Synthesis of polyvinyl alcohol/modified starch-based biodegradable nanocomposite films reinforced with starch nanocrystals for packaging applications

2020 ◽  
pp. 096739112092242
Author(s):  
Aanchal Mittal ◽  
Sangeeta Garg ◽  
Anshuman Premi ◽  
Ardhendu Sekhar Giri
Keyword(s):  
Polyvinyl Alcohol ◽  
Acid Hydrolysis ◽  
Nanocomposite Film ◽  
Corn Starch ◽  
Nanocomposite Films ◽  
Scanning Electron Micrographs ◽  
Soil Burial ◽  
Hydrolysis Method ◽  
S Matrix ◽  
Starch Nanocrystals

In the present work, corn starch was grafted with oleic acid in the presence of redox initiators. Starch nanocrystals (SNCs) were synthesized using acid hydrolysis method and nanocomposite films were prepared by incorporation of SNCs into polyvinyl alcohol/starch (PVA/S) and PVA/grafted starch (PVA/GS) matrix, separately. It was observed that SNCs exhibited a platelet-like shape and in the size range of 200 nm. The increased crystallinity of SNCs indicated the removal of the amorphous and waxy region after acid hydrolysis of starch. Scanning electron micrographs of nanocomposite films showed good dispersion of SNCs within the PVA/GS matrix compared to the PVA/S matrix. The tensile strength of the nanocomposite films increased significantly with the reinforcement of SNCs into PVA/S matrix. Water uptake (%) of PVA/GS nanocomposite film decreased by 38.25% compared to the PVA/S nanocomposite film. Reinforcement of SNCs with PVA/S matrix improved the biodegradability of the films and was higher than PVA/S film. PVA/S nanocomposite film showed 32.4% weight loss after 120 days of soil burial degradation test. Thus, the obtained nanocomposite films can provide a potential alternative to the synthetic and nondegradable packaging films used worldwide.

scholarly journals Corn Starch-Chitosan Nanocomposite Film Containing Nettle Essential Oil Nanoemulsions and Starch Nanocrystals: Optimization and Characterization

Polymers ◽  
2021 ◽  
Vol 13 (13) ◽  
pp. 2113
Author(s):  
Fatemeh Kalateh-Seifari ◽  
Shima Yousefi ◽  
Hamed Ahari ◽  
Seyed Hedayat Hosseini
Keyword(s):  
Essential Oil ◽  
Nanocomposite Film ◽  
Food Packaging ◽  
Water Solubility ◽  
Corn Starch ◽  
Desirability Function ◽  
Nanocomposite Films ◽  
Function Technique ◽  
Vapor Permeability ◽  
Starch Nanocrystals

In the current study, nanocomposite films were produced based on corn starch:chitosan (CS:CH) biopolymers and the films were reinforced with nettle essential oil nanoemulsions (NEONEs) and starch nanocrystals (SNCs) to improve their physicochemical and mechanical properties. CS: CH at 70:30, 50:50, and 30:70 (w/w) ratios; SNCs at 2, 4, and 6% (w/w), and NEONEs at 0.5, 1, and 1.5% (w/w) were selected as variables. Then the various physical and mechanical attributes of chitosan-starch blended film containing SNCs and NEONEs were optimized using response surface methodology. The desirability function technique for the second-order polynomial models revealed that the following results could be achieved as the optimized treatment: water solubility of 51.56%; water absorption capacity of 128.75%; surface color of L (89.60), a (0.96), and b (1.90); water vapor permeability of 0.335 g/s Pa m, oxygen permeability of 2.60 cm3 μm/m2 d kPa; thickness of 154.41 µm, elongation at break of 53.54%; and tensile strength of 0.20 MPa at CS:CH of 38:62, SNC of 6.0%, and NEONEs of 0.41%. The nanocomposite film obtained can be employed as a novel biofunctional film with boosted physical mechanical and physical characteristics for food packaging applications.

Physical and Mechanical Characterization of Polyvinyl Alcohol Nanocomposite Made from Cellulose Nanofibers

2020 ◽  
Vol 988 ◽  
pp. 65-72
Author(s):  
Ferriawan Yudhanto ◽  
Jamasri ◽  
Heru Santoso Budi Rochardjo
Keyword(s):  
Polyvinyl Alcohol ◽  
Acid Hydrolysis ◽  
Nanocomposite Film ◽  
Cellulose Nanofibers ◽  
X Ray Diffraction ◽  
Casting Technique ◽  
Hydrolysis Method ◽  
Transmission Electron ◽  
Solution Casting Technique ◽  
Mixing Method

A method using a combination of acid hydrolysis and ultrasonic homogenize were developed to obtain the CNF (cellulose nanofibers) from agave cantala fibers. Acid hydrolysis method able to produce the CNF with a diameter around of 45-50 nm, which can investigated by transmission electron microscopy (TEM). The homogenize mixing method between CNF 5 wt% colloidal and 3 wt% PVA (polyvinyl alcohol) with magnetic stirrer 350 RPM, at temperature of 50 °C, for 30 minutes followed by ultrasonic homogenizer has been causing CNF well distributed in the PVA matrix. PVA/CNF nanocomposites film was prepared by solution casting technique. Physical properties test by x-ray diffraction (XRD) and fourier transform infrared (FTIR) shows highly crystalline of CNF which indicates improvements the mechanical properties of PVA/CNF nanocomposite film. The tensile stress and elongation at break of PVA/CNF nanocomposite film were increased by 55 % and 137 %.

Enhanced functional properties of biodegradable Polyvinyl alcohol /carboxymethyl cellulose (PVA/CMC) composite films reinforced with L-alanine surface modified CuO nanorods

2021 ◽  
Author(s):  
Yamanappagouda Amaregouda ◽  
Kantharaju Kamanna ◽  
Tilak Gasti ◽  
Vijay Kumbar
Keyword(s):  
Polyvinyl Alcohol ◽  
Carboxymethyl Cellulose ◽  
Food Packaging ◽  
Composite Films ◽  
Nanocomposite Films ◽  
Soil Burial ◽  
High Antibacterial Activity ◽  
Active Food Packaging ◽  
Surface Modified ◽  
Cuo Nanorods

Abstract Herein, we described novel biogenic preparation of the CuO nanorods and its surface modification with L-alanine amino acid accelerated by microwave irradiation. The effect of surface functionalized CuO nanorods on the polyvinyl alcohol/carboxymethyl cellulose film physico-mechanical properties were investigated through various characterization techniques. The tensile strength was improved from 28.58 ± 0.73 MPa to 43.40 ± 0.93 MPa, UV shielding ability and barrier to the water vapors were highly enhanced when PVA/CMC matrices filled with 8 wt% of CuO-L-alanine. In addition, the prepared films exhibited acceptable overall migration limit and readily undergoes soil burial degradation. Nevertheless, CuO-L-alanine incorporated films showed potent antioxidant activity against DPPH radicals and had high antibacterial activity against Staphylococcus aureus and Escherichia coli, and antifungal activity against Candida albicans and Candida tropicalis. Furthermore, the nanocomposite films showed negligible cytotoxic effect on HEK293 and Caco-2 cell lines. In these contexts, the developed nanocomposite films can be implementing as an active food packaging material.

Pea protein isolate nanocomposite films for packaging applications: effect of starch nanocrystals on the structural, morphological, thermal, mechanical and barrier properties

2020 ◽  
pp. 495
Author(s):  
Viviane Machado Azevedo ◽  
Ana Carolina Salgado De Oliveira ◽  
Soraia Vilela Borges ◽  
Josiane Callegaro Raguzzoni ◽  
Marali Vilela Dias ◽  
...  
Keyword(s):  
Corn Starch ◽  
Water Vapor Permeability ◽  
Protein Isolate ◽  
Nanocomposite Films ◽  
Vapor Permeability ◽  
Coating Materials ◽  
Performance Properties ◽  
Pea Protein ◽  
Starch Nanocrystals ◽  
Pea Protein Isolate

Abstract: Studies have been made to explore the utilization of pea proteins in terms of edible film and coating materials. The reinforcement of biopolymer films with plant-based nanocrystals has been applied in order to improve their performance properties. The objective was to evaluate the effect of the incorporation of corn starch nanocrystals (SN) (0-15%) in pea protein isolate films. Thermal analysis showed that the addition of up to 5% starch nanocrystals increased thermal stability. A 22.3% decrease was observed in water vapor permeability with the addition of SN. Increasing the SN concentration altered the arrangement of the structure to interleaved, in the matrix, as seen in transmission micrographs. This study showed that the use of corn starch nanocrystals as reinforcement in pea protein films had an effect on the films. The incorporation of up to 10% SN is suggested in order to increase the performance properties of pea protein isolate films.

Nanocomposite Films from Mango Kernel or Corn Starch with Starch Nanocrystals

2018 ◽  
Vol 70 (11-12) ◽  
pp. 1800028 ◽  
Author(s):  
Ana Vitória Oliveira ◽  
Ana Priscila Monteiro da Silva ◽  
Matheus O. Barros ◽  
Men de sá M. Souza Filho ◽  
Morsyleide F. Rosa ◽  
...  
Keyword(s):  
Corn Starch ◽  
Nanocomposite Films ◽  
Mango Kernel ◽  
Starch Nanocrystals

scholarly journals Synthesis and Characterization of a New Nanocomposite Film Based on Polyvinyl Alcohol Polymer and Nitro Blue Tetrazolium Dye as a Low Radiation Dosimeter in Medical Diagnostics Application

Polymers ◽  
2021 ◽  
Vol 13 (11) ◽  
pp. 1815
Author(s):  
Saleh Alashrah ◽  
Yassine El-Ghoul ◽  
Mohammed Ahmed Ali Omer
Keyword(s):  
Polyvinyl Alcohol ◽  
Nanocomposite Film ◽  
Radiation Detection ◽  
Medical Diagnostics ◽  
Linear Increase ◽  
Nitro Blue Tetrazolium ◽  
Diagnostic Radiology ◽  
Nanocomposite Films ◽  
X Ray ◽  
Blue Tetrazolium

Dosimetry is a field of increasing importance in diagnostic radiology. There has been a realization among healthcare professionals that the dose of radiation received by patients via modern medical X-ray examinations could induce acute damage to the skin and eyes. The present study highlights the synthesis of polyvinyl alcohol/nitro blue tetrazolium nanocomposite films (PVA/NBT) for radiation detection depending on chromic, optical, chemical and morphologic changes. First, we synthesized the nanocomposite film-based PVA doped with NBT and the different parameters of the preparation procedure were optimized. Then The films were exposed to different low X-ray doses on the scale of mGy level (0, 2, 4, 10 and 20 mGy). The sensitivity and the performance of the made composite films were evaluated via different characterization methods. Indeed, the response curve based on UV-Vis absorptions revealed a linear increase in absorbance with increased radiation doses (R = 0.998). FTIR analysis showed a clear chemical modification in recorded spectra after irradiation. X-ray diffraction assessment revealed clear structural changes in crystallinity after ionization treatment. SEM analysis showed a clear morphological modification of PVA/NBT films after irradiation. In addition, the prepared PVA/NBT films exhibited excellent pre- and post-irradiation stability in dark and light. Finally, the quantitative colorimetry study confirmed the performance of the prepared films and the different colorimetric coordinates, the total color difference (∆E) and the color strength (K/S) showed a linear increase with increasing X-ray doses. The made nanocomposite PVA/NBT film might offer promising potential for an effective highly sensitive medical dosimeter applied for very low doses in X-ray diagnostic radiology.

scholarly journals Lignin–Cellulose Nanocrystals from Hemp Hurd as Light-Coloured Ultraviolet (UV) Functional Filler for Enhanced Performance of Polyvinyl Alcohol Nanocomposite Films

Nanomaterials ◽  
2021 ◽  
Vol 11 (12) ◽  
pp. 3425
Author(s):  
Yi Zhang ◽  
Abu Naser Md Ahsanul Haque ◽  
Maryam Naebe
Keyword(s):  
Polyvinyl Alcohol ◽  
Cellulose Nanocrystals ◽  
Nanocomposite Film ◽  
Nanocomposite Films ◽  
Uv Shielding ◽  
Light Region ◽  
Food Package ◽  
Potential Applications ◽  
Extraction Processes ◽  
Hemp Hurd

Lignin is a natural light-coloured ultraviolet (UV) absorber; however, conventional extraction processes usually darken its colour and could be detrimental to its UV-shielding ability. In this study, a sustainable way of fabricating lignin–cellulose nanocrystals (L-CNCs) from hemp hurd is proposed. A homogeneous morphology of the hemp particles was achieved by ball milling, and L-CNCs with high aspect ratio were obtained through mild acid hydrolysis on the ball-milled particles. The L-CNCs were used as filler in polyvinyl alcohol (PVA) film, which produced a light-coloured nanocomposite film with high UV-shielding ability and enhanced tensile properties: the absorption of UV at wavelength of 400 nm and transparency in the visible-light region at wavelength of 550 nm was 116 times and 70% higher than that of pure PVA, respectively. In addition to these advantages, the nanocomposite film showed a water vapour transmission property comparable with commercial food package film, indicating potential applications.

scholarly journals Polyaniline: tin oxide polymeric nanocomposite films. An electrical and dielectric study

2018 ◽  
Vol 36 (4) ◽  
pp. 711-716 ◽  
Author(s):  
Rajeev Arora ◽  
Subhash Chand ◽  
Pankaj Sharma
Keyword(s):  
Dielectric Constant ◽  
Polyvinyl Alcohol ◽  
Nanocomposite Film ◽  
Ac Conductivity ◽  
In Situ Polymerization ◽  
Polymer Nanocomposite ◽  
Dielectric Behavior ◽  
Nanocomposite Films ◽  
Dielectric Study ◽  
High Dielectric

AbstractA conducting nanocomposite film of 60 nm nano-SnO2-polyaniline (PANI) and polyvinyl alcohol (PVA) has been synthesized and analyzed in terms of AC conductivity and dielectric behavior. The conducting polymer nanocomposite of PANI/60 nm (SnO2) and polyvinyl alcohol (PVA) has been prepared via in situ polymerization technique. The morphology of the nanocomposite film has been studied by SEM. The film has been characterized in terms of DC conductivity. The dielectric behavior and AC conductivity of the nanocomposite film have been investigated in the frequency range of 2 Hz to 90 KHz. The film has high dielectric constant which may be correlated with polarization. It has been observed that both dielectric loss and dielectric constant decrease with an increase in frequency.

Synthesis and Characterisation of Polyaniline-Polyvinyl Alcohol-NiO Nanocomposite Film

2011 ◽  
Vol 3 (8) ◽  
pp. 91-93 ◽  
Author(s):  
Sindhu Honmute ◽  
◽  
Arunkumar Lagashetty ◽  
A. Venkataraman A. Venkataraman
Keyword(s):  
Polyvinyl Alcohol ◽  
Nanocomposite Film
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