Green enzymatic synthesis and processing of poly (cis-9,10-epoxy-18-hydroxyoctadecanoic acid) in supercritical carbon dioxide (scCO2)

Sagnelli, Domenico; Vestri, Ambra; Curia, Silvio; Taresco, Vincenzo; Santagata, Gabriella; Johansson, Mats; Howdle, Steven M.

doi:10.1016/j.eurpolymj.2021.110827

Cited by 6 publications

(8 citation statements)

References 66 publications

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“…Mechanical properties of the polymer films (5 mm (length) × 5 mm (width) × 0.06 ± 0.005 mm (thickness)) were measured from −20 • C up to breaking, at a heating rate of 3 • C min −1 with an applied frequency of 1 Hz. Samples were preloaded with 0.5 N stress to ensure sample stiffness during analysis [52,53].…”

Section: Polarized Optical Microscopymentioning

confidence: 99%

Photo-Responsivity Improvement of Photo-Mobile Polymers Actuators Based on a Novel LCs/Azobenzene Copolymer and ZnO Nanoparticles Network

et al. 2021

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The efficiency of photomobile polymers (PMP) in the conversion of light into mechanical work plays a fundamental role in achieving cutting-edge innovation in the development of novel applications ranging from energy harvesting to sensor approaches. Because of their photochromic properties, azobenzene monomers have been shown to be an efficient material for the preparation of PMPs with appropriate photoresponsivity. Upon integration of the azobenzene molecules as moieties into a polymer, they act as an engine, allowing fast movements of up to 50 Hz. In this work we show a promising approach for integrating ZnO nanoparticles into a liquid crystalline polymer network. The addition of such nanoparticles allows the trapping of incoming light, which acts as diffusive points in the polymer matrix. We characterized the achieved nanocomposite material in terms of thermomechanical and optical properties and finally demonstrated that the doped PMP was better performing that the undoped PMP film.

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Section: Polarized Optical Microscopymentioning

confidence: 99%

Photo-Responsivity Improvement of Photo-Mobile Polymers Actuators Based on a Novel LCs/Azobenzene Copolymer and ZnO Nanoparticles Network

et al. 2021

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“…However, the i-PrOH adhesive had the lowest epoxy group content (0.11 mmol g −1 ). A high epoxy group content is a desirable property since epoxy groups play a role in the formation of cross-linked networks [ 21 ]. From that point of view, the epoxy group value for the EtOH adhesive was almost 6 times higher—0.61 mmol g −1 .…”

Section: Resultsmentioning

confidence: 99%

Utilization of Suberinic Acids Containing Residue as an Adhesive for Particle Boards

et al. 2022

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The birch (Betula spp.) outer bark is a valuable product rich in betulin. After removal of betulin extractives, suberin containing tissues are left. Suberin is a biopolyester built from α,ω-bifunctional fatty acids (suberinic acids), which after depolymerization together with lignocarbohydrate complex is a potential adhesive as a side-stream product (residue) from obtaining suberinic acids for polyol synthesis. In this work, we studied the utilization possibilities in particleboards of the said residue obtained by depolymerization in four different solvents (methanol, ethanol, isopropanol and 1-butanol). The adhesives were characterised by chemical (acid number, solubility in tetrahydrofuran, epoxy and ash content) and instrumental analytical methods (SEC-RID, DSC, TGA and FTIR). Based on the results of mechanical characteristics, ethanol was chosen as the most suitable depolymerization medium. The optimal hot-pressing parameters for particleboards were determined using the design of experiments approach: adhesive content 20 wt%; hot-pressing temperature 248 °C, and hot-pressing time 6.55 min.

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“…Polloni A.E.d et al [ 173 ] produced polyester with a molecular weight of 33,000 by enzyme-catalyzed ROP of ω-pentadecalactone in ScCO 2 after 2 h of reaction, and the water content of the reaction medium was found to be inversely proportional to the molecular weight. Domenico et al [ 174 ] used ScCO 2 as the solvent and Novozym 435 as the biocatalyst for the low-temperature polycondensation of cis-9,10-epoxy-18-hydroxyoctadecanoic acid (CHA) at 35–55 °C to obtain polyesters with an average molecular weight of 18,000. The ScCO 2 solvent can be an alternative way to ease the mass transfer between reactants under low-temperature conditions, and retain the valuable groups of monomers during the polymerization process.…”

Section: Solvent System For Enzyme-catalyzed Synthesis Of Polyestersmentioning

confidence: 99%

Recent Advances in the Enzymatic Synthesis of Polyester

Wang

Liu²,

Lee

et al. 2022

Polymers

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Polyester is a kind of polymer composed of ester bond-linked polybasic acids and polyol. This type of polymer has a wide range of applications in various industries, such as automotive, furniture, coatings, packaging, and biomedical. The traditional process of synthesizing polyester mainly uses metal catalyst polymerization under high-temperature. This condition may have problems with metal residue and undesired side reactions. As an alternative, enzyme-catalyzed polymerization is evolving rapidly due to the metal-free residue, satisfactory biocompatibility, and mild reaction conditions. This article presented the reaction modes of enzyme-catalyzed ring-opening polymerization and enzyme-catalyzed polycondensation and their combinations, respectively. In addition, the article also summarized how lipase-catalyzed the polymerization of polyester, which includes (i) the distinctive features of lipase, (ⅱ) the lipase-catalyzed polymerization and its mechanism, and (ⅲ) the lipase stability under organic solvent and high-temperature conditions. In addition, this article also focused on the advantages and disadvantages of enzyme-catalyzed polyester synthesis under different solvent systems, including organic solvent systems, solvent-free systems, and green solvent systems. The challenges of enzyme optimization and process equipment innovation for further industrialization of enzyme-catalyzed polyester synthesis were also discussed in this article.

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Green enzymatic synthesis and processing of poly (cis-9,10-epoxy-18-hydroxyoctadecanoic acid) in supercritical carbon dioxide (scCO2)

Cited by 6 publications

References 66 publications

Photo-Responsivity Improvement of Photo-Mobile Polymers Actuators Based on a Novel LCs/Azobenzene Copolymer and ZnO Nanoparticles Network

Photo-Responsivity Improvement of Photo-Mobile Polymers Actuators Based on a Novel LCs/Azobenzene Copolymer and ZnO Nanoparticles Network

Utilization of Suberinic Acids Containing Residue as an Adhesive for Particle Boards

Recent Advances in the Enzymatic Synthesis of Polyester

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