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Riechers J.,Herrenknecht Formwork Technology GmbH | Lueghamer A.,AGRU Kunststofftechnik GmbH | Recher G.,Telene SAS
ITA-AITES World Tunnel Congress 2016, WTC 2016 | Year: 2016

Despite comparable standards with regards to protective membranes and gaskets, specified in tender documents, different methodologies are known and in use for protection and hydraulically optimization of segmental lined tunnels, achievable in two passes or one pass. Based on detailed monitoring of key materials and systems involved, the combi segments type II HDPE, an adaptable protective system for constructions on one pass, has been developed. The objection of this paper was to discuss this integral protective lining system in respect of material characteristics and its adaptability to both project and customers' demands. Reviewed performances show outstanding capabilities of the Liner System and its potential for future feature extensions. After realization of first reference projects applying the new combi segments lining panels, further publications will follow including practical experience reports of panel fabrication, segment production and tunnel installation. Copyright © (2016) by the Society for Mining, Metallurgy and Exploration. All rights reserved.

Monsaert S.,Ghent University | Ledoux N.,Ghent University | Drozdzak R.,Telene SAS | Verpoort F.,Ghent University
Journal of Polymer Science, Part A: Polymer Chemistry | Year: 2010

A ruthenium Schiff base catalyst (5), bearing an Nheterocyclic carbene ligand, was found to be a latent catalyst for the ring-opening metathesis polymerization of cis,cis-1,5- cyclooctadiene and dicyclopentadiene and is activated efficiently on addition of hydrochloric acid. A benchmark study was performed using the Grubbs first (1), second (2), and third (3) generation catalyst. Results further illustrate that the catalyst can be stored in dicyclopentadiene at a monomer/catalyst ratio of 15,000/1 without any significant polymerization during at least 12 months. After activation of the catalyst with a Brønsted acid, no undesired loss of performance can be detected. This concept of activation can be easily adapted to a Reaction Injection Molding process, and reaction control is obtained via the in situ generation of the cocatalyst as the outcome of the reaction of alcohols with Lewis acids. Insight into the activation mechanism was gained through an in-depth nuclear magnetic resonance study, and a plausible mechanism is proposed. © 2009 Wiley Periodicals, Inc.

Drozdzak R.,Telene SAS | Nishioka N.,RIMTEC Corporation | Recher G.,RIMTEC Corporation | Verpoort F.,Ghent University
Macromolecular Symposia | Year: 2010

Advances in design of latent ruthenium phenylindenylidene catalysts bearing salicylaldimine ligands for ring-opening metathesis polymerization are described. The presence of the substituents in ortho position in N-aryl ring of salicylaldimine ligand has been found to be the main factor determining the catalyst stability. The best of the studied catalysts after acid activation offers activity comparable to that of the dichloride systems in ring-opening metathesis polymerization of DCPD, while maintaining very high stability in the monomer solution. Copyright © 2010 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.

Vallons K.A.M.,Catholic University of Leuven | Drozdzak R.,Telene SAS | Charret M.,Telene SAS | Lomov S.V.,Catholic University of Leuven | Verpoest I.,Catholic University of Leuven
Composites Part A: Applied Science and Manufacturing | Year: 2015

The use of a tough thermoset polydicyclopentadiene (PDCPD) as a matrix material for composites was explored. A PDCPD-glass fibre composite and an equivalent epoxy composite were compared. Fibre-matrix adhesion quality was assessed by transverse bending tests. The materials were subjected to compression tests, impact tests, static tensile tests and tensile fatigue tests. The results indicate that the tough behaviour of the PDCPD matrix markedly influences the composite damage resistance. The size of the impact damage in the PDCPD composite was half of that in the epoxy composite. The tensile tests indicated no significant difference in tensile strength, but the damage before failure was found to be much more severe in the epoxy samples. The fatigue results showed a much lower variation in fatigue life for the PDCPD material than for the epoxy material, as well as clear differences in damage development for the two materials. © 2015 Elsevier Ltd. All rights reserved.

The present invention relates to a catalytic complex for olefin metathesis reactions, to a process for its preparation and to its use in olefin metathesis reactions, particularly in ring opening metathesis polymerisation (ROMP) reactions.

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