Effect of a plasticizer on the structure of biodegradable starch/clay nanocomposites: Thermal, water‐sorption, and oxygen‐barrier properties

Zeppa, C.; Gouanvé, Fabrice; Espuche, Éliane

doi:10.1002/app.29588

Cited by 136 publications

(109 citation statements)

References 54 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…22,23 This phenomenon was less intense in the samples containing 30% PLA (M3025 and M3030) which is consistent with these samples having a less hydrophilic character.…”

Section: Resultssupporting

confidence: 78%

“…This behavior has been reported by other authors working with hydrophilic polymers plasticized with polyols and is associated with increased amounts of hydroxyl groups from the plasticizer. 20,22,23 This increase causes an increase in the hygroscopicity of the material, reflected in the increase in the solubility coefficient of the samples with higher glycerol concentration.…”

Section: Resultsmentioning

confidence: 99%

See 1 more Smart Citation

Characterization of thermoplastic starch/poly(lactic acid) blends obtained by extrusion and thermopressing

Müller¹,

Pires²,

Yamashita³

2012

J. Braz. Chem. Soc.

View full text Add to dashboard Cite

Blendas de poli(ácido láctico)(PLA) e amido termoplástico (TPS) foram preparadas por extrusão e moldagem por compressão utilizando 0,1, 0,2 e 0,3 g de PLA per g de TPS. O TPS foi obtido por extrusão utilizando 0,25 e 0,30 g de glicerol por g de amido. Foram avaliadas as propriedades mecânicas e de barreira ao vapor de água, e determinadas as isotermas de sorção de umidade. A morfologia dos materiais foi avaliada através de microscopia eletrônica de varredura e as propriedades térmicas dos polímeros puros e das blendas, através de calorimetria diferencial de varredura (DSC). A microscopia e os resultados de DSC indicaram a imiscibilidade da blenda e a presença de duas fases. Nas blendas contendo 20% e 30% de PLA observou-se um aumento da tensão de ruptura e do módulo elástico. A blenda contendo 30% de PLA apresentou uma redução da permeabilidade ao vapor de água, comportamento associado à redução do coeficiente de difusão observada nesta amostra.Blends of poly(lactic acid) (PLA)/thermoplastic starch (TPS) were prepared by extrusion and thermopressing, with proportions of 0.1, 0.2 and 0.3 g of PLA per g TPS. Thermoplastic starch was obtained from the extrusion of 0.30 g or 0.25 g of glycerol per g of starch. The mechanical properties and water vapor permeability were tested and water sorption isotherms were obtained. The morphological characteristics of the samples were observed through scanning electron microscopy (SEM) and the thermal properties of the pure polymers and the blends by differential scanning calorimetry (DSC). The SEM and DSC results indicated the immiscibility of the TPS/ PLA blends and the presence of two phases. For blends with 20% and 30% of PLA increases in the tensile strength and modulus were observed. The lowest water vapor permeability was observed for the blend with 30% of PLA, which is related to the lowest diffusion coefficient value observed for this sample.

show abstract

“…22,23 This phenomenon was less intense in the samples containing 30% PLA (M3025 and M3030) which is consistent with these samples having a less hydrophilic character.…”

Section: Resultssupporting

confidence: 78%

Section: Resultsmentioning

confidence: 99%

Characterization of thermoplastic starch/poly(lactic acid) blends obtained by extrusion and thermopressing

Müller¹,

Pires²,

Yamashita³

2012

J. Braz. Chem. Soc.

View full text Add to dashboard Cite

show abstract

“…As kaolin content increased, OP decreased significantly. The incorporation of nanoparticles into the matrix could likely introduce a tortuous pathway for oxygen molecules to pass through, and the reduction in permeability coefficients means that gases should travel this longer diffusive path (Zeppa et al 2009;Nafchi et al 2013). Also reported similar OP results with the incorporation of nanoparticles (Bae et al 2009;Türe et al 2013).…”

Section: Permeability To Oxygenmentioning

confidence: 99%

Preparation and characterization of bionanocomposite films reinforced with nano kaolin

et al. 2015

View full text Add to dashboard Cite

Effects of nano-kaolin incorporation into semolina films on the physical, mechanical, thermal, barrier and antimicrobial properties of the resulting bio-nanocomposite films were investigated. The properties included crystal structure (by X-ray diffraction), mechanical resistance, color, Fourier transform infrared spectra, decomposition temperature, water-vapor permeability (WVP), oxygen permeability (OP), and antimicrobial activity against Staphylococcus aureus and Escherichia coli. Kaolin was incorporated into biofilms at various amounts (1, 2, 3, 4, and 5 %, w/w total solid). All films were plasticized with 50 % (w/w total solid) combination of sorbitol/glycerol at 3:1 ratio. The incorporation of nanokaolin into semolina films decreased OP and WVP. The moisture content and water solubility of the films were found to decrease by nanokaolin reinforcement, and mechanical properties of films were improved by increasing nanokaolin concentration. Tensile strength and Young's modulus increased from 3.41 to 5.44 MPa and from 63.12 to 136.18, respectively, and elongation-at-break decreased. The films did not exhibit UV absorption. In conclusion, nanokaolin incorporation enhanced the barrier and mechanical properties of semolina films, indicating the potential application of these bio-nanocomposites in food-product packaging.

show abstract

“…Several other studies showed no improvement on the thermal properties of starch/clay composites in comparison to TPS. 20,44,45 The first derivative of TGA curves of TPS and Star/Vee-Chit 5.0% nanocomposite are shown in Supporting Information, Figure S2. …”

mentioning

confidence: 99%

Nanocomposites Based on Cassava Starch and Chitosan-Modified Clay: Physico‑Mechanical Properties and Biodegradability in Simulated Compost Soil

Perotti

Kijchavengkul

Auras

et al. 2016

J. Braz. Chem. Soc.

View full text Add to dashboard Cite

Organic-inorganic nanocomposites based on cassava starch, glycerol and chitosan-modified Veegum ® HS clay mineral at two different low polymer-to-clay ratios (2.5 and 5.0 wt.%) were prepared by extrusion producing flexible, transparent and homogeneous plastics as potential candidates for agricultural purposes. X-ray diffraction and transmission electron microscopy images revealed the presence of both intercalated and exfoliated nanocomposites in all samples, in which exfoliation is the predominant type of microscopic structure. Statistically significant improvements of over 20% on the tensile strength and Young's modulus were observed for samples containing chitosan-modified clay in comparison to pristine thermoplastic starch. Chitosan deeply affects the conversion of polymer carbon to CO 2 through biodegradation. Mineralization values for the sample loaded with 5.0 wt.% of chitosan-modified clay in simulated compost soil showed a reduction of almost 40% in comparison to thermoplastic starch, benefiting applications where delay degradation is required.Keywords: organic-inorganic hybrids, nanocomposites, extrusion, cassava starch, Veegum clay IntroductionPolymers produced from biodegradable resources have been intensely investigated over the past decades in an effort to decrease human reliance on fossil-based materials, especially over growing concerns about improper discard of these materials. [1][2][3] In particular, naturally occurring polymers or commonly known as biopolymers, macromolecules with large abundance across the globe, seem potential candidates to replace partially or totally oil-based plastics in many applications. 1,3 Among them, biopolymers made from or blends with starch appear in a growing number of reported studies as a potential material with a broad array of applications. In fact, starch possesses several properties desired in modern materials, such as large availability from different sources obtained in all regions, low cost associated to both cultivation/harvesting and also processing to obtain the final product and full biodegradability under regular disposal conditions. 4,5 Cassava starch is composed mainly of two types of polysaccharides, amylose and amylopectin. 1,6 Even though amylose to amylopectin ratio might not be constant depending on the cassava species, it is usually around 1:4, respectively.7 While both polysaccharides are constituted by the same monomer unit called α-D-glucopyranose, amylose possesses almost exclusively 1-4 α linkages, originating short linear chains ( Figure 1a). 1,8 On the other hand, amylopectin features not only the presence of 1-4 α linkages, but also 1-6 α linkages, yielding much larger and coiled structures (Figure 1b). 9 In order to transform cassava starch on a plastic material, it is necessary to disrupt its hierarchical coiled structure. 10 Addition of plasticizers such as glycerol or urea, among others, is often needed during the production Nanocomposites Based on Cassava Starch and Chitosan-Modified Clay J. Braz. Chem. Soc. 650 of ther...

show abstract

Effect of a plasticizer on the structure of biodegradable starch/clay nanocomposites: Thermal, water‐sorption, and oxygen‐barrier properties

Cited by 136 publications

References 54 publications

Characterization of thermoplastic starch/poly(lactic acid) blends obtained by extrusion and thermopressing

Characterization of thermoplastic starch/poly(lactic acid) blends obtained by extrusion and thermopressing

Preparation and characterization of bionanocomposite films reinforced with nano kaolin

Nanocomposites Based on Cassava Starch and Chitosan-Modified Clay: Physico‑Mechanical Properties and Biodegradability in Simulated Compost Soil

Contact Info

Product

Resources

About