Property enhancement of optically transparent bionanofiber composites by acetylation

Nogi, Masaya; Abe, Kentaro; Handa, Keishin; Nakatsubo, Fumiaki; Ifuku, Shinsuke; Yano, Hiroyuki

doi:10.1063/1.2403901

Cited by 129 publications

(98 citation statements)

References 16 publications

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“…16b. They also reported that the addition of only 7.4 wt% of BC nanofibres, which deteriorated light transmittance by only 2.4%, was able to reduce the CTE of an acrylic resin from 86 to 38 ppm K -1 [192]. Subsequently, they succeeded in the production of composites possessing an ultra low CTE of 4 ppm K -1 at a fibre volume fraction of 5% [193].…”

Section: Applications and New Advances In Cellulose Nanocompositesmentioning

confidence: 85%

“…The flexibility and high thermal stability were attained by reinforcing a low Young's modulus transparent resin with low CTE and high modulus cellulose nanofibres forming an in-plane network layered structure of BC. In addition, they showed that acetylation significantly reduces the hygroscopicity of BC nanocomposites, while maintaining optical transparency and thermal stability [194,195]. It was also demonstrated that acetylation prevents the thermal deterioration of the composites [194].…”

Section: Applications and New Advances In Cellulose Nanocompositesmentioning

confidence: 97%

“…In addition, they showed that acetylation significantly reduces the hygroscopicity of BC nanocomposites, while maintaining optical transparency and thermal stability [194,195]. It was also demonstrated that acetylation prevents the thermal deterioration of the composites [194]. The successful reinforcement of transparent plastics with BC engendered a new interest in plant cellulose microfibrils.…”

Section: Applications and New Advances In Cellulose Nanocompositesmentioning

confidence: 99%

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Review: current international research into cellulose nanofibres and nanocomposites

et al. 2010

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This paper provides an overview of recent progress made in the area of cellulose nanofibre-based nanocomposites. An introduction into the methods used to isolate cellulose nanofibres (nanowhiskers, nanofibrils) is given, with details of their structure. Following this, the article is split into sections dealing with processing and characterisation of cellulose nanocomposites and new developments in the area, with particular emphasis on applications. The types of cellulose nanofibres covered are those extracted from plants by acid hydrolysis (nanowhiskers), mechanical treatment and those that occur naturally (tunicate nanowhiskers) or under culturing conditions (bacterial cellulose nanofibrils). Research highlighted in the article are the use of cellulose nanowhiskers for shape memory nanocomposites, analysis of the interfacial properties of cellulose nanowhisker and nanofibrilbased composites using Raman spectroscopy, switchable interfaces that mimic sea cucumbers, polymerisation from the surface of cellulose nanowhiskers by atom transfer radical polymerisation and ring opening polymerisation,

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Section: Applications and New Advances In Cellulose Nanocompositesmentioning

confidence: 85%

Section: Applications and New Advances In Cellulose Nanocompositesmentioning

confidence: 97%

Section: Applications and New Advances In Cellulose Nanocompositesmentioning

confidence: 99%

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Review: current international research into cellulose nanofibres and nanocomposites

et al. 2010

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“…Modification using hydrophobic functional groups on NFs will improve dispersibility in nonpolar solvents, hygroscopicity, and adhesion properties with hydrophobic matrices in composite materials [37]. In a series of modifications, acetylation is a simple, popular, and inexpensive approach to modifying the surface properties [38][39][40]. Chitin NFs were acetylated in a mixture of acetic anhydride and perchloric acid at room temperature (Scheme 1).…”

Section: Nanofibers From Squid Pen E-chitinmentioning

confidence: 99%

Chitin and Chitosan Nanofibers: Preparation and Chemical Modifications

2014

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Chitin nanofibers are prepared from the exoskeletons of crabs and prawns, squid pens and mushrooms by a simple mechanical treatment after a series of purification steps. The nanofibers have fine nanofiber networks with a uniform width of approximately 10 nm. The method used for chitin-nanofiber isolation is also successfully applied to the cell walls of mushrooms. Commercial chitin and chitosan powders are also easily converted into nanofibers by mechanical treatment, since these powders consist of nanofiber aggregates. Grinders and high-pressure waterjet systems are effective for disintegrating chitin into nanofibers. Acidic conditions are the key factor to facilitate mechanical fibrillation. Surface modification is an effective way to change the surface property and to endow nanofiber surface with other properties. Several modifications to the chitin NF surface are achieved,

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“…However, only few works reported an increase of thermal stability of nanocellulose by e.g. surface acetylation (Nogi et al 2006) or silanization (Qua et al 2011).…”

Section: Introductionmentioning

confidence: 99%

Biocomposites of polyamide 4.10 and surface modified microfibrillated cellulose (MFC): influence of processing parameters on structure and thermomechanical properties

2015

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Novel bio-polyamides obtained from renewable resources, e.g. PA4.10, are considered nowadays as promising 'green' engineering materials consisting of building blocks derived from castor oil. In this work the composites of heterogeneously acetylated microfibrillated cellulose (MFC) and biopolyamide 4.10 have been prepared by melt blending. Thermoplastic processing of PA4.10/MFC composites was possible in a narrow temperature window due to significant improvement of thermal stability of acetylated MFC as compared to raw MFC. The increase of thermooxidative stability of filler was due to removal of non-cellulosic components from the raw material and introduction of acetic moieties that had additional slight stabilizing effect on MFC. Moreover, the modified MFC showed significant changes in morphology that favoured its dispersibility in viscous polymer melt. Combined treatment of MFC by chemical agents, which caused partial hydrolysis of amorphous regions, and physical disintegration by ultrasonic waves resulted in formation of fibrous material with low degree of entanglement and submicron or nanometric diameters. In the tested range of screw speeds it was found that at screw speed of 100 rpm the shearing forces were sufficient for dispersing MFC agglomerates and the melt pressure secured evacuation of gases introduced to plasticizing system of extruder with MFC-Ac aerogel. The dynamic mechanical properties of obtained (nano)-composites were influenced by both mechanical strengthening of rigid cellulose micro and nanofibers as well as susceptibility of biopolymers towards oxidation and thermomechanical degradation during processing.

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Property enhancement of optically transparent bionanofiber composites by acetylation

Cited by 129 publications

References 16 publications

Review: current international research into cellulose nanofibres and nanocomposites

Review: current international research into cellulose nanofibres and nanocomposites

Chitin and Chitosan Nanofibers: Preparation and Chemical Modifications

Biocomposites of polyamide 4.10 and surface modified microfibrillated cellulose (MFC): influence of processing parameters on structure and thermomechanical properties

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