Synthesis, antibacterial activity, and enzymatic decomposition of bio-polyurethane foams containing propolis

Jeong, Jisu; Oh, Dongki; Goh, Munju

doi:10.1016/j.jiec.2022.01.036

Cited by 6 publications

(3 citation statements)

References 26 publications

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“…Jeong and co-workers 116 synthesized bio-polyurethane foams by reacting toluene diisocyanate with sucrose and propolis. A foaming rate as high as 1440% was observed for the polyurethane formulation containing 15 wt% of sucrose and 20 wt% of propolis.…”

Section: Recent Advances In Polyurethane Recyclingmentioning

confidence: 99%

Recycling of polyurethanes: where we are and where we are going

Rossignolo,

Malucelli,

Lorenzetti

2024

Green Chem.

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Section: Recent Advances In Polyurethane Recyclingmentioning

confidence: 99%

Recycling of polyurethanes: where we are and where we are going

Rossignolo,

Malucelli,

Lorenzetti

2024

Green Chem.

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“…Overall, even if enzymes capable of degrading the urethane and ester bonds in PURs have been discovered, processes that make exclusive use of enzymes have relatively high degradation rates only on synthetic or oligomeric PURs designed to be more biodegradable [ 166 , 167 ]. Therefore, the best options for PUR biodegradation are the use of environmental microbial strains or consortia, the design of more degradable novel PUR materials, or synergy with chemical methods of depolymerization [ 168 ].…”

Section: Biotechnological Systems Applied To Plastic Depolymerization...mentioning

confidence: 99%

Microbial Enzyme Biotechnology to Reach Plastic Waste Circularity: Current Status, Problems and Perspectives

Orlando

Molla

Castellani

et al. 2023

IJMS

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The accumulation of synthetic plastic waste in the environment has become a global concern. Microbial enzymes (purified or as whole-cell biocatalysts) represent emerging biotechnological tools for waste circularity; they can depolymerize materials into reusable building blocks, but their contribution must be considered within the context of present waste management practices. This review reports on the prospective of biotechnological tools for plastic bio-recycling within the framework of plastic waste management in Europe. Available biotechnology tools can support polyethylene terephthalate (PET) recycling. However, PET represents only ≈7% of unrecycled plastic waste. Polyurethanes, the principal unrecycled waste fraction, together with other thermosets and more recalcitrant thermoplastics (e.g., polyolefins) are the next plausible target for enzyme-based depolymerization, even if this process is currently effective only on ideal polyester-based polymers. To extend the contribution of biotechnology to plastic circularity, optimization of collection and sorting systems should be considered to feed chemoenzymatic technologies for the treatment of more recalcitrant and mixed polymers. In addition, new bio-based technologies with a lower environmental impact in comparison with the present approaches should be developed to depolymerize (available or new) plastic materials, that should be designed for the required durability and for being susceptible to the action of enzymes.

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“…Among foams, polyurethanes (PUs) are one of the largest families and have widespread applications in diverse areas because they can be formulated to meet specific requirements depending on their nature, whether flexible or rigid [ 10 , 11 ]. PU foams (PUFs) are produced by polyaddition of isocyanates to polyols in the presence of water, which generates CO 2 gas.…”

Section: Introductionmentioning

confidence: 99%

Recent Progress of Non-Isocyanate Polyurethane Foam and Their Challenges

et al. 2023

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Polyurethane foams (PUFs) are a significant group of polymeric foam materials. Thanks to their outstanding mechanical, chemical, and physical properties, they are implemented successfully in a wide range of applications. Conventionally, PUFs are obtained in polyaddition reactions between polyols, diisoycyanate, and water to get a CO2 foaming agent. The toxicity of isocyanate has attracted considerable attention from both scientists and industry professionals to explore cleaner synthesis routes for polyurethanes excluding the use of isocyanate. The polyaddition of cyclic carbonates (CCs) and polyfunctional amines in the presence of an external blowing agent or by self-blowing appears to be the most promising route to substitute the conventional PUFs process and to produce isocyanate-free polyurethane foams (NIPUFs). Especially for polyhydroxyurethane foams (PHUFs), the use of a blowing agent is essential to regenerate the gas responsible for the creation of the cells that are the basis of the foam. In this review, we report on the use of different blowing agents, such as Poly(methylhydrogensiloxane) (PHMS) and liquid fluorohydrocarbons for the preparation of NIPUFs. Furthermore, the preparation of NIPUFs using the self-blowing technique to produce gas without external blowing agents is assessed. Finally, various biologically derived NIPUFs are presented, including self-blown NIPUFs and NIPUFs with an external blowing agent.

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Synthesis, antibacterial activity, and enzymatic decomposition of bio-polyurethane foams containing propolis

Cited by 6 publications

References 26 publications

Recycling of polyurethanes: where we are and where we are going

Recycling of polyurethanes: where we are and where we are going

Microbial Enzyme Biotechnology to Reach Plastic Waste Circularity: Current Status, Problems and Perspectives

Recent Progress of Non-Isocyanate Polyurethane Foam and Their Challenges

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