Mechanical and water barrier properties of corn-protein-based biodegradable plastics

2000 ◽  
Vol 15 (12) ◽  
pp. 2612-2619 ◽  
Author(s):  
Lodovico di Gioia ◽  
Bernard Cuq ◽  
Stéphane Guilbert
Keyword(s):  
Relative Humidity ◽  
Octanoic Acid ◽  
Transmission Rate ◽  
Barrier Properties ◽  
Material Structure ◽  
Water Barrier ◽  
Corn Protein ◽  
Water Glycerol ◽  
Water Transmission ◽  
Thermoplastic Resins

Experiments were performed to evaluate the mechanical and water barrier properties of corn-protein-based materials that were compression molded from thermoplastic resins. The influence of varying concentrations of water, glycerol, and octanoic acid was studied. At 0% relative humidity, the material exhibited a linear elastic deformation and a brittle fracture at any glycerol or octanoic acid content. Raising relative humidity from 0% to 97.3%, progressively decreased the tensile strength (from 24.1 to 2.2 MPa and 19.4 to 1.0 MPa), and the modulus of elasticity (from 1.67 to 0.03 GPa and 1.87 to 0.13 GPa), respectively, for the octanoic acid- or glycerol-plasticized materials. Increasing water content did not increase the tensile strain at break of the glycerol-plasticized material, whereas this parameter changed from 1.6 to 52.3% for octanoic-acid-plasticized material. This last material was waterproof during 21 h and its water transmission rate was then 0.05 mmolmm-2 s -1. Differences in water absorption were related to plasticizer solubility and material structure.

Food Grade Bioplastic Based on Corn Starch with Banana Pseudostem Fibre/Bacterial Cellulose Hybrid Filler

2014 ◽  
Vol 997 ◽  
pp. 158-168 ◽  
Author(s):  
Heri Hermansyah ◽  
Rena Carissa ◽  
Merisa Bestari Faiz ◽  
Priscilla Deni
Keyword(s):  
Mechanical Properties ◽  
Mechanical Strength ◽  
Bacterial Cellulose ◽  
Corn Starch ◽  
Transmission Rate ◽  
Barrier Properties ◽  
Hybrid Filler ◽  
Food Grade ◽  
Soil Burial ◽  
Water Barrier

Food grade bioplastic has become a popular research topic these days. However, further studies are still required in order to develop bioplastic that has comparable mechanical and water barrier properties with synthetic plastic. In this research, to improve mechanical and water barrier properties of plant cellulose filled bioplastic, bacterial cellulose is added to create hybrid filler with banana pseudostem fibre in glycerol plasticized corn starch matrix. The filler banana pseudostem fibre and bacterial cellulose were first dispersed in mixture of glycerol and distilled water, starch was added and mixture was heated until gelatinization occured. The mixture was then casted and dried in oven. Research proved that 10wt% against starch mass was an optimum filler composition, which resulted in the highest mechanical strength of bioplastic. The utilization of hybrid filler showed a decrease in mechanical strength compared with bioplastic with single filler. The ratio of banana pseudostem:bacterial cellulose compotition in hybrid filler that gave the best mechanical properties was 25:75 which resulted in tensile strength 4.599 MPa and modulus 174.1 MPa. Although the utilization of hybrid filler did not improve the mechanical properties of bioplastic, the addition of bacterial cellulose was proven to give positive effect to water barrier properties. Bioplastic filled with hybrid 10wt% banana pseudostem fibre and 35wt% bacterial cellulose had water vapour transmission rate 3.8958 g/m2/hour. The mechanical and water barrier properties of bioplastic was confirmed with SEM, FTIR, and XRD analysis. Soil burial test for 9 days proved that banana pseudostem filler decreased 6.9% of corn starch bioplastic biodegradation rate.

scholarly journals Functional Nanocellulose, Alginate and Chitosan Nanocomposites Designed as Active Film Packaging Materials

Polymers ◽  
2021 ◽  
Vol 13 (15) ◽  
pp. 2523
Author(s):  
Gregor Lavrič ◽  
Ana Oberlintner ◽  
Inese Filipova ◽  
Uroš Novak ◽  
Blaž Likozar ◽  
...  
Keyword(s):  
Contact Angle ◽  
Food Packaging ◽  
Moisture Absorption ◽  
Mechanical Performance ◽  
Transmission Rate ◽  
Barrier Properties ◽  
Good Alternative ◽  
Bacterial Nanocellulose ◽  
Water Barrier ◽  
And Function

 The aim of the study was to characterize and compare films made of cellulose nanocrystals (CNC), nano-fibrils (CNF), and bacterial nanocellulose (BNC) in combination with chitosan and alginate in terms of applicability for potential food packaging applications. In total, 25 different formulations were made and evaluated, and seven biopolymer films with the best mechanical performance (tensile strength, strain)—alginate, alginate with 5% CNC, chitosan, chitosan with 3% CNC, BNC with and without glycerol, and CNF with glycerol—were selected and investigated regarding morphology (SEM), density, contact angle, surface energy, water absorption, and oxygen and water barrier properties. Studies revealed that polysaccharide-based films with added CNC are the most suitable for packaging purposes, and better dispersing of nanocellulose in chitosan than in alginate was observed. Results showed an increase in hydrophobicity (increase of contact angle and reduced moisture absorption) of chitosan and alginate films with the addition of CNC, and chitosan with 3% CNC had the highest contact angle, 108 ± 2, and 15% lower moisture absorption compared to pure chitosan. Overall, the ability of nanocellulose additives to preserve the structure and function of chitosan and alginate materials in a humid environment was convincingly demonstrated. Barrier properties were improved by combining the biopolymers, and water vapor transmission rate (WVTR) was reduced by 15–45% and oxygen permeability (OTR) up to 45% by adding nanocellulose compared to single biopolymer formulations. It was concluded that with a good oxygen barrier, a water barrier that is comparable to PLA, and good mechanical properties, biopolymer films would be a good alternative to conventional plastic packaging used for ready-to-eat foods with short storage time. 

scholarly journals The Development of a Uniform Alginate-Based Coating for Cantaloupe and Strawberries and the Characterization of Water Barrier Properties

Foods ◽  
2019 ◽  
Vol 8 (6) ◽  
pp. 203 ◽  
Author(s):  
Tugce Senturk Parreidt ◽  
Martina Lindner ◽  
Isabell Rothkopf ◽  
Markus Schmid ◽  
Kajetan Müller
Keyword(s):  
Water Vapor ◽  
Sodium Alginate ◽  
Water Loss ◽  
Transmission Rate ◽  
Film Formation ◽  
Tween 80 ◽  
Barrier Properties ◽  
Coating Application ◽  
Water Barrier

Water loss, gain or transfer results in a decline in the overall quality of food. The aim of this study was to form a uniform layer of sodium alginate-based edible coating (1.25% sodium alginate, 2% glycerol, 0.2% sunflower oil, 1% span 80, 0.2% tween 80, (w/w)) and investigate the effects on the water barrier characteristics of fresh-cut cantaloupe and strawberries. To this end, a uniform and continuous edible film formation was achieved (0.187 ± 0.076 mm and 0.235 ± 0.077 mm for cantaloupe and strawberries, respectively) with an additional immersion step into a calcium solution at the very beginning of the coating process. The coating application was effective in significantly reducing the water loss (%) of the cantaloupe pieces. However, no significant effect was observed in water vapor resistance results and weight change measurements in a climate chamber (80%→60% relative humidity (RH) at 10 °C). External packaging conditions (i.e., closed, perforated, and open) were not significantly effective on water activity (aw) values of cantaloupe, but were effective for strawberry values. In general, the coating application promoted the water loss of strawberry samples. Additionally, the water vapor transmission rate of stand-alone films was determined (2131 g·100 µm/(m2·d·bar) under constant environmental conditions (23 °C, 100%→50% RH) due to the ability to also evaluate the efficacy in ideal conditions.

scholarly journals Impact of Backbone Amide Substitution at the Meta- and Para-Positions on the Gas Barrier Properties of Polyimide

Materials ◽  
2021 ◽  
Vol 14 (9) ◽  
pp. 2097
Author(s):  
Qian Wen ◽  
Ao Tang ◽  
Chengliang Chen ◽  
Yiwu Liu ◽  
Chunguang Xiao ◽  
...  
Keyword(s):  
Transmission Rate ◽  
Barrier Properties ◽  
Polyimide Film ◽  
Flexible Display ◽  
Gas Barrier ◽  
Positron Annihilation Lifetime ◽  
Barrier Materials ◽  
Oxygen Transmission Rate ◽  
Display Technology ◽  
Gas Barrier Properties

This study designed and synthesised a meta-amide-substituted dianiline monomer (m-DABA) as a stereoisomer of DABA, a previously investigated para-amide-substituted dianiline monomer. This new monomer was polymerised with pyromellitic dianhydride (PMDA) to prepare a polyimide film (m-DABPI) in a process similar to that employed in a previous study. The relationship between the substitution positions on the monomer and the gas barrier properties of the polyimide film was investigated via molecular simulation, wide-angle X-ray diffraction (WXRD), and positron annihilation lifetime spectroscopy (PALS) to gain deeper insights into the gas barrier mechanism. The results showed that compared with the para-substituted DABPI, the m-DABPI exhibited better gas barrier properties, with a water vapour transmission rate (WVTR) and an oxygen transmission rate (OTR) as low as 2.8 g·m−2·d−1 and 3.3 cm3·m−2·d−1, respectively. This was because the meta-linked polyimide molecular chains were more tightly packed, leading to a smaller free volume and lower molecular chain mobility. These properties are not conducive to the permeation of small molecules into the film; thus, the gas barrier properties were improved. The findings have significant implications for the structural design of high-barrier materials and could promote the development of flexible display technology.

Novel Whey Protein Isolate/Polyvinyl Biocomposite for Packaging: Improvement of Mechanical and Water Barrier Properties by Incorporation of Nano-silica

2021 ◽  
Author(s):  
Bruna Rage Baldone Lara ◽  
Paulo Sérgio de Andrade ◽  
Mario Guimarães Junior ◽  
Marali Vilela Dias ◽  
Lizzy Ayra Pereira Alcântara
Keyword(s):  
Whey Protein ◽  
Barrier Properties ◽  
Whey Protein Isolate ◽  
Protein Isolate ◽  
Nano Silica ◽  
Water Barrier

Multifunctional hydrolyzed EVA membranes with tunable microstructure and water barrier properties

2015 ◽  
Vol 480 ◽  
pp. 93-103 ◽  
Author(s):  
Jorge A. Soto Puente ◽  
Kateryna Fatyeyeva ◽  
Stéphane Marais ◽  
Eric Dargent
Keyword(s):  
Barrier Properties ◽  
Water Barrier

Effect of Thickness on the Water-Barrier Properties of Silane Films

2007 ◽  
Vol 111 (42) ◽  
pp. 15325-15330 ◽  
Author(s):  
Guirong Pan ◽  
Erik Watkins ◽  
Jaroslaw Majewski ◽  
Dale W. Schaefer
Keyword(s):  
Barrier Properties ◽  
Water Barrier
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