Picken S.J.,Technical University of Delft |
Sikkema D.J.,Mxpolymers |
Boerstoel H.,Teijin Aramid |
Dingemans T.J.,Technical University of Delft |
van der Zwaag S.,Technical University of Delft
Liquid Crystals | Year: 2011
The chemistry and physics of high-performance fibre spinning based on main-chain liquid crystal polymer (MCLCP) solutions and melts is discussed, which is the largest industrial application of liquid crystal technology. The high modulus and strength of liquid crystal polymer-based high-performance fibres is due to the exceptionally high orientational order that can be achieved, reaching values of 0.95 and higher. Together with the chemistry that ensures strong intermolecular interactions, often based on hydrogen bonding, it is possible to make fibres with unusual mechanical and thermal properties. The modulus and strength of such fibres can reach values at about 50-75% of the theoretical limit.Within materials science high-performance fibres are especially interesting, as they are one of the few systems where the material properties can be successfully predicted based on molecular models for the orientational order together with rather simple assumptions on the effect of flow on the director alignment. The most studied MCLCP systems for high-performance fibre spinning PPTA/H 2SO 4, cellulose/phosphoric acid, PIPD(M5)/PPA and melt-spun Vectran™ are discussed. © 2011 Taylor & Francis.
Piraux L.,Catholic University of Louvain |
Abreu Araujo F.,Catholic University of Louvain |
Bui T.N.,Catholic University of Louvain |
Otto M.J.,Teijin Aramid |
Issi J.-P.,Catholic University of Louvain
Physical Review B - Condensed Matter and Materials Physics | Year: 2015
Measurements of the electrical resistivity, from 1.5 to 300 K, and of the low temperature magnetoresistance of highly conductive carbon nanotube (CNT) fibers, obtained by wet-spinning from liquid crystalline phase (LCP), are reported. At high temperature the results obtained on the raw CNT fibers show a typical metallic behavior and the resistivity levels without postdoping process were found to be only one order of magnitude higher than the best electrical conductors, with the specific conductivity (conductivity per unit weight) comparable to that of pure copper. At low temperature a logarithmic dependence of the resistivity and the temperature dependence of the negative magnetoresistance are consistent with a two-dimensional quantum charge transport - weak localization and Coulomb interaction - in the few-walled CNT fibers. The temperature dependence of the phase-breaking scattering rate has also been determined from magnetoresistance measurements. In the temperature range T<100K, electron-electron scattering is found to be the dominant source of dephasing in these highly conductive CNT fibers. While quantum effects demonstrate the two-dimensional aspect of conduction in the fibers, the fact that it was found that their resistance is mainly determined by the intrinsic resistivity of the CNTs - and not by intertube resistances - suggests that better practical conductors could be obtained by improving the quality of the CNTs and the fiber morphology. © 2015 American Physical Society.
Semin N.V.,Technical University of Delft |
Poelma C.,Technical University of Delft |
Drost S.,Teijin Aramid |
Westerweel J.,Technical University of Delft
Measurement Science and Technology | Year: 2010
The potential of in-line digital holography to locate and measure the size and position of filaments, i.e. thin wire-like objects, distributed throughout a thick volume has been investigated. In this paper two approaches are introduced to study filaments of varying diameter. (1) It is shown analytically and experimentally that for a gradual variation of filament diameter, one-dimensional Fraunhofer diffraction theory can be applied with an accuracy of 5% to filaments with a diameter of 60-100 νm; the x and z positions of filaments in a bundle can be determined with 0.1 mm and 0.3 mm accuracy respectively. (2) The out-of-focus plane approach has been modified and applied to a simple bundle of filaments for the case when their diffraction patterns can no longer be distinguished individually on the hologram. An accuracy of 20% in measuring diameter and 0.3 mm to detect the position is reported. Limitations as well as suggestions to further improve the technique are discussed. © 2010 IOP Publishing Ltd.
Wender G.,BigLift Shipping |
Van Zonneveld W.,FibreMax |
Van Leeuwen M.,Teijin Aramid |
Te Velthuis M.,Huisman Equipment
RINA, Royal Institution of Naval Architects - International Conference on Marine Heavy Transport and Lift III | Year: 2012
A 350mT Super Fly Jib was developed for BigLift Shipping to install two shuttle trusses in the harbour of Port Hedland, Australia. The biggest challenge within this project was to install this heavy piece of equipment within short notice and with limited tooling. A solution was found in light weight Fibre Ropes produced with endless winding technology. © 2012: The Royal Institution of Naval Architects.
Manda B.M.K.,University Utrecht |
Bosch H.,Royal DSM |
Karanam S.,SABIC |
Beers H.,Teijin Aramid |
And 4 more authors.
Journal of Cleaner Production | Year: 2016
Businesses have a responsibility to shareholders and other stakeholders. By establishing a direct link between sustainability and shareholder value, businesses can successfully include sustainability considerations in managerial decisions and create sustainable value. The value creation opportunities include cost reduction, risk reduction, product differentiation, and new products to address unsatisfied needs. However, the relevance of various aspects of sustainability changes from company to company depending on the context; this can involve the type of product systems, geographical scope, and related social and environmental drivers. This requires a framework and tool that can capture the complexity, yet provide holistic understanding of the interdependence of industrial systems and, more importantly, furnish sound metrics to include sustainability considerations in business decisions. This paper shows how value can be created by integrating environmental sustainability through Life Cycle Assessment in business, especially in the chemical industry and provides an implementation procedure for business value creation based on life cycle assessment. The application of life cycle assessment was contextualized to various drivers and situations of chemical companies with the help of sustainable value framework. Case studies from three companies were used to illustrate value creation by integrating environmental sustainability through life cycle assessment. A procedure was presented to translate life cycle assessment insights into value creation opportunities. This article provides a better understanding of employing life cycle assessment by business managers in day-to-day business decisions to create value. © 2016 Elsevier Ltd.