Homogeneous dispersion of chitin nanofibers in polylactic acid with different pretreatment methods

Li, Jingjing; Gao, Yunrong; Zhao, Jinshan; Sun, Jingrong; Li, Dagang

doi:10.1007/s10570-017-1216-y

Cited by 26 publications

(21 citation statements)

References 32 publications

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“…However, considering the whole series of measured values and the size of the error intervals, there were no significant differences in impact resistance when chitin and cellulose were combined. Although a clear change was not observed when reinforced with ChNF-MFC mixture or MFC only, it is an indication that the combination of cellulose and chitin nanofibers had no negative effect on the impact resistance of composites, corroborating the results of enhanced impact strength obtained in chitin nanofiber-reinforced PLA reported by Li et al [14]. According to their reasoning, the impact strength is obtained owing to uniformly dispersed nanofibers forming a network that absorbs large amounts of energy during the fracture.…”

Section: Resultssupporting

confidence: 87%

“…Acetylation to hydrophobize cellulose nanofibers and subsequent melt compounding from master batch did not show significant difference from non-treated nanofibers though [13]. A similar study was reported by Li et al [14] who used polyethylene glycol and polyethylene oxide to enhance dispersion of chitin nanofibers with PLA powder in aqueous suspension, and freeze-drying prior to melt compounding. However, the aqueous mixture of only nanofibers and PLA gave the best mechanical properties, confirming the negative effect of adding other substances.…”

Section: Introductionsupporting

confidence: 72%

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Polylactic Acid Reinforced with Mixed Cellulose and Chitin Nanofibers—Effect of Mixture Ratio on the Mechanical Properties of Composites

2018

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The development of all-bio-based composites is one of the relevant aspects of pursuing a carbon-neutral economy. This study aims to explore the possibility to reinforce polylactic acid by the combination of cellulose and chitin nanofibers instead of a single reinforcement phase. Polylactic acid colloidal suspension, cellulose and chitin nanofiber suspensions were mixed using only water as mixing medium and subsequently dewatered to form paper-like sheets. Sheets were hot pressed to melt the polylactic acid and form nanocomposites. The combination of cellulose and chitin nanofiber composites delivered higher tensile properties than its counterparts reinforced with cellulose or chitin nanofibers alone. Cellulose and chitin appear to complement each other from the aspect of the formation of a rigid cellulose nanofiber percolated network, and chitin acting as a compatibilizer between hydrophobic polylactic acid and hydrophilic cellulose.

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Section: Resultssupporting

confidence: 87%

Section: Introductionsupporting

confidence: 72%

Polylactic Acid Reinforced with Mixed Cellulose and Chitin Nanofibers—Effect of Mixture Ratio on the Mechanical Properties of Composites

2018

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“…The short bers in the matrix provide the points of stress concentrations, thus generating the sites for crack initiation and potential failure. 31 For the CNFs/PLA composite, the impact toughness decreases above ber content of 30 wt% due to the tendency of the agglomeration into larger aggregates at high CNFs content.…”

Section: Mechanical Propertiesmentioning

confidence: 95%

Excellent rheological performance and impact toughness of cellulose nanofibers/PLA/ionomer composite

Feng

et al. 2017

RSC Adv.

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“…Crab/prawn shells are composed of chitin and some other constituents such as proteins, lipids, calcium carbonate, and pigments. The chemical treatment of crab/prawn shell was conducted according to our previously reported methods [24]. Finally, a water suspension with 1 wt% CHNFs was passed through the grinder for 20 times with the grinding stone at 1800 rpm.…”

Section: Preparation Of Crab/prawnmentioning

confidence: 99%

Comparative Study on Properties of Polylactic Acid Nanocomposites with Cellulose and Chitin Nanofibers Extracted from Different Raw Materials

Feng

et al. 2017

Journal of Nanomaterials

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Polylactic acid (PLA) was reinforced with ultralong cellulose and chitin nanofibers extracted from four raw materials by extrusion. The mechanical, rheological, thermal, and viscoelastic performances of four nanocomposites were comparatively studied in detail. The results showed that fibrillation of poplar was much easier than that of cotton, and fibrillation of crab shell was relatively hard as compared to prawn shell. The poplar CNFs/PLA composite exhibited the best mechanical properties among four nanocomposites due to the highest aspect ratio of nanofibers, while both the cotton CNFs/PLA composite and the crab shell CHNFs/PLA composite had low mechanical strength due to the relatively low aspect ratio. FE-SEM images showed that the ultralong nanofibers were uniformly dispersed in PLA matrix for all four samples with the water preblending method. The CTE values of the nanocomposites with 40 wt% nanofibers extracted from poplar, cotton, crab shell, and prawn shell were 69.5 × 10−6 K−1, 79.6 × 10−6 K−1, 77.2 × 10−6 K−1, and 75.3 × 10−6 K−1, respectively. All the results indicated that the aspect ratio of the nanofibers has a great influence on the performance of the composites, irrespective of the composites prepared by cellulose or chitin.

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Homogeneous dispersion of chitin nanofibers in polylactic acid with different pretreatment methods

Cited by 26 publications

References 32 publications

Polylactic Acid Reinforced with Mixed Cellulose and Chitin Nanofibers—Effect of Mixture Ratio on the Mechanical Properties of Composites

Polylactic Acid Reinforced with Mixed Cellulose and Chitin Nanofibers—Effect of Mixture Ratio on the Mechanical Properties of Composites

Excellent rheological performance and impact toughness of cellulose nanofibers/PLA/ionomer composite

Comparative Study on Properties of Polylactic Acid Nanocomposites with Cellulose and Chitin Nanofibers Extracted from Different Raw Materials

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