Microstructure and physical properties of nano-biocomposite films based on cassava starch and laponite

Valencia, Germán Ayala; Luciano, Carla Giovana; Lourenço, Rodrigo Vinícius; Sobral, Paulo José do Amaral

doi:10.1016/j.ijbiomac.2017.10.031

Cited by 38 publications

(44 citation statements)

References 34 publications

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“…The results ranged from 35 to 106°; this showed that the corn and wheat film formulations presented hydrophilic characteristics, whereas the cassava films presented hydrophobic features with values higher than 90°. Similar contact angle results were reported by Białopiotrowicz and Valencia et al ., who analyzed corn (43 ± 3°) and cassava (76 ± 5°) starch films with glycerol and starch amounts of 4 and 5%, respectively. Da Silva et al .…”

Section: Resultssupporting

confidence: 88%

“…Water contact angle values above 65° are typical of a less hydrophilic surface. In contrast, values below 65° are characteristic of a hydrophilic surface …”

Section: Resultsmentioning

confidence: 97%

“…Although some values found for the water contact angle agreed with the WVP results, they could not be directly correlated. In addition to hydrophilicity, WVP is influenced by several other factors, including steric obstruction, water molecule diffusion, tortuosity, and the presence of pores, empty spaces, and preferential flow channels through the matrix …”

Section: Resultsmentioning

confidence: 99%

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Impact of the starch source on the physicochemical properties and biodegradability of different starch‐based films

Luchese

Benelli

Spada

et al. 2018

J of Applied Polymer Sci

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Concern about environmental issues has motivated research into the development of biodegradable packaging from renewable sources. Natural polymers such as starch constitute a good alternative for diminishing the use of nonbiodegradable and nonrenewable components in the packaging industry. However, depending on the botanical source, films with different properties are formed. The aim of this study was to evaluate the film‐forming capacity of different starch sources (cassava, corn, potato, and wheat) by casting with starch contents from 2 to 6%. Principal component analysis methodology was used to evaluate the correlation between the formulations and their physicochemical and mechanical properties. It was not possible to produce continuous films based on potato starch, probably because of its very low amylose content (10%). The corn‐, cassava‐, and wheat‐starch‐based films were characterized by their thicknesses (0.06–0.22 mm), moisture contents (19–26%), water solubilities (13.7–26.5%), water‐vapor permeabilities (WVPs; 0.19–0.48 g mm h−1 m−2 kPa−1), wettabilities (35–106°), biodegradabilities in soil, and thermal and mechanical properties (tensile strength = 1.9–6.7 MPa, elongation = 41–166%, and Young's modulus = 8–127 MPa). The wheat starch films presented higher WVPs and lower mechanical properties. The cassava starch films presented lower wettabilities and good mechanical properties; this suggested that their use in packaging for products, such as fruits and vegetables, with higher water activities could be feasible. © 2018 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2018, 135, 46564.

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Section: Resultssupporting

confidence: 88%

“…Water contact angle values above 65° are typical of a less hydrophilic surface. In contrast, values below 65° are characteristic of a hydrophilic surface …”

Section: Resultsmentioning

confidence: 97%

Section: Resultsmentioning

confidence: 99%

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Impact of the starch source on the physicochemical properties and biodegradability of different starch‐based films

Luchese

Benelli

Spada

et al. 2018

J of Applied Polymer Sci

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“…Analysis of the contact angle has shown that the biocomposites obtained have not exceeded the value of 0 • < θ < 90 • , which means they are hydrophobic materials [24]. The results obtained are similar to those obtained for starch films [25]. The highest contact angle of 62.7 • was obtained for the sample containing 8% of MCC, at 120 • C. A similar contact angle value of 61.75 • was obtained for biocomposites containing the least MCC and produced at the highest process temperature.…”

Section: Water Contact Anglesupporting

confidence: 78%

The Rape Pomace and Microcrystalline Cellulose Composites Made by Press Processing

et al. 2020

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This paper presents the results of research on biocomposites resulting from the combination of post-extraction rapeseed meal (RP) and microcrystalline cellulose (MCC). The products were fabricated using a press machine with a mould heating system. The biocomposites were then subjected to stress tests, their surface wettability was determined and color analyses were conducted. Fourier Transform Infrared Spectroscopy (FTIR), a cross-section observed by scanning electron microscope (SEM) and thermogravimetric analysis (TGA) were used to examine the structure and thermomechanical properties of the material obtained. The research results showed that an increase in the share of MCC to 8% and increasing the process temperature to 140 • C improved the strength parameters of the products obtained, as well as their thermal resistance. It was also found that the wettability of products was affected both by process temperature and addition of cellulose; similar wettability results were obtained for MCC 8% (120 • C) and MCC 2% (140 • C). Photographs taken using a scanning electron microscope revealed that the biocomposite surface was the smoothest in the case of materials fabricated under the highest process temperature and with the highest MCC proportion.

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“…O brilho dos filmes foi determinado na superfície de secagem usando um Glossímetro (Rhodopoint NGL 20/60), nos ângulos de 20° e 60° (Valencia et al, 2018).…”

Section: Brilhounclassified

Nanocristais de amido de quinoa: produção, caracterização e aplicação em filmes de amido

Vera¹,

Ethel²

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Recently researches on starch nanocrystals (SNC) production have become of interest due to their many applications, especially as reinforcement in polymeric matrices. Quinoa starch (QS) has desirable characteristics for SNC production such as small granule size and relatively low amylose content. Thus, the objective of this research was to produce quinoa SNC (QSNC) by acid hydrolysis at different temperatures (30, 35 and 40) °C. Furthermore, the effect of QSNC addition on the structural and physical properties of cassava starch films was studied. QS presented different percentages of hydrolysis on the fifth day, 63%, 73% and 91% for (30, 35 and 40) °C, respectively. QS (0.59 days-1) was hydrolyzed more rapidly than waxy maize starch (0.39 days-1) at 40 °C. QSNC yields decreased with temperature increase from (30 to 40) °C, while the relative crystallinity was not altered (~35%). The morphology of QSNC produced at 30 °C was irregular with micrometric size while those produced at 35 °C and 40 °C presented parallelepiped shapes with sizes between 50 nm and 100 nm and 400 nm to 900 nm (aggregates). The hydrodynamic diameter and the thermal properties of QSNC decreased with temperature increase, while the FTIR band intensities and the zeta potential increased. The properties indicated that quinoa QSNC were only obtained at (35 and 40) °C with yields of 22.8% and 6.8%, respectively. QSNC produced at 40 °C presented lower yield and crystallinity than waxy maize SNC, but a lower hydrodynamic diameter. Thus, based on the yield and transition temperature, QSNC produced at 35 °C was selected for application in cassava starch films. The films were prepared by casting technique, with 4 g of cassava starch / 100 g of film forming dispersion; 25 g glycerol / 100 g starch; and 0; 2.5; 5.0 and 7.5 g of QSNC / 100 g of starch. X-ray diffractograms confirmed the presence of QSNC in the films. Addition of QSNC to films increased the roughness and the contact angle at 5.0% and 7.5% concentrations, the tensile strength and elastic modulus, the color parameters L* and a* at 7.5% concentration, and the opacity; while decreasing deformation at break, water vapor permeability at 5.0% concentration, and gloss. Other film properties such as thickness, moisture content, solubility, thermal properties were not affected by QSNC addition. The results indicated that the QSNC produced at 35 ° C can be used as reinforcement in nanocomposite films to improve their mechanical properties.

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Microstructure and physical properties of nano-biocomposite films based on cassava starch and laponite

Cited by 38 publications

References 34 publications

Impact of the starch source on the physicochemical properties and biodegradability of different starch‐based films

Impact of the starch source on the physicochemical properties and biodegradability of different starch‐based films

The Rape Pomace and Microcrystalline Cellulose Composites Made by Press Processing

Nanocristais de amido de quinoa: produção, caracterização e aplicação em filmes de amido

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