Effect of super critical carbon dioxide and alkali treatment on oxygen barrier properties of thermoplastic starch/poly(vinyl alcohol) films
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Wei-xing Chen
Abstract
Sustainable oxygen barrier thermoplastic starch (TPS)/polyvinyl alcohol (PVA) blown films were successfully prepared by blending proper PVA loads during NaOH-treating and supercritical carbon dioxide (scCO2) assisted processing. The NaOH-treated TPS or scCO2TPS films showed smaller free-volume-cavity characteristics (FVCC) and oxygen transmission rate (OTR) than those of TPS (or scCO2TPS) prepared without proper alkali-treatment. Smaller OTR and FVCC values were detected for NaOH-treated scCO2TPS films than those of NaOH-treated TPS films prepared without scCO2-assistance. All OTR and FVCC values detected for proper alkali-treated scCO2TPS y PVA z films diminished distinctly to a smallest value, when their PVA loads came near a solubility limit value of 27.5 wt%. An essential result is that the OTR of the optimal NaOH-treated scCO2TPS y PVA z film is merely 3.1 cm3/m2 day atm, which meets the requirement of high oxygen barrier plastics. Dynamic molecular relaxations and WAXD patterns detected for proper NaOH-treated scCO2TPS y PVA z films disclosed that PVA was compatible with TPS, as PVA loads were ≤ the solubility limit value. The distinctly reduced OTR and FVCC detected for optimal NaOH-treated scCO2TPS y PVA z films are partially attributed to the reinforced molecular interactions between hydroxyl groups of TPS and PVA, as they were blended with proper PVA loads during their alkali-treating and scCO2-aid processing.
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Research ethics: The local Institutional Review Board deemed the study exempt from review.
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Author contributions: The authors have accepted responsibility for the entire content of this manuscript and approved its submission.
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Competing interests: The authors state no conflict of interest.
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Research funding: None declared.
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Data availability: The raw data can be obtained on request from the corresponding author.
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© 2023 Walter de Gruyter GmbH, Berlin/Boston
Articles in the same Issue
- Frontmatter
- Material Properties
- Effect of super critical carbon dioxide and alkali treatment on oxygen barrier properties of thermoplastic starch/poly(vinyl alcohol) films
- Promoting antibacterial activity of polyurethane blend films by regulating surface-enrichment of SiO2 bactericidal agent
- Improving anti-aging performance of terminal blend rubberized bitumen by using graft activated crumb rubber
- An experimental investigation of flame retardancy and thermal stability of treated and untreated kenaf fiber reinforced epoxy composites
- Preparation and properties of ABS/BNNS composites with high thermal conductivity for FDM
- Development of a high-strength carrageenan fiber with a small amount of aluminum ions pre-crosslinked in spinning solution
- Development and characterization of new formulation of biodegradable emulsified film based on polysaccharides blend and microcrystalline wax
- Study on the volatilization behavior of monomer and oligomers in polyamide-6 melt by dynamic film–forming device
- Engineering and Processing
- Numerical simulation on the mixing behavior of double-wave screw under speed sinusoidal pulsating enhancement induced by differential drive
- Numerical and experimental studies on the influence of gas pressure on particle size during gas-assisted extrusion of tubes with embedded antibacterial particles
Articles in the same Issue
- Frontmatter
- Material Properties
- Effect of super critical carbon dioxide and alkali treatment on oxygen barrier properties of thermoplastic starch/poly(vinyl alcohol) films
- Promoting antibacterial activity of polyurethane blend films by regulating surface-enrichment of SiO2 bactericidal agent
- Improving anti-aging performance of terminal blend rubberized bitumen by using graft activated crumb rubber
- An experimental investigation of flame retardancy and thermal stability of treated and untreated kenaf fiber reinforced epoxy composites
- Preparation and properties of ABS/BNNS composites with high thermal conductivity for FDM
- Development of a high-strength carrageenan fiber with a small amount of aluminum ions pre-crosslinked in spinning solution
- Development and characterization of new formulation of biodegradable emulsified film based on polysaccharides blend and microcrystalline wax
- Study on the volatilization behavior of monomer and oligomers in polyamide-6 melt by dynamic film–forming device
- Engineering and Processing
- Numerical simulation on the mixing behavior of double-wave screw under speed sinusoidal pulsating enhancement induced by differential drive
- Numerical and experimental studies on the influence of gas pressure on particle size during gas-assisted extrusion of tubes with embedded antibacterial particles
