Investigation on the Effects of Glycerol and Clay Contents on the Structure and Mechanical Properties of Maize Starch Nanocomposite Films

Mansour, Gabriel; Zoumaki, Maria; Marinopoulou, Anna; Raphaelides, Stylianos N.; Tzetzis, Dimitrios; Zoumakis, Nikolaos

doi:10.1002/star.201900166

Cited by 17 publications

(15 citation statements)

References 27 publications

(56 reference statements)

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“…The stability and shelf life of the thermoplastic starch films can be affected by their moisture content. [ 41,42 ] One‐way ANOVA revealed significant differences ( p < 0.05) in the moisture content of the films ( Figure ). As shown in Figure 1a, the moisture of the films ranged from 9.5% to 18.8%.…”

Section: Resultsmentioning

confidence: 99%

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Biodegradable Films from Spray Dried Starch Inclusion Complexes with Bioactive Compounds—The Effect of Glycerol and pH

et al. 2022

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In the present study, thermoplastic films are prepared using spray dried starch-bioactive compound systems powders with different concentrations of glycerol (20% or 40%). The starch-based films are produced by casting after dissolution under neutral (pH 7) or alkaline conditions (pH 12). Results reveal that elevated glycerol contents lead to increased moisture and hygroscopicity which is related to the availability of more ─OH groups. ANOVA shows that the glycerol concentration, the pH value, and the interactions of bioactive compounds with glycerol, bioactive compounds with pH, and glycerol with pH, influence significantly the mechanical properties of the thermoplastic starch films. Young's modulus of elasticity increases alongside with glycerol content, indicating improved flexibility of the films. Stress decreases with higher glycerol contents and lower pH while strain on the contrary, increases as the glycerol and pH increase in the films. Significant differences are also observed in water adsorption and water vapor transmission rate values. As expected, water adsorption increases with increasing relative humidity (RH) with the glycerol content positively affecting the water uptake by the films. Microscopic examination indicates the homogeneous distribution of the bioactive compounds in the matrix of the films.

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Section: Resultsmentioning

confidence: 99%

“…Films from spray dried starch systems containing drugs and bioactive compounds (ibuprofen, acetylsalicylic acid, paracetamol, myristic acid) were prepared by the casting method [ 40–42 ] with some modifications.…”

Section: Methodsmentioning

confidence: 99%

Biodegradable Films from Spray Dried Starch Inclusion Complexes with Bioactive Compounds—The Effect of Glycerol and pH

et al. 2022

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“…Thermogravimetric analysis (TGA) is a technique used for characterizing the thermal stability of a material [3]. The TGA curve in Figure 4 shows the mass loss percentage of a sample of this (starch -based) material as a function of increasing temperature (with constant heating rate of 5 °C/min, using a TGA analyzer TAQ50, TA Instruments, USA).…”

Section: Resultsmentioning

confidence: 99%

“…The construction sector produces a considerable amount of waste and greenhouse gas emissions that drive global warming. The recent literature on construction research indicates that biodegradable materials made from renewable sources are sustainable concrete alternatives that use natural polymers (such as starch and cellulose) instead of traditional cement [2][3][4][5].…”

Section: Introductionmentioning

confidence: 99%

Starch Sandstones in Building Bio-materials

2020

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A review of the recent literature shows that the use of more sustainable, eco-friendly recycled waste materials made from natural biopolymers is an important step of the planning process to reduce the environmental impacts of traditional building materials such as cement and concrete products. This study introduces the application of maize starch in the production of a novel biodegradable construction material. The samples prepared in this investigation were formed by heating a mixture of different proportions of starch, water and sand. The structural properties, morphology and chemical composition of materials were investigated by scanning electron microscopy (SEM) coupled with thermal gravimetric analysis (TGA). The structural characteristics and morphology of the study material to a certain extent resemble natural sandstones, the most common type of sedimentary rocks. Based on the uniaxial compressive strength classification schemes, comparing with the brittle deformation behavior of natural rocks, it can be considered that this material behaves as a polymer - matrix composite with a ductile - thermoplastic mechanical behavior.

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“…The crystallinity has great influence on mechanical, water barrier properties of SP-based films. [16,44] With the increase of CNC content, the crystallinity of SPbased films increased, which was due to the crystallinity of CNC being higher than the SP film. The hydrogen bond between the molecules was beneficial to the orderly arrangement of the molecules, therefore, the hydrogen bond formed between CNC and SP chains contributes to the crystallization.…”

Section: Xrd Analysis Of Sp-based Filmsmentioning

confidence: 99%

Hydrogen Bonding Crosslinking of Starch‐Polyvinyl Alcohol Films Reinforced by Ultrasound‐Assisted and Cellulose Nanofibers Dispersed Cellulose Nanocrystals

Jia

Teng²,

Huang³

et al. 2022

Starch Stärke

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The study reports the effects of cellulose nanofibers (CNF) and an ultrasound-assisted method dispersed cellulose nanocrystals (CNC) on the mechanical and water resistance properties of starch-polyvinyl alcohol (PVA) films. Starch-PVA (SP) based films are prepared by casting method, compared with the original SP films, the ultrasound-assisted and CNF are beneficial to the dispersion of CNC in nanocomposites, and the tensile strength (TS) of the ultrasound treatment starch/PVA/CNC/CNF (USPCF) film is increased to 10.63 MPa, an increase by 60%. The cross-section morphology of the USPCF film is smoother and more homogeneous, indicating the particle size of CNC is small. The structure of blend films is homogeneous and compact due to the CNC full playing to the nano-effect, which is the main reason for the improvement of SP-based films in mechanical properties. Fourier Transform Infrared spectroscopy shows the hydrogen bonding is formed between SP and the fillers, while X-ray diffraction shows that the crystallinity of nanocomposite films is decreased with ultrasonication. From the results, it can be concluded that CNF and ultrasound-assisted dispersed nanoparticles could reinforce the SP-based films efficiently to prepare green nanocomposite films.

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Investigation on the Effects of Glycerol and Clay Contents on the Structure and Mechanical Properties of Maize Starch Nanocomposite Films

Cited by 17 publications

References 27 publications

Biodegradable Films from Spray Dried Starch Inclusion Complexes with Bioactive Compounds—The Effect of Glycerol and pH

Biodegradable Films from Spray Dried Starch Inclusion Complexes with Bioactive Compounds—The Effect of Glycerol and pH

Starch Sandstones in Building Bio-materials

Hydrogen Bonding Crosslinking of Starch‐Polyvinyl Alcohol Films Reinforced by Ultrasound‐Assisted and Cellulose Nanofibers Dispersed Cellulose Nanocrystals

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