Thermoplastic Starch Films Added with Dry Nopal (Opuntia Ficus Indica) Fibers

Scognamiglio, Fabrizio; Gattia, Daniele Mirabile; Roselli, Graziella; Persia, Franca; Angelis, U. De; Santulli, Carlo

doi:10.3390/fib7110099

Cited by 14 publications

(12 citation statements)

References 18 publications

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“…Tensile tests indicate a large scattering of results among the different samples, as reported in Figure 8. This appears to be an inherent characteristic of TPS, produced by film deposition without therefore using dedicated moulds, and has been described already in previous studies [24]. As reported in Table 2, the introduction of iron particles results in a reduction of the ultimate strain of the TPS, which is not surprising due to the higher rigidity obtained.…”

Section: -4-mechanical Propertiessupporting

confidence: 76%

Conductive Thermoplastic Starch (TPS) Composite Filled with Waste Iron Filings

et al. 2020

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A thermoplastic starch (TPS) was produced, starting with potato starch, glycerol and acetic acid, to shape it in films of thickness around 100 microns. To TPS iron waste filing particles, in the amount of 12% the weight of starch, were introduced in different modalities: as received, reduced in size by the use of a mortar, after treatment with hydrochloric acid, and after treatment and removal of hydrochloric acid. Morphological studies were carried out by optical and scanning electron microscopy and illustrated that the dispersion of iron filings was not optimal, though some improvement was observed by a reduced dimension of the particles. Tensile tests indicated the considerable improvement of stiffness offered by the insertion of iron particles to TPS, although the ultimate strain was reduced to less than 10%. Thermal characterization using thermogravimetry allowed revealing the three typical peaks for potato starch degradation, with only a slight decrease due to iron introduction. EDS allowed evaluating the presence of impurities in the iron filings and evidenced that the presence of iron was more effective on the surface than in the rest of the film. As a final consideration, An improvement in electrical conductivity by over an order of magnitude was obtained by the TPS+Fe+HCl film with respect to pure TPS.

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Section: -4-mechanical Propertiessupporting

confidence: 76%

Conductive Thermoplastic Starch (TPS) Composite Filled with Waste Iron Filings

et al. 2020

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“…Cladodes were received from garden waste collectors, as soon as they were cut from the plant for seasonal pruning and mucilage extraction was carried out using the only parenchyma, the use of the fibrous components present in the surface was already treated in work published in [15].…”

Section: Mucilage Extraction and Preliminary Measurementsmentioning

confidence: 99%

“…This work proceeds from an extensive study over Opuntia cladode waste, with the idea of globally resulting into a full use of the material obtained. In particular, the crystalline fraction of the cellulose content was disposed of by obtaining nanocellulose fibers [14], while a second study concerned the use of dry nopal fibers to reinforce a starch-glycerol thermoplastic polymer [15]. Here, the examination is completed by evaluating the mechanical and thermal characteristics of Opuntia mucilage extracted with different methods to be introduced again in a TPS matrix.…”

Section: Introductionmentioning

confidence: 99%

Thermoplastic Starch (TPS) Films Added with Mucilage from Opuntia Ficus Indica: Mechanical, Microstructural and Thermal Characterization

et al. 2020

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Opuntia cladodes are a typical vegetable waste, from which mucilage in gel form can be extracted. This work proposes blending it with a self-produced thermoplastic starch (TPS), originating from potato starch with a high content in glycerol (ca. 30%). Three methods were compared for extraction, bare maceration (MA), mechanical blending (ME) and mechanical blending following maceration (MPM) to produce films with an approximate thickness of 150 μm. For the comparison, tensile testing, differential scanning calorimetry and scanning electron microscopy were used. The MPM process proved the most effective, not only for extraction yielding, but also to obtain a larger deformation of the samples with respect to the one allowed by the pure TPS films. A considerable plasticization effect was observed. Despite this, the mechanical performance is still not completely satisfactory, and the expected effect of the calcium and magnesium salts contained in the mucilage to improve the rigidity of the TPS film was not really revealed. Prospected improvements would concern the fabrication process and the investigation of other possible loading modes and sample geometries.

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“…Nopal (Opuntia ficus indica) is a cactus of great agronomical importance in Mexico; there are 3 million hectares of native nopal and approximately 233,000 hectares of cultivated nopal; of these, 150,000 hectares are destined for human consumption, with a 139,193-ton annual production [16,17]. Different nopal species have been studied to determine the chemical compounds present in the plant to understand its properties and applications.…”

Section: Introductionmentioning

confidence: 99%

Electrochemical evaluation of mucilage and cochineal pigments as a hybrid film coating on aluminum surfaces

López¹,

Sánchez²,

Guerrero-Serrano³

et al. 2022

Mater. Res. Express

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This work deals with the electrochemical evaluation of a hybrid coating based on mucilage and prickly pear cochineal (Dactylopius coccus) for corrosion protective applications. The Opuntia streptacantha mucilage was extracted by grinding prickly pear cochineal, and three coatings containing mucilague (CM), cochineal-mucilage (CMC), and cochineal-mucilage without Tween 80 (CMC-T) were formulated. The aluminum working electrodes (WE) were coated by immersion and then left to dry for 72 hours at room temperature. The formed coats were assessed by electrochemical impedance spectroscopy, electrochemical noise, and potentiodynamic polarization curves after 24, 72, and 168 hours of immersion in a 3.5 wt% NaCl solution. These electrochemical measurements were performed in triplicate to check reproducibility. The Tween 80 plasticizer-free cochineal-mucilage-based hybrid coating reveals more excellent protection against corrosion than uncoated aluminum. Optical micrographs were used to set apart the conditions of the hybrid coating after its valuation, which show the protection of the metallic surface on which it was not coated. Results showed that the hybrid coating has suitable properties as a barrier against corrosion due to its ability to block the aggressive species diffusion by trapping them in the coating structure, which prevents their contact with the metal surface. This property is attributable to better mucilage and cochineal film homogeneity. Also, it acts as a corrosion inhibitor due to its semi-permeable behavior where only water molecules flow through its pores. This hybrid coating showed an excellent corrosion-resistant behavior to be used to protect aluminum.

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Thermoplastic Starch Films Added with Dry Nopal (Opuntia Ficus Indica) Fibers

Cited by 14 publications

References 18 publications

Conductive Thermoplastic Starch (TPS) Composite Filled with Waste Iron Filings

Conductive Thermoplastic Starch (TPS) Composite Filled with Waste Iron Filings

Thermoplastic Starch (TPS) Films Added with Mucilage from Opuntia Ficus Indica: Mechanical, Microstructural and Thermal Characterization

Electrochemical evaluation of mucilage and cochineal pigments as a hybrid film coating on aluminum surfaces

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