The Experts below are selected from a list of 69 Experts worldwide ranked by ideXlab platform
Herbert Sixta - One of the best experts on this subject based on the ideXlab platform.
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high strength composite fibers from cellulose lignin blends regenerated from ionic liquid solution
Chemsuschem, 2015Co-Authors: Shirin Asaadi, Leenasisko Johansson, Patrik Ahvenainen, Mehedi Reza, Marina Alekhina, Lauri Rautkari, Anne Michud, Lauri K J Hauru, Michael Hummel, Herbert SixtaAbstract:Composite Fibres that contain cellulose and lignin were produced from ionic liquid solutions by dry-jet wet spinning. Eucalyptus dissolving pulp and organosolv/kraft lignin blends in different ratios were dissolved in the ionic liquid 1,5-diazabicyclo[4.3.0]non-5-enium acetate to prepare a spinning dope from which composite Fibres were spun successfully. The composite Fibres had a high strength with slightly decreasing values for Fibres with an increasing share of lignin, which is because of the reduction in crystallinity. The total orientation of composite Fibres and SEM images show morphological changes caused by the presence of lignin. The hydrophobic contribution of lignin reduced the vapour adsorption in the Fibre. Thermogravimetric analysis curves of the composite Fibres reveal the positive effect of the lignin on the Carbonisation yield. Finally, the composite Fibre was found to be a potential raw material for textile manufacturing and as a precursor for Carbon Fibre Production.
Shirin Asaadi - One of the best experts on this subject based on the ideXlab platform.
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high strength composite fibers from cellulose lignin blends regenerated from ionic liquid solution
Chemsuschem, 2015Co-Authors: Shirin Asaadi, Leenasisko Johansson, Patrik Ahvenainen, Mehedi Reza, Marina Alekhina, Lauri Rautkari, Anne Michud, Lauri K J Hauru, Michael Hummel, Herbert SixtaAbstract:Composite Fibres that contain cellulose and lignin were produced from ionic liquid solutions by dry-jet wet spinning. Eucalyptus dissolving pulp and organosolv/kraft lignin blends in different ratios were dissolved in the ionic liquid 1,5-diazabicyclo[4.3.0]non-5-enium acetate to prepare a spinning dope from which composite Fibres were spun successfully. The composite Fibres had a high strength with slightly decreasing values for Fibres with an increasing share of lignin, which is because of the reduction in crystallinity. The total orientation of composite Fibres and SEM images show morphological changes caused by the presence of lignin. The hydrophobic contribution of lignin reduced the vapour adsorption in the Fibre. Thermogravimetric analysis curves of the composite Fibres reveal the positive effect of the lignin on the Carbonisation yield. Finally, the composite Fibre was found to be a potential raw material for textile manufacturing and as a precursor for Carbon Fibre Production.
Jan-anders E. Månson - One of the best experts on this subject based on the ideXlab platform.
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economic and environmental assessment of alternative Production methods for composite aircraft components
Journal of Cleaner Production, 2012Co-Authors: Robert A. Witik, Fabrice Gaille, Rémy Teuscher, Heike Ringwald, Veronique Michaud, Jan-anders E. MånsonAbstract:The use of Carbon Fibre reinforced plastics is steadily increasing in the aerospace industry as rising fuel costs and concerns over the environment push airframe manufacturers to improve aircraft efficiency. The high costs associated with manufacturing Carbon Fibre reinforced components in autoclaves have prompted interest in alternative out-of-autoclave processing methods. In this study a combined cost modelling and life-cycle assessment approach is applied to selected out-of-autoclave Production scenarios. Out-of-autoclave specific "prepregs" and resin infused fabrics are cured in thermal and microwave ovens of comparable volume and assessed against a benchmark autoclave scenario. Results showed that materials, in particular Carbon Fibres, contributed most significantly to component cost and environmental impacts. Resin infusion processes were effective at reducing costs, as reinforcement fabrics and resin were less expensive. Due to the small contribution of energy to total cost, reductions in energy use did not lead to significant savings, although they did improve the environmental performance of the manufacturing process. Out-of-autoclave specific prepregs did not perform as well due to their higher costs, longer associated cycle times and the need for lengthy de-bulking operations. Microwave oven curing offered little in terms of cost reduction and environmental improvement as investment costs were comparable to those of an autoclave, and energy consumption was relatively high compared with traditional thermal oven use. Opportunities for improvement exist if investment costs can be reduced and additional work carried out to promote more efficient transfer of energy. Improvement of the Carbon Fibre Production process would be the most effective approach for reducing impacts and costs from Carbon Fibre components. (C) 2012 Elsevier Ltd. All rights reserved.
Leenasisko Johansson - One of the best experts on this subject based on the ideXlab platform.
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high strength composite fibers from cellulose lignin blends regenerated from ionic liquid solution
Chemsuschem, 2015Co-Authors: Shirin Asaadi, Leenasisko Johansson, Patrik Ahvenainen, Mehedi Reza, Marina Alekhina, Lauri Rautkari, Anne Michud, Lauri K J Hauru, Michael Hummel, Herbert SixtaAbstract:Composite Fibres that contain cellulose and lignin were produced from ionic liquid solutions by dry-jet wet spinning. Eucalyptus dissolving pulp and organosolv/kraft lignin blends in different ratios were dissolved in the ionic liquid 1,5-diazabicyclo[4.3.0]non-5-enium acetate to prepare a spinning dope from which composite Fibres were spun successfully. The composite Fibres had a high strength with slightly decreasing values for Fibres with an increasing share of lignin, which is because of the reduction in crystallinity. The total orientation of composite Fibres and SEM images show morphological changes caused by the presence of lignin. The hydrophobic contribution of lignin reduced the vapour adsorption in the Fibre. Thermogravimetric analysis curves of the composite Fibres reveal the positive effect of the lignin on the Carbonisation yield. Finally, the composite Fibre was found to be a potential raw material for textile manufacturing and as a precursor for Carbon Fibre Production.
Michael Hummel - One of the best experts on this subject based on the ideXlab platform.
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high strength composite fibers from cellulose lignin blends regenerated from ionic liquid solution
Chemsuschem, 2015Co-Authors: Shirin Asaadi, Leenasisko Johansson, Patrik Ahvenainen, Mehedi Reza, Marina Alekhina, Lauri Rautkari, Anne Michud, Lauri K J Hauru, Michael Hummel, Herbert SixtaAbstract:Composite Fibres that contain cellulose and lignin were produced from ionic liquid solutions by dry-jet wet spinning. Eucalyptus dissolving pulp and organosolv/kraft lignin blends in different ratios were dissolved in the ionic liquid 1,5-diazabicyclo[4.3.0]non-5-enium acetate to prepare a spinning dope from which composite Fibres were spun successfully. The composite Fibres had a high strength with slightly decreasing values for Fibres with an increasing share of lignin, which is because of the reduction in crystallinity. The total orientation of composite Fibres and SEM images show morphological changes caused by the presence of lignin. The hydrophobic contribution of lignin reduced the vapour adsorption in the Fibre. Thermogravimetric analysis curves of the composite Fibres reveal the positive effect of the lignin on the Carbonisation yield. Finally, the composite Fibre was found to be a potential raw material for textile manufacturing and as a precursor for Carbon Fibre Production.