Thermal Stability of Cellulose Nanomaterials

D’Acierno, Francesco; Michal, Carl A.; MacLachlan, Mark J.

doi:10.1021/acs.chemrev.2c00816

Cited by 40 publications

(12 citation statements)

References 276 publications

(412 reference statements)

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“…The thermal stability of chitin is crucial for its potential practical applications. Improved thermal stability means better resistance to irreversible changes in the chemical and physical structure when exposed to higher temperatures . As such, we assessed the thermal stability of fungal chitin using thermogravimetry.…”

Section: Resultsmentioning

confidence: 99%

Environmental Sustainability and Physicochemical Property Screening of Chitin and Chitin-Glucan from 22 Fungal Species

Grifoll,

Bravo,

Pérez

et al. 2024

ACS Sustainable Chem. Eng.

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Thanks to its biobased character with embedded biogenic carbon, chitin can aid in the transition to a sustainable circular economy by replacing fossil carbon from the geosphere. However, meeting current demands for material availability and environmental sustainability requires alternative methods limiting conventional chemical and energy-consuming chitin extraction from crustaceans. To assist future chitinous bioproduct development, this work analyzes the physicochemical properties and potential environmental sustainability of fungal chitin-glucan complexes. A conventional isolation procedure using sodium hydroxide, a weak acid, and short reaction times are applied to the fruiting body of 22 fungal species. Besides, the valorization of underutilized waste streams including Agaricus bisporus and Agaricus brunnescens stipes is investigated. The carbohydrate analysis renders chitin fractions in the range of 9.5–63.5 wt %, while yields vary from 4.2 to 29.9%, and the N-acetylation degree in found in between 53.0 and 98.7%. The sustainability of the process is analyzed using life cycle assessment (LCA), providing impact quantification for global warming potential, terrestrial acidification, freshwater eutrophication, and water use. With 87.5–589.3 kg·CO2-equiv per kilo, potentially lower global warming potential values in comparison to crustacean chitin are achieved. The crystallinity degree ranged from 28 to 78%, while the apparent chitin crystalline size (L 020) is between 2.3 and 5.4 nm. Ten of the species yield α-chitin coexisting with semicrystalline glucans. Zwitterionic properties are observed in aqueous solutions, shifting from cationic to anionic at pH 4.5. With its renewable carbon content, fungal chitin is an environmentally sustainable alternative for high-value applications due to its balance of minimal treatment, low carbon footprint, material renewability, ease of isolation, thermal stability, zwitterionic behavior, biodegradability, and noncytotoxicity.

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Section: Resultsmentioning

confidence: 99%

Environmental Sustainability and Physicochemical Property Screening of Chitin and Chitin-Glucan from 22 Fungal Species

Grifoll,

Bravo,

Pérez

et al. 2024

ACS Sustainable Chem. Eng.

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“…The thermal behaviors of PBAT, PBAT/3H35, and PBAT/B3H35 were analyzed by TGA and DTG (Figure S3). The initial temperature ( T onset ) of thermal decomposition was determined by the tangent method described in the international standard ISO 11358-1 (2022), and the temperature of the maximum weight loss velocity point ( T max ) of the material was determined by the DTG curve. As shown in Figure S3, pure PBAT had only one degradation peak, which occurred at 315 to 469 °C.…”

Section: Resultsmentioning

confidence: 99%

Cyclodextrin-Based Isocyanate Functional Chain Extender and Its Application in Poly(butylene adipate-co-terephthalate)-Based Agricultural Materials

Han,

Fan,

Jiang

et al. 2024

ACS Appl. Polym. Mater.

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Replacing traditional plastics with biodegradable materials, such as poly(butylene adipate-co-terephthalate) (PBAT), is a reliable way to avoid farmland environmental pollution. However, the physical and mechanical properties of PBAT still have much to improve. Adding chain extenders to modify PBAT is one of the primary means. So far, the main chain extenders used are epoxy, anhydride, oxazoline, and isocyanate. In this paper, a blocked isocyanate chain extender with biological cyclodextrin as the skeleton material was designed and prepared(B3H35). When it was added to PBAT for melt blending at high temperature, the active isocyanate groups released by its deblocking reaction wound reacted with the terminal hydroxyl groups or carboxylic acid groups of PBAT to extend the molecular chain of PBAT, and then, a three-dimensional network was constructed based on dynamic hydrogen bonding, molecular entanglement, and physical cross-linking. As a result, the strength and toughness of PBAT improved simultaneously. Compared with pure PBAT, the tensile strength, elongation at break, and toughness of PBAT/B3H35 (2 wt %) increased by 17.7, 8.1, and 31.6%, respectively. In addition, 3,5-dimethylpyrazole, used as a blocking agent in this paper, is also released by deblocking during melt blending and endows PBAT/B3H35 with an excellent nitrification inhibition effect in agricultural soil. The experimental results show that the nitrification inhibition rate of the PBAT/B3H35 (3 wt %) reaches 80.64% after 35 days of landfill, significantly improving the utilization rate of the nitrogen fertilizer, thus reducing greenhouse gas emissions and environmental pollution. Overall, this work provides an idea and direction for designing and preparing functional chain extenders with simultaneous enhancement and toughening effects and nitrification inhibition functions for agricultural materials.

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“…Water, as a solvent and a hydrolysis reactant, influences the kinetic process of the reaction and the thoroughness of the hydrolysis, and thus has a significant influence on the modification effect. [14] The pH value has less influence on the settling height. When used as a catalyst, H + or OH À accelerates the hydrolysis reaction.…”

Section: Process Optimization Of Kh560 Modified Ceramic Hollow Powdermentioning

confidence: 99%

Development of a High‐Frequency Polytetrafluoroethylene (PTFE)‐Based Laminate With An Ultra‐Low Dielectric Constant by Combination of Ceramic Hollow Spheres and PTFE Resin

Wu,

Li,

Hong

et al. 2024

ChemistrySelect

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Ceramic hollow spheres and polytetrafluoroethylene (PTFE) resin are essential for the fabrication of ultra‐low dielectric constant laminates for high‐frequency printed circuit boards. The poor bonding between ceramic hollow spheres and PTFE is the fundamental obstacle to the homogeneity of the composite. In this work, the broken ceramic hollow spheres were first removed by flotation, and then the surface of the floated hollow spheres was modified using different silane coupling agents at various concentrations. By comprehensively considering the results of the orthogonal experiment, the optimal coupling agent is determined to be 3‐(methacryloyloxy) propyltrimethoxysilane (KH560). The effect of KH560 content, ethanol/water volume ratio, and pH value on the dielectric constant, dielectric layer density, water absorption, and Z‐axis thermal expansion coefficient of the parallel samples was investigated in detail. The optimum surface modification parameters are found to be 6 wt % KH560, an ethanol/water volume ratio of 9 : 1 and a pH of 4. Under optimum technological conditions, the fabricated composites exhibit superior properties with dielectric constant less than 2, indicating a potential application in high performance high frequency copper clad laminates.

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Thermal Stability of Cellulose Nanomaterials

Cited by 40 publications

References 276 publications

Environmental Sustainability and Physicochemical Property Screening of Chitin and Chitin-Glucan from 22 Fungal Species

Environmental Sustainability and Physicochemical Property Screening of Chitin and Chitin-Glucan from 22 Fungal Species

Cyclodextrin-Based Isocyanate Functional Chain Extender and Its Application in Poly(butylene adipate-co-terephthalate)-Based Agricultural Materials

Development of a High‐Frequency Polytetrafluoroethylene (PTFE)‐Based Laminate With An Ultra‐Low Dielectric Constant by Combination of Ceramic Hollow Spheres and PTFE Resin

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