Phosphonated nanocelluloses from sequential oxidative–reductive treatment—Physicochemical characteristics and thermal properties

Sirviö, Juho Antti; Hasa, Tapani; Ahola, Juha; Liimatainen, Henrikki; Niinimäki, Jouko; Hormi, Osmo

doi:10.1016/j.carbpol.2015.06.090

Cited by 50 publications

(45 citation statements)

References 48 publications

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“…The formation of short CNCs instead of CNFs has previously been reported to occur aer the disintegration of chemically modied DAC with an initial aldehyde content higher than 2 mmol g À1 . 31 Individualization of CNCs is thought to be due to the erosion and dissolution of amorphous regions of cellulose bers during chemical modication (during both periodate oxidation and reaction with PABA). This leads to the formation of short CNCs aer mechanical disintegration.…”

Section: Resultsmentioning

confidence: 99%

UV-absorbing cellulose nanocrystals as functional reinforcing fillers in polymer nanocomposite films

et al. 2016

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Section: Resultsmentioning

confidence: 99%

UV-absorbing cellulose nanocrystals as functional reinforcing fillers in polymer nanocomposite films

et al. 2016

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“…6b) around 90°C was associated with the evaporation of the residual humidity in the samples (Chen et al 2011). The reduction in the fiber size and the increase in the surface area led to a more rapid mass loss, a lower onset temperature, and an earlier degradation of the reference nanofibers in comparison with its micronsized fibers (Quiévy et al 2010;Sirviö et al 2015). With the WNF, this effect was more restrained, and only a minor shift to a lower temperature at the degradation peak was noted.…”

Section: Thermogravimetric Analysis (Tga)mentioning

confidence: 98%

Mechanical fabrication of high-strength and redispersible wood nanofibers from unbleached groundwood pulp

et al. 2017

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In the past, the direct production of lignincontaining nanofibers from wood materials has been very limited, and nanoscale fibers (nanocelluloses) have been mainly isolated from chemically delignified, bleached cellulose pulp. In this study, we have introduced a newly adapted, heat-intensified disc nanogrinding process for the enhanced nanofibrillation of wood nanofibers (WNF) with a high lignin content (27.4 wt%). The WNF produced this way have many unique and intriguing properties in their naturally occurring form, for example, being able to be dispersed in ethanol and having ethanol solution viscosities higher than water solution viscosities. When WNF nanopapers were formed with ethanol, the properties of the nanofibers were recoverable without a notable decrease in the viscosity or mechanical strength after redispersing them in water. The preservation of lignin in the WNF was noticed as an increase in the water contact angles (89°), the rapid removal of water in the fabrication of the nanopapers, and the enhanced strength of the nanopapers when subjected to high pressure and heat. The nanopapers fabricated from the WNF were mechanically stable, having an elastic modulus of 6.2 GPa, a maximum stress of 103.4 MPa, and a maximum strain of 3.5%. Throughout the study, characteristics of the WNF were compared to those of the delignified and bleached reference cellulose nanofibers. We envision that the exciting characteristics of the WNF and their lower cost of production compared to that of bleached cellulose nanofibers may offer new opportunities for nanocellulose and biocomposite research.

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“…10 Short nanocrystals are formed by the erosion of cellulose fiber, leading to dissolution of amorphous regions and cutting of the fibers. 39 Here, both bifunctionalized cellulose samples 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 12 108 ± 40 nm for RCNC 1 and 2, respectively. Some web-like structures containing longer cellulose nanofibrils were observed in the case of RCNC1, but RCNC2 mainly consisted of CNCs without elongated nanofibrils.…”

Section: Preparation Of Rcncsmentioning

confidence: 98%

Composite Films of Poly(vinyl alcohol) and Bifunctional Cross-linking Cellulose Nanocrystals

Sirviö

Honkaniemi

Visanko

et al. 2015

ACS Appl. Mater. Interfaces

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Long and flexible cellulose nanofibrils or stiff and short cellulose nanocrystals (CNCs) are both promising lightweight materials with high strength and the potential to serve as reinforcing agents in many polymeric materials. In this study, bifunctional reactive cellulose nanocrystals (RCNCs) with carboxyl and aldehyde functionalities were used as reinforcements to prepare acetal-bonding cross-linked poly(vinyl alcohol) (PVA) films. Two RCNCs were obtained through the mechanical homogenization of partially carboxylated dialdehyde cellulose (DAC) with a residual aldehyde content of 0.55 and 1.93 mmol/g and a carboxyl content of 1.65 and 1.93 mmol/g, respectively. The mechanical, thermal, and barrier properties of PVA-RCNC films with a variable mass ratio of RCNCs (0.5-10%) were determined. Reference CNCs without reactive aldehydes were obtained through the reduction of aldehyde functionalities to primary hydroxide groups, and their reinforcing effect was compared to RCNCs. With the addition of 10% acetal-bonding RCNCs with respect to PVA weight, the tensile strength and Young's modulus were up to 2-fold greater than those of pure PVA film. An addition of only 0.5% RCNCs improved the tensile strength of the PVA film by 66% and the modulus by 61%. In comparison, a significantly lower reinforcing effect (19% with CNC loading of 0.5%) was found using reference CNCs. PVA's effective oxygen barrier and thermal properties were preserved when RCNCs were introduced into the films.

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Phosphonated nanocelluloses from sequential oxidative–reductive treatment—Physicochemical characteristics and thermal properties

Cited by 50 publications

References 48 publications

UV-absorbing cellulose nanocrystals as functional reinforcing fillers in polymer nanocomposite films

UV-absorbing cellulose nanocrystals as functional reinforcing fillers in polymer nanocomposite films

Mechanical fabrication of high-strength and redispersible wood nanofibers from unbleached groundwood pulp

Composite Films of Poly(vinyl alcohol) and Bifunctional Cross-linking Cellulose Nanocrystals

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