Wood fibres turn up in a wide range of products. In addition to traditional paper and wood-based materials, they are also used for example in the food, textile and pharmaceutical industries. The scope of application of wood fibre could, however, be vastly broader than it is at present. With this objective in sight, new avenues are being opened up by cellulose-based nanofibres, which can be used to produce extremely strong and modifiable materials. These efforts are backed by growing pressures such as environmental requirements which lend ever stronger support to the demand for wider utilisation of new natural, fibre-based materials in future.

“Forest cluster companies operating in Finland are on the look out for new forest products. In order to be able to meet the challenges of these companies we need to improve the current level of know-how in wood-based products and wood processing at molecular level. New territory has been charted for example in the areas of composite and nanomaterials,” says Professor Janne Laine of the Helsinki University of Technology’s Department of Forest Products Technology.

Interest in cellulose-based nanofibres is primarily driven by its environmental value as a biomaterial. It is also known that nanomaterials can be used, for example, to achieve strength properties which are not attainable with particles of bigger size classes. Furthermore, the smaller the particle is, the bigger the surface area, which in turn increases the desired interactivity with other materials.

“One of the main application targets for new materials is the car industry, which wants to use lightweight cellulose fibres in car interior panelling. Estimates in terms of volume of the natural fibre requirement of the European car industry in 2010 are extremely substantial,” says Laine.

Professor Laine’s research team is one of five teams involved in examining and developing cellulose-based nanofibres as part of the Finnish-Swedish Wood Material Science and Engineering research programme.

According to Professor Janne Laine, the Nanostructured Cellulose Products research project has shown that wood fibre can be used to make an extremely versatile range of materials, both for traditional wood processing industry products as well as for totally new applications.

Cellulose fibres (30 &grkmu;m wide, 2–3 mm long) consist of nanometre-scale microfibrils (4 nm wide, 100–200 nm long).

The chief objective of the project has been to produce uniform quality nanofibre (microfibrillated cellulose, MFC) from cellulose fibres by combining enzymatic or chemical treatment with mechanical processing. The second objective has been to attempt to functionalise the surfaces of the microfibrils, e.g. by means of polymers in order to be able to utilise the converted fibrils in as many materials as possible. The third objective has been to demonstrate how cellulose fibrils can give totally new properties to a range of different materials.

The project has achieved an 80% reduction in the energy requirement of microfibrillar cellulose manufacture as compared to levels formerly claimed in literature. In addition, enzymatic pre-treatment combined with specific mechanical treatments has produced microfibrils of extremely high and uniform quality.

“We’ve succeeded in modifying the surfaces of microfibrils e.g. by means of different polymers, which has, for instance, enabled us to make their surfaces more electrically charged. Microfibrils give considerable toughness and strength to traditional paper products even in small quantities. Correspondingly, microfibrils, as so-called nanocomposite structures, form an extremely high-strength material (e.g. film) the plasticity (elasticity) of which is possible to regulate for example by means of starch,” says Laine.

“Cellulose microfibrils can also be used to make ultra-light materials. By combining fibrils with conductive polymers, we’ve been able to make cellulose based structures which conduct electricity. It has also been possible to coat microfibrils with a thin layer of titanium dioxide, which makes the material photocatalytically active. Titanium dioxide coated microfibrillar cellulose could be used, for instance, in solar cells and applications in which self-cleaning surfaces are needed, such as filters.”

Nanostructured Cellulose Products (NanoCell) project participants

Organisations:
Swedish Pulp and Paper Research Institute (STFI), The Royal Institute of Technology (KTH), Helsinki University of Technology (TKK)

Companies:
Billerud, Bim Kemi AB, Domsjö fabriker AB, EKA Chemicals AB, Frantschach Pulp & Paper Austria AG, Holmen Paper, Kemira, Korsnäs, M-real, Norske Skog, SCA, StoraEnso, UPM-Kymmene, Voith Paper GmbH & Co KG.

Wood Material Science and Engineering Research Programme

The multidisciplinary projects focusing on basic research involved in the Finnish–Swedish research programme Wood Material Science and Engineering have studied the raw material properties of wood and means to improve the material properties of wood and fibres. The ongoing projects focusing on innovation-targetted research and development process and develop wood raw material into innovative and eco-efficient products, materials and processes, e.g. for the use in construction, packing, pharmaceutical and food industries. The programme ends in 2007. Projects within the programme are funded with a total of €20 million.

The Wood Material Science Research Programme is jointly funded by Finnish and Swedish funding bodies and industry. Research projects within the sub-programme for basic research are funded by the Academy of Finland, Tekes, Finnish Funding Agency for Technology and Innovation, the Ministry of Agriculture and Forestry of Finland and the Swedish Research Council for Environment, Agricultural Sciences and Spatial Planning (Formas). The sub-programme for innovation-targeted research and development is funded by Tekes and the Swedish Agency for Innovation Systems (Vinnova).

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