

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“…To evaluate the effect of each filler used (BE, NMnt, NMntBE, MMnt and MMntBE), 4% w/w of each was added to the starch content of each film system, maintaining the same glycerol:starch ratio. This percentage was employed based on previous studies carried out by our research group (Ludueña, Mor an, & Alvarez, 2015;Vazquez et al, 2012). Each system was then pre-blended manually until homogeneous mixtures were obtained.…”

Section: Film Formation and Extrusion Conditionsmentioning

confidence: 99%

Bionanocomposite films developed from corn starch and natural and modified nano-clays with or without added blueberry extract

2018

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Edible and bionanocomposite films were developed by extrusion followed by thermo molding. Corn starch (Zea mays), glycerol, and several nano-clays were used as the carbohydrate polymer, plasticizer and nano-fillers, respectively. Pure blueberry (Vaccinium corymbosum) extract (BE, 100% anthocyanin), as well as natural and modified montmorillonites (Mnt) with or without BE nano-packaged within their layers were incorporated into the thermoplastic starch (TPS) matrix. Previous studies by our research group have shown that BE, and BE nano-packaged within natural and modified Mnt, are pH-sensitive. With this in mind, we set out to develop edible and intelligent (pH-sensitive) bionanocomposite films with improved properties. Unfortunately however, none of the films formulated were pH-sensitive. All the films showed X-ray diffractograms typical of semicrystalline, albeit largely amorphous, materials coinciding with the morphological observations made under scanning electron microscopy. The results confirmed that total starch gelatinization occurred under the selected extrusion conditions. Films prepared from corn starch containing BE showed a plasticizing effect, giving materials with lower thermal resistance and surface moisture values, which were also more opaque, denser, and rougher. All the nanofillers tested were completely exfoliated within the TPS matrix, except for the natural Mnt that was partly exfoliated and partly intercalated in the matrix. In general, materials containing nano-fillers with a greater degree of interlayer spacing (more exfoliated) showed higher thermal resistance and Young's modulus, but lower strain at break values.

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Section: Film Formation and Extrusion Conditionsmentioning

confidence: 99%

Bionanocomposite films developed from corn starch and natural and modified nano-clays with or without added blueberry extract

2018

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“…To evaluate the effects of each filler (NMnt, NMnt + JFE, MntMB, MntMB + JFE, MntMD, and MntMD + JFE) on the properties of the resulting films, 16 g (4% w/w) of each was added to the starch content of each film system, maintaining the same glycerol:starch ratio. This percentage was employed based on previous studies carried out by our research group (Vazquez et al 2012;Ludueña et al 2015): percentages greater than 4% w/w can deteriorate the mechanical properties of the developed materials. Each system was pre-blended manually until homogeneous mixtures were obtained.…”

Section: Film Formation and Extrusion Conditionsmentioning

confidence: 99%

Bionanocomposite Films Prepared from Corn Starch With and Without Nanopackaged Jamaica (Hibiscus sabdariffa) Flower Extract

Toro-Márquez

Merino

Gutiérrez

2018

Food Bioprocess Technol

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Active and pH-sensitive nano-fillers were prepared from natural and modified montmorillonite (Mnt) and nanopackaged with anthocyanins extracted from the Jamaica (Hibiscus sabdariffa) flower. These were then used to reinforce corn (Zea mays) starchbased films plasticized with glycerol, and processed by extrusion and thermo-molding. Seven film systems were investigated for their potential as Bactive and intelligent^(A&I) bionanocomposite films with improved properties. The thermal and mechanical properties of the bionanocomposite films obtained were enhanced largely due to the added modified clay nano-fillers, and the nanopackaging of the anthocyanins between the nano-clay layers. Unfortunately, however, the bionanocomposite films failed as A&I materials, despite the supposed effect of the nano-clays as protective nano-encapsulating materials for the active and pHsensitive compound (anthocyanins). The results obtained suggest that the exfoliation of the nano-fillers as a consequence of the shear forces inside the extruder led to the exposure of the anthocyanins during extrusion. Because of this, we consider the largescale development of A&I biodegradable films incorporating natural pigments very unlikely being processed by extrusion/ thermo-molding, since there are several significant processes involved in the techniques currently available in the food and polymer industries that leave the active and pH-sensitive compounds unprotected.

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Enhancing the integration of bentonite clay with polycaprolactone by intercalation with a cationic surfactant: effects on clay orientation and composite tensile properties

et al. 2021

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Biodegradable Polymer/Clay Nanocomposites

Cited by 4 publications

References 162 publications

Bionanocomposite films developed from corn starch and natural and modified nano-clays with or without added blueberry extract

Bionanocomposite films developed from corn starch and natural and modified nano-clays with or without added blueberry extract

Bionanocomposite Films Prepared from Corn Starch With and Without Nanopackaged Jamaica (Hibiscus sabdariffa) Flower Extract

Enhancing the integration of bentonite clay with polycaprolactone by intercalation with a cationic surfactant: effects on clay orientation and composite tensile properties

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