Effect of wet spinning parameters on the properties of novel cellulosic fibres

Vehviläinen, Marianna; Kamppuri, Taina; Rom, Monika; Janicki, J.; Ciechańska, D.; Grönqvist, Stina; Siika‐aho, Matti; Christoffersson, Kristina Elg; Nousiainen, Pertti

doi:10.1007/s10570-008-9219-3

Cited by 64 publications

(36 citation statements)

References 11 publications

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“…The enzyme treated softwood pulp from Domsjö Fabriker AB (intrinsic viscosity 520 ml/g) was dissolved into NaOH/ZnO as published previously by Vehviläinen et al 2008. The preparation of this solution is described in the patent application of Vehviläinen et al (2009).…”

Section: Methodsmentioning

confidence: 99%

“…First dissolutions in NaOH were already done in 1939 by Sobue et al In addition, various aqueous alkaline solvent systems, such as aqueous NaOH/urea, NaOH/thiourea, NaOH/urea/ thiourea (Zhou and Zhang 2001;Ruan et al 2004;Zhang 2005, 2006;Cai et al 2007;Yan et al 2007;Qi et al 2008;Zhang et al 2010) LiOH/urea (Cai and Zhang 2005) and NaOH/ZnO (Vehviläinen et al 2008;Liu et al 2011) can dissolve cellulose completely, even cellulose grades with relatively high DP (DP = 500-900) (Ruan et al 2004;Cai and Zhang 2005;Qi et al 2008Qi et al , 2011. The addition of substances such like urea, thiourea or zinc oxide are reported to be helping cellulose dissolution and work as a solution stabilizer against gelation.…”

Section: Introductionmentioning

confidence: 99%

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Blending cellulose with polyethylene-co-acrylic acid in alkaline water suspension

et al. 2012

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Alkaline solutions of cellulose and polyethylene-co-acrylic acid (PE-co-AA) were mixed in order to prepare homogeneous cellulose/PE-co-AA blends. Different mixing methods were tested and the evolution of solutions was characterized by rheological methods and optical microscopy. In addition to the solution stage studies, the precipitated dry blends were characterized by Differential Scanning Calorimetry, Scanning Electron Microscopy, Fourier Transform Infrared and Dynamic Mechanical Analysis. Mixing the solutions led to the formation of a suspension, consisting of PE-co-AA particles dispersed evenly throughout the cellulose solution. Based on the conducted studies, it became clear that a uniform quality and the best mixing were attained with a method in which the suspension was frozen and melted between the mixing. In dry blends the polymers were found to be mixed on 1 lm scale, and the crystallization temperature of the PE-co-AA phase was increased *6°C due to the nucleation ability of the cellulose phase.

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Blending cellulose with polyethylene-co-acrylic acid in alkaline water suspension

et al. 2012

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“…% NaOH and 0.84 wt. % ZnO at 3°C, then spun into 15 % sulphuric acid (Vehviläinen et al 2008). All these data are not coming from pure cellulose sample, but from wood pulps and cotton linters.…”

Section: Limit Of Solubilitymentioning

confidence: 99%

Dissolution mechanisms of wood cellulose fibres in NaOH–water

2009

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Abstract. Four wood pulps and a microcrystalline cellulose were dissolved in a NaOH 8% -water solution. Insoluble fractions and clear solution fractions were isolated by centrifugation and were observed by optical microscopy and transmission electron microscopy. Molecular weight distribution, carbohydrate composition and cellulose II content were measured. The dissolution of wood cellulose fibres in NaOH 8% -water solutions occurs by successive dismantlement and fragmentation steps governed by the swelling and the shearing of the original structure. The cellulose from insoluble and clear solution fractions is in both case converted in cellulose II and the insoluble fractions contain embedded mannans. Besides, the molecular weight distributions of cellulose from insoluble and clear solution fractions reveal the existence of heterogeneities in dissolution capacity of the cellulose chains, independent to the degree of polymerization, which are related to the chemical environment of the chains in the fibre structure.

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“…Hardwood dissolving pulp can be treated with purified Trichoderma reesei endoglucanases, which makes the pulp soluble to alkali (Rahkamo et al 1996). This enzyme-assisted method can be used in an environmentally friendly way for preparing fibers (Vehviläinen et al 2008), films such as cellophane, and membranes with cellulose or cellulose-containing composites in water-based solutions.…”

Section: Introductionmentioning

confidence: 99%

Strength and Barrier Enhancements of Cellophane and Cellulose Derivative Films: A Review

Paunonen

2013

BioResources

121

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Cellulose derivatives, i.e. cellulose functionalized in a solvent state with various side groups, are an important source of biomaterials for food packaging. This review considers the following materials: i) cellophane, ii) cellulose acetate, iii) methylcellulose, and iv) carboxymethylcellulose. Mechanical and barrier properties are important for freestanding packaging films as well as for coatings. The potential of the selected cellulose derivatives and cellophane is thus examined from the viewpoint of their tensile properties as well as their moisture and oxygen barrier properties. The capacity of microcrystalline cellulose and nano-sized celluloses to reinforce the films and to help impede gas diffusion is examined for microfibrillar celluloses, nanocrystalline celluloses, and whiskers. Very good oxygen barrier properties have been reported for cellophane. Nanocellulose fillers have regularly been shown to enhance the tensile properties of several cellulose derivatives, but the effects on the water vapor permeability (WVP) have been studied less often.

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Effect of wet spinning parameters on the properties of novel cellulosic fibres

Cited by 64 publications

References 11 publications

Blending cellulose with polyethylene-co-acrylic acid in alkaline water suspension

Blending cellulose with polyethylene-co-acrylic acid in alkaline water suspension

Dissolution mechanisms of wood cellulose fibres in NaOH–water

Strength and Barrier Enhancements of Cellophane and Cellulose Derivative Films: A Review

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