Products of low-temperature pyrolysis of nanocellulose esters and implications for the mechanism of thermal stabilization

Agustin, Melissa B.; Nakatsubo, Fumiaki; Yano, Hiroyuki

doi:10.1007/s10570-016-1004-0

Cited by 16 publications

(10 citation statements)

References 30 publications

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“…As reported by Agustin et al (2016b) from the pyrolysis products, it can be deduced that removal of esters groups on the surface of CNFs can take place in two ways: the direct cleavage of the ester bonds from the cellulose chain to release the equivalent carboxylic acids; and the possible condensation reaction between adjacent two esters on the surface of CNFs to produce symmetrical ketones. It seems that straight chain esters were removed mainly by condensation reaction of the chain esters.…”

Section: Thermal Durability Of the Esterified Cnfsmentioning

confidence: 77%

Designing cellulose nanofiber surface for high density polyethylene reinforcement

et al. 2018

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Because of their high mechanical performance, high specific surface area, and high aspect ratio, there is a strong interest in cellulose nanofibers (CNFs) as a reinforcing material for plastics. Although three hydroxyl groups per repeating unit exposed on the surface is a unique characteristic of CNFs, an effective chemical treatment to improve the reinforcing efficiency of CNFs for hydrophobic thermoplastic resin has not yet been reported. In this study, six systematically designed aliphatic ester groups with linear, cyclic and branched structures, were incorporated on the surface of CNFs using the hydroxyl groups with a degree of substitution of 0.4. The melt compounding of the esterified CNFs and HDPE was performed at 140°C using a twin screw extruder followed by injection molding at 160°C and investigated the CNF dispersibility in HDPE and the CNF reinforcing efficiency in injection-molded HDPE samples. Incorporation of linear long chains results in the best dispersion of CNFs in HDPE compared with cyclic and branched chains, but the latter chains give higher reinforcing efficiencies in Young's modulus and tensile strength. Especially, the bulky t-butyl group gave the highest reinforcing efficiency. Thus, the structure of ester groups incorporated on the CNFs very much affects on the dispersibility in HDPE, Young's modulus and tensile strength, and coefficient of thermal expansion (CTE) of the esterified CNFsreinforced HDPE composites. Addition of pivaloylated CNFs increases the Young's modulus of HDPE from 1.20 to 3.32 GPa, and the tensile strength from 23.4 to 51.2 MPa. The CTE is 72.5 ppm/K, which is less than one-third that of the HDPE. The high reinforcing efficiency of these composites is partly explained by the formation of the double shish-kebab crystal structure during injection molding identified by the TEM observation.

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Section: Thermal Durability Of the Esterified Cnfsmentioning

confidence: 77%

Designing cellulose nanofiber surface for high density polyethylene reinforcement

et al. 2018

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“…It is worth 301 mentioning that the results have been normalized after removing the amount of moisture in the 302 samples. Esterified nanocellulose has been reported to have better thermal stability than reference 303 (Agustin et al 2016). It is worth noticing that at temperatures higher than 310 °C, reference has slower 304 degradation than modified samples which can be as a result from steeper degradation of LA phase.…”

Section: Effect Of Moisture and Water Content 261mentioning

confidence: 99%

Water resistant nanopapers prepared by lactic acid modified cellulose nanofibers

et al. 2017

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9The current work reports a novel, completely water based approach to prepare the water resistant 10 modified cellulose nanopapers. Lactic acid in aqueous medium was attached on cellulose nanofibers 11 surface with the aid of ultra-sonication and later oligomerized (polymerized) by compression molding 12 under high temperature and pressure, to obtain the modified nanopapers with enhanced mechanical 13properties. The modified nanopapers showed an increase of 32% in the elastic modulus and 30% in the 14 yield strength over reference nanopapers. Additionally, the modified nanopaper was hydrophobic in 15 nature and had superior storage modulus under moist conditions. The storage modulus of wet modified 16 nanopaper was three times (2.4 GPa) compared to the reference nanopapers (0.8 GPa) after 1 hour 17 immersion in water. Finally, the thermal stability of the modified nanopaper was also higher than 18 reference nanopaper. The material reported is 100% bio-based. 19

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“…En otras contribuciones se obtuvieron ésteres con diferente estructura del resto hidrocarbonado (acetilo, miristoílo (C14), benzoílo y pivaloílo) de BNC y CNF extraída de pulpa de madera. Se alcanzaron GS de 0,4 y 1,1 en un sistema de reacción de cloruro de acilo/piridina, utilizando como agente dispersante N-metil 2pirrolidona en un rango de temperatura de 50-60ºC (Agustín, Nakatsubo, & Yano, 2016;Agustín, Nakatsubo, & Yano, 2017). Otros autores informaron la esterificación superficial heterogénea de CNF obtenida a partir de madera utilizando líquidos iónicos como catalizadores y, como acilantes, diferentes anhídridos de variada longitud de cadena como anhídrido acético, isobutírico y hexanoico.…”

Section: Preparación De Materiales Compuestos Biodegradablesunclassified

“…Este resultado muestra la versatilidad de la metodología propuesta que permite obtener resultados similares utilizando diferentes combinaciones de parámetros de acuerdo con la conveniencia del caso. (Agustín et al, 2016;Agustín et al, 2017;Ávila Ramírez et al, 2014;. Además, en los espectros de las muestras acetiladas se observó la presencia de un hombro en la señal asignada al C-1 de la celulosa a ≈101,2 ppm (C1'), cuya intensidad se incrementó con el aumento del GS.…”

Section: Evaluación De Las Condiciones De Reacciónunclassified

Nanocomposites Based on Poly(lactic acid) and Bacterial Cellulose Acetylated by an α-Hydroxyacid Catalyzed Route

et al. 2019

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Products of low-temperature pyrolysis of nanocellulose esters and implications for the mechanism of thermal stabilization

Cited by 16 publications

References 30 publications

Designing cellulose nanofiber surface for high density polyethylene reinforcement

Designing cellulose nanofiber surface for high density polyethylene reinforcement

Water resistant nanopapers prepared by lactic acid modified cellulose nanofibers

Nanocomposites Based on Poly(lactic acid) and Bacterial Cellulose Acetylated by an α-Hydroxyacid Catalyzed Route

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