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Ronse, Belgium

Ciera L.,Ghent University | Beladjal L.,Terrestrial Ecology Unit | Almeras X.,Devan Chemicals | Gheysens T.,European Space Agency | And 4 more authors.
Fibres and Textiles in Eastern Europe | Year: 2014

Owing to the current demand for textiles with new functionalities and improved properties, there has been a continuous effort to modify Polyethylene terephthalate (PET) materials. In our previous study, we demonstrated that Bacillus amyloliquefaciens spores can be incorporated into PET fibres during extrusion. However, the extent to which they can be incorporated without fundamentally changing the properties of the fibres is unknown. In this work, scanning electron microscopy (SEM), transmission electron microscopy (TEM), optical microscopy (OM), differential scanning calorimetry (DSC), a Favimat tensile tester, and Raman and Fourier transform infrared spectroscopy (FT-IR) were used to study the properties of PET/spore fibres. The tensile strength, Young's modulus and elongation at break were dependent on the spore concentration. Additionally the degree of crystallinity increased slightly, whereas the melting and crystallisation temperatures remained constant at all spore concentration levels. Nevertheless the properties of the fibres fall within the acceptable range of variation and are found to be as good as normal PET fibres. Source


Salaun F.,University of Lille Nord de France | Salaun F.,French National Graduate School of Textile Engineering | Creach G.,University of Lille Nord de France | Creach G.,French National Graduate School of Textile Engineering | And 3 more authors.
Polymers for Advanced Technologies | Year: 2013

A microencapsulated flame retardant with a melamine-formaldehyde shell was prepared by in situ polymerization, then incorporated into an iPP matrix with a coupling agent to manufacture multifilament yarns by melt spinning. The influence of the post-treatment on the resulted microcapsules with an alcoholic solution was also studied. The spinnability of these formulations based on the interface characterization from contact angle measurements, tensile test and thermal characterizations was explored to determine the maximum draw ratio (DR) to apply. Finally, knitted fabrics were processed from multifilaments, and their flame-retardant properties were evaluated by performing fire tests according to the FMVSS 302 and Din 4102 part B experiments. The different mechanical and thermal behaviors were discussed in terms of the influence of the DR and the post-treatment applied on fibers during the spinning process and during the recovery of the microcapsules, respectively. The results showed that it was possible to obtain multifilament yarns with a DR of 4, but the best properties were obtained with a DR of 3 and for un-treated microcapsules. Furthermore, the samples containing un-treated microcapsules reach a B rating at the FMVSS test with a fast flame progression and a very low duration of burning. © 2012 John Wiley & Sons, Ltd. Source


Rault F.,University of Lille Nord de France | Rault F.,French National Graduate School of Textile Engineering | Giraud S.,University of Lille Nord de France | Giraud S.,French National Graduate School of Textile Engineering | And 3 more authors.
Polymers | Year: 2015

The efficiency of new phosphinates, in combination with melamine cyanurate, was studied using different polypropylene textile structures. The influence of different ratios up to a total amount of 6 wt% in the polypropylene fiber was investigated using the limiting oxygen index (LOI) and cone calorimeter method for research purposes, while the performances were correlated to the standards FMVSS 302 (Federal Motor Vehicle Safety Standards) and DIN 4102-l (Deutsches Institut für Normung) used more specifically for automotive and building sector. © 2015 by the authors. Source


Chatterjee S.,University of Lille Nord de France | Chatterjee S.,French National Graduate School of Textile Engineering | Salaun F.,University of Lille Nord de France | Salaun F.,French National Graduate School of Textile Engineering | And 4 more authors.
Carbohydrate Polymers | Year: 2012

The microcapsules with oil core and multi-layers shell were developed from poly-cationic chitosan (CS) and anionic SDS in multistep electrostatic layer by layer deposition technique combined with oil in water emulsification process. The net charge of microcapsules determined by zeta potential indicated that microcapsules are highly positive charged because of poly-cationic nature of CS, and charge neutralization of microcapsules occurred after alkali treatment. The granulometry measurement showed increase in average diameter of microcapsules by alkali treatment suggesting swelling or formation of small aggregates. The morphology analysis of microcapsules by optical microscopy corroborated the results of granulometry, and diameter of microcapsules was found to be decreased in multistep process due to tight packing of layers in outer shell of microcapsules. The alkali treatment of microcapsules to solidify outer shell was optimized with 0.02 N NaOH to reduce microcapsules aggregation and gel formation by CS chains as found in optical micrographs. © 2012 Elsevier Ltd. All rights reserved. Source


Chatterjee S.,University of Lille Nord de France | Chatterjee S.,French National Graduate School of Textile Engineering | Salaun F.,University of Lille Nord de France | Salaun F.,French National Graduate School of Textile Engineering | And 6 more authors.
Polymer Bulletin | Year: 2014

The present study focused on formation of chitosan (CS) droplets particles/microcapsules by ionic gelation method with sodium dodecylsulfate (SDS) for encapsulating linseed oil as active substance. Chitosan droplet particles with four alternate layers of CS and SDS were developed from oil in water emulsion using SDS as an anionic emulsifier. The process was optimized by zeta potential measurements to avoid overcharging of particles by excess addition of CS. The drying process promoted coalescence of CS droplet particles to form a functional coating and to protect the core substance against influence of environmental conditions. The functional coating formed by the particles was characterized by scanning electron microscopy, wetting measurements, and atomic force microscopy and surface roughness. Atomic force microscopy and surface roughness analyses indicated that smooth surface with more hydrophobic groups on the surface of functional coating was obtained after CS addition and it was due to film forming ability of CS chains in the system. © 2014 Springer-Verlag Berlin Heidelberg. Source

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