Sustainable biodegradable coatings for food packaging: challenges and opportunities

Jahangiri, Fatemeh; Mohanty, Amar K.; Misra, Manjusri

doi:10.1039/d3gc02647g

Cited by 7 publications

(1 citation statement)

References 259 publications

(476 reference statements)

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“…Biodegradable bioplastics are considered an ideal solution to the global issue of nonbiodegradable plastic pollution. , Poly(lactic acid) (PLA), derived from the fermentation of plant resources, possesses excellent biodegradability and high mechanical strength and has been widely used in food packaging, pharmaceuticals, and textiles. − However, under homogeneous conditions, PLA exhibits relatively low nucleation and crystallization rates, typically presenting an amorphous state. Consequently, the use of low-crystallinity PLA products is severely restricted by their low glass transition temperatures. − …”

Section: Introductionmentioning

confidence: 99%

Developing an Efficient Biobased Nucleating Agent with Antimicrobial Properties by Controlling the Conformation of Poly(lactic acid) Based on Intermolecular Forces

Xiao,

Wu,

Liu

et al. 2024

Macromolecules

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Exploring the molecular-level interaction mechanisms between the molecular structure and conformation to develop efficient nucleating agents is an intriguing endeavor. In this study, we synthesized a series of indole acid derivative organic metal salt biobased nucleating agents with different numbers of methylene linkages for the preparation of PLA and zinc salts of indolic acid composite materials (PLA-IA-Zn). The results demonstrated that 3-indolecarboxylic acid zinc salt (ICA-Zn) without methylene linkages exhibited excellent nucleating activity. With an addition level of 0.5 wt %, PLA-ICA-Zn exhibited increased crystallization peak temperature and crystallinity to 117.5 °C and 54.9%, respectively, while the half-crystallization time was reduced to 2.6 min at 135 °C. Time-resolved Fourier transform infrared spectroscopy and molecular dynamics results demonstrate that the absence of methylene connectivity significantly enhances the van der Waals energy between the nucleating agent and PLA in the molten state, promoting intermolecular and intramolecular interactions within PLA, increasing the content of the gt conformation (corresponding to the 10 3 helical conformation of the α-type PLA crystal) during the PLA crystallization process, and thereby reducing the nucleation barrier. The antibacterial results showed that the PLA-IA-Zn composite materials achieved inhibition rates of over 93.2% for Escherichia coli and over 87.3% for Staphylococcus aureus. This study provides a new strategy at the molecular level for designing efficient nucleating agent molecules with both antibacterial functionality and high performance.

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Section: Introductionmentioning

confidence: 99%

Developing an Efficient Biobased Nucleating Agent with Antimicrobial Properties by Controlling the Conformation of Poly(lactic acid) Based on Intermolecular Forces

Xiao,

Wu,

Liu

et al. 2024

Macromolecules

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Cellulose nanocrystal‐modified bio‐based aqueous polyurethane coating agent for kraft paper packaging

Chen,

Feng,

Han

et al. 2024

J of Applied Polymer Sci

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With the implementation of the “plastic restriction order” and the demand for sustainable society development, biodegradable coatings derived from biomass materials have garnered significant interest. This study presents the synthesis of a double‐salt bio‐based waterborne polyurethane (PLA‐WPU) by utilizing poly(lactic acid) polyol (PLA) and isophorone diisocyanate (IPDI) as the main raw materials, along with 2,2‐dihydroxymethylpropionic acid (DMPA) and sodium ethylenediamine ethanesulfonate (A‐95) as a hydrophilic chain extender. Synergistic reinforcement of PLA‐WPU using hydrophobically modified cellulose nanocrystals (M‐CNC) and polycarbonate diimide (PDCDA). At an M‐CNC content of 3% relative to the effective mass of PLA‐WPU, the tensile strength reached 36.12 MPa. After 8 days a lipase PBS solution, the degradation rate reached 54%. Excellent waterproof performance was observed, exhibiting a contact angle of 143.5°. When applied as a surface coating on kraft paper, the Cobb 60 value decreased from 74.0 to 28.6 g/m2, while increasing the tensile strength by 451.3%. Importantly, the kraft paper maintained excellent waterproofing, mechanical strength, and high barrier properties even after repeated folding, high and low‐temperature conditions, and exposure to varying pH solutions. It proved to be both degradable and recyclable, making it a promising alternative to liner paper or plastic membrane, especially in food packaging.

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Innovative biomaterials for food packaging: Unlocking the potential of polyhydroxyalkanoate (PHA) biopolymers

Yeo,

Muiruri,

Fei

et al. 2024

Biomaterials Advances

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Sustainable biodegradable coatings for food packaging: challenges and opportunities

Abstract: Bio-based and petroleum-based biodegradable coatings: materials, methods, and modifications to improve the performance of polymeric substrates for plastic and paper-based food packaging applications.

Cited by 7 publications

References 259 publications

Developing an Efficient Biobased Nucleating Agent with Antimicrobial Properties by Controlling the Conformation of Poly(lactic acid) Based on Intermolecular Forces

Developing an Efficient Biobased Nucleating Agent with Antimicrobial Properties by Controlling the Conformation of Poly(lactic acid) Based on Intermolecular Forces

Cellulose nanocrystal‐modified bio‐based aqueous polyurethane coating agent for kraft paper packaging

Innovative biomaterials for food packaging: Unlocking the potential of polyhydroxyalkanoate (PHA) biopolymers

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