Acid-catalyzed in-situ cross-linking of polyol on sodium alginate to improve its strength and hydrophobic properties

Xu, Yi; Guo, Jing; Liu, Yuanfa; Yang, Qiang; Zhang, Xin; Guan, Fang

doi:10.1016/j.matdes.2022.110424

Cited by 14 publications

(7 citation statements)

References 33 publications

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“…This was in agreement with previous work of Kouser et al [23] On the other hand, the peak of sodium alginate was reported at 2θ of 12°. It was typically attributed to [001], similar to the work of Xu et al [24] Comparison to diffraction pattern peaks of polyvinyl alcohol, low intensity peak of sodium alginate was thus observed.…”

Section: Resultssupporting

confidence: 58%

Release Characteristic and Antioxidant Activity of 4‐Hydroxybenzoic Acid (4HB) from Sodium Alginate and Polyvinyl Alcohol‐based Hydrogel

et al. 2022

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1, 3 and 5 %wt of 4‐hydroxybenzoic acid (4HB) was successfully loaded into sodium alginate and polyvinyl alcohol‐based hydrogel composite for enhancement of antioxidant activities. Hydrogel was prepared by freeze thaw technique. No crosslinking agents were employed. Fourier transform infrared and X‐ray diffraction technique revealed that no significant change of functional group and crystallinity was observed when 4HB was loaded. By using freeze thaw technique, microstructural properties were well packed as reported by scanning electron microscope. Due to small amount of 4‐hydroxybenzoic acid, thermal characteristic was presented in the similar feature compare to pristine hydrogel. Differential scanning calorimetry exhibited that the glass transition and melting temperatures were reported to be 90 °C and 225 °C, respectively. However, tensile strength was slightly reduced by loading 4HB. The swelling behavior was very rapidly increased at the initial stage and then it was stable. Antioxidant activities were observed by means of DPPH assay. It was important to note that 4HB loaded into sodium alginate and polyvinyl alcohol‐based hydrogel exhibited outstanding properties to be candidate as food additives to help prevent food deterioration.

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Section: Resultssupporting

confidence: 58%

Release Characteristic and Antioxidant Activity of 4‐Hydroxybenzoic Acid (4HB) from Sodium Alginate and Polyvinyl Alcohol‐based Hydrogel

et al. 2022

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“…First, in the spectrum of ε-PLL, the amide III peak of ε-PLL is at 1258 cm –1 , which is also observed in the FTIR spectrum of MCs, indicating an adsorption of ε-PLL on HNTs . Moreover, in the spectrum of SA, the asymmetric COO – stretching vibration peak of SA is at 1609 cm –1 , which is also observed in the FTIR spectrum of MCs, suggesting a successful adsorption of SA. − In addition, the zeta potential of HNTs changes from −25.2 to 30.9 mV after adsorption of ε-PLL and further changes to −30.2 mV after the next adsorption of SA (Figure d). These changes of zeta potential originated from protonated α-amino groups in positively charged ε-PLL molecules and −COO – groups in negatively charged SA. ,, In addition, the absolute value of zeta potential is over 30 mV, suggesting that the encapsulation system is stable. − Combining the FTIR results with the zeta potential results, it can be proved that the encapsulation of ε-PLL and SA on HNTs is successful.…”

Section: Resultsmentioning

confidence: 77%

Designing Smart Microcapsules with Natural Polyelectrolytes to Improve Self-Healing Performance for Water-Based Polyurethane Coatings

Njuko

Meng

et al. 2022

ACS Appl. Mater. Interfaces

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Active anticorrosive organic coatings adopting microcapsules (MCs) have lately attracted extensive attention as they were proven to be effective to minimize metal corrosions and offer a long-lasting protection performance. Herein, a novel environmental-friendly active corrosion protection system was designed for aluminum alloy 2024 (AA2024) based on water-based polyurethane coatings with the addition of water and alkaline pHresponsive smart MCs, which is fabricated by utilizing 2mercaptobenzothiazole (2-MBT) as an inhibitor, halloysite clay nanotubes (HNTs) as an inhibitor carrier, and the natural polyelectrolytes ε-poly-L-lysine (ε-PLL) and sodium alginate (SA) as layer-by-layer (LBL) encapsulation polyelectrolytes. Salt spray tests and electrochemical measurements prove that the scratched coatings with embedded MCs possess an excellent self-healing performance by forming an adsorption layer of released 2-MBT on the AA2024 surface, thereby providing over 90% inhibition efficiency within 6 days' immersion. The UV−vis spectrophotometer results further showed that the release of 2-MBT is a three-stage long-term process sensitive to water and alkaline pH value, while the outward release rate is both regulated by the solubility of 2-MBT and the SA layer. The fabricated MCs not only offer a great promise to provide an excellent self-healing performance but also shed light on the future design of advanced MCs on demand based on the LBL technique.

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“…This was likely due to the reported low UV barrier property of alginate. 50 Importantly, the developed film had a good visual appearance and high transparency, which may prove useful for food packaging. The transmittance values in the UV-visible region (200-800 nm) are shown in Fig.…”

Section: Mechanical and Thermal Propertiesmentioning

confidence: 99%

Edible, strong, and low‐hygroscopic bacterial cellulose derived from biosynthesis and physical modification for food packaging

2023

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BackgroundThe pervasive presence of plastic packaging has led to significant environmental contamination due to excessive reliance on petrochemicals and the inherent non‐biodegradability of these materials. Bacterial cellulose (BC) films present a viable alternative for food packaging applications, owing to their environmentally friendly synthesis process, non‐toxic nature, robust mechanical strength, and biodegradability. However, the high hygroscopicity of such bio‐based materials has limited their widespread adoption, as it results in diminished strength and barrier properties. In this study, a novel approach for creating edible, transparent, robust, and high‐barrier BC‐based composite packaging was proposed through biosynthesis with the incorporation of soy protein isolate and the physical interpenetration of calcium alginate‐polyethylene glycol as a composite coating.ResultsThe finding demonstrated that the synthesized bio‐based composite material exhibits stability in water, high optical transparency, complete oil resistance, and full degradability within 1 to 2 months. Furthermore, the composite material displayed enhanced mechanical properties in both dry and wet conditions, with a tensile strength of approximately 84 MPa, outperforming commercially available kraft paper and low‐density polyethylene.ConclusionsSoy protein isolate established a rigid, coherent, and homogeneous network with BC fibrils, thereby augmenting mechanical properties. Calcium alginate can be effectively combined with BC, utilizing polyethylene glycol as a binder and plasticizer, to generate a densely packed structure with reduced hygroscopicity. This bio‐based composite material demonstrated considerable potential for application in food packaging and other value‐added sectors as a substitute for non‐degradable plastics. © 2023 Society of Chemical Industry.

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Acid-catalyzed in-situ cross-linking of polyol on sodium alginate to improve its strength and hydrophobic properties

Cited by 14 publications

References 33 publications

Release Characteristic and Antioxidant Activity of 4‐Hydroxybenzoic Acid (4HB) from Sodium Alginate and Polyvinyl Alcohol‐based Hydrogel

Release Characteristic and Antioxidant Activity of 4‐Hydroxybenzoic Acid (4HB) from Sodium Alginate and Polyvinyl Alcohol‐based Hydrogel

Designing Smart Microcapsules with Natural Polyelectrolytes to Improve Self-Healing Performance for Water-Based Polyurethane Coatings

Edible, strong, and low‐hygroscopic bacterial cellulose derived from biosynthesis and physical modification for food packaging

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