Nanofibrillated cellulose originated from birch sawdust after sequential extractions: a promising polymeric material from waste to films

Liu, Jun; Korpinen, Risto; Mikkonen, Kirsi S.; Willför, Stefan; Xu, Chunlin

doi:10.1007/s10570-014-0321-4

Cited by 63 publications

(47 citation statements)

References 31 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…The CNFs were produced by TEMPO-mediated oxidation using different amounts of NaClO (3, 5, 6.7 and 10 mmol/g fibre) at pH 10.5 [49]. The carboxylic content of CNFs was determined by the electric conductivity titration method, using 50 mg of dried CNFs dispersed in deionized water (0.1 wt%).…”

Section: Methodsmentioning

confidence: 99%

“…The carboxylic content of CNFs was determined by the electric conductivity titration method, using 50 mg of dried CNFs dispersed in deionized water (0.1 wt%). After the addition of 2 mL of 0.1 M HCl and 1 mL 50 nM NaCl, the suspension was subsequently titrated with 0.1 M NaOH until pH 11.5 was reached [49].…”

Section: Methodsmentioning

confidence: 99%

“…Neat films were prepared from all the CNFs using a vacuum filtration method [49]. The mechanical properties of the films were determined and are listed in Table 4.…”

Section: Mechanical Properties Of the Neat Cnf Filmsmentioning

confidence: 99%

See 2 more Smart Citations

Transparent nanocellulose-pigment composite films

et al. 2015

Self Cite

View full text Add to dashboard Cite

Biodegradable coatings and films of cellulose nanofibers (CNFs) or a combination of CNFs and inorganic fillers, such as clay or calcium carbonate (CaCO 3 ), can provide a replacement for non-biodegradable plastic coatings as barrier layers in packaging boards. In this work, transparent composite films were prepared from CNFs of Pinus radiata and Eucalyptus using different amounts of clay and CaCO 3 as fillers. The impact of raw material (softwood vs. hardwood), TEMPO oxidation levels and filler type (clay vs. CaCO 3 ) on film properties was studied. Pinus radiata CNF films had superior mechanical properties to Eucalyptus CNF films, but no significant differences were observed in the barrier and optical properties. Clay seemed to work better as filler compared to CaCO 3 , in terms of its impact on film properties. Composite films with CaCO 3 as filler were highly brittle with inferior properties to clay-CNF films, and an uneven distribution and agglomeration of the CaCO 3 mineral particles was evident in SEM images. Based on the results, clay as filler in CNF coatings is preferred for targeting packaging board applications. Rheological characterisation of the CNF suspensions revealed shear-thinning behaviour, with the CNF from Eucalyptus having higher viscosities and lower power-law indices when compared to the CNF from P. radiata.

show abstract

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

See 1 more Smart Citation

Transparent nanocellulose-pigment composite films

et al. 2015

Self Cite

View full text Add to dashboard Cite

show abstract

“…Sawdust is a by-product of wood processing (Liu et al 2014). It is generated in large amounts and used to produce charcoal, to absorb toxic compounds and as a filler in plastics and paperboard etc.…”

Section: Resultsmentioning

confidence: 99%

Comparison of digestibility of wood pulps produced by the sulfate and TMP methods and woodchips of various botanical origins and sizes

et al. 2015

View full text Add to dashboard Cite

Poplar and pine cellulosic pulps derived by the sulfate process (Kappa numbers of 15.4 and 31.4, respectively) and a poplar thermomechanical pulp (TMP, Kappa number of 124.7) as well as 0.43-0.8 mm woodchips of various botanical origins (poplar, birch, lime, oak, beech, pine, and spruce) and poplar chips of five different average particle sizes, ranging from 1.6-2.0 to\0.43 mm, were digested by a commercial preparation of cellulases and xylanases (NS-22086 from Novozymes). Yields of reducing sugars derived by enzymatic hydrolysis of the poplar and pine pulps that were obtained by the sulfate method achieved 100 and 89 % on a dry weight basis (52.3 and 35.9 % d.w. wood, respectively) while glucose yields reached 79 and 70.7 % d.w. pulp (41.3 and 28.6 % d.w. wood), respectively. Enzymatic hydrolysis of the pine TMP resulted in glucose and reducing sugars yields of only 14.0 and 36.7 % d.w. pulp (around 13 and 34 % d.w. wood, respectively). Yields of glucose and soluble reducing sugars released from the poplar chips were inversely proportional to their size and varied between around 5.3-7.8, and 15.7-22.4 % d.w., respectively. Reducing sugars yields from beech, birch and lime chips were slightly higher than from the poplar chips of the same size while pine, spruce and oak chips were less susceptible to enzymatic digestion. The dominating sugars in the hydrolysates of woodchips were glucose and cellobiose (70-90 % w/w of the sum of 5 detected sugars) while mannose, xylose and arabinose concentrations were relatively low.

show abstract

“…To increase the surface charge density, F-CNC samples were modified by TEMPO-mediated oxidation (Liu, Korpinen, Mikkonen, Willför, & Xu, 2014).…”

Section: Surface Modification Of F-cnc By Tempo-mediated Oxidationmentioning

confidence: 99%

Cellulose nanocrystals prepared via formic acid hydrolysis followed by TEMPO-mediated oxidation

Kronlund

et al. 2015

Carbohydrate Polymers

Self Cite

196

103

View full text Add to dashboard Cite

Cellulose nanocrystals (CNCs) as a renewable and biodegradable nanomaterial have wide application value. In this work, CNCs were extracted from bleached chemical pulp using two stages of isolation (i.e. formic acid (FA) hydrolysis and 2,2,6,6-tetramethyl-piperidine-1-oxyl (TEMPO) mediated oxidation) under mild conditions. In the first stage, FA was used to remove hemicellulose, swell cellulose fibers, and release CNCs. The FA could be readily recovered and reused. In the second stage, the CNCs isolated by FA were further modified by TEMPO-mediated oxidation to increase the surface charge of CNCs. It was found that the modified CNCs with more ordered crystal structure and higher surface charge had better redispersibility and higher viscosity in aqueous phase. Therefore, the modified CNCs could be more effective when used as rheology modifier in the fields of water based coating, paint, food etc.

show abstract

Nanofibrillated cellulose originated from birch sawdust after sequential extractions: a promising polymeric material from waste to films

Cited by 63 publications

References 31 publications

Transparent nanocellulose-pigment composite films

Transparent nanocellulose-pigment composite films

Comparison of digestibility of wood pulps produced by the sulfate and TMP methods and woodchips of various botanical origins and sizes

Cellulose nanocrystals prepared via formic acid hydrolysis followed by TEMPO-mediated oxidation

Contact Info

Product

Resources

About