École nationale supérieure de chimie de Lille

About: École nationale supérieure de chimie de Lille is a facility organization based out in Villeneuve-d'Ascq, France. It is known for research contribution in the topics: Catalysis & Intumescent. The organization has 464 authors who have published 634 publications receiving 21882 citations. The organization is also known as: Ecole nationale supérieure de chimie de Lille & Ecole nationale superieure de chimie de Lille.

Recent Advances for Intumescent Polymers

Abstract: Summary: This paper reviews recent approaches for making intumescent systems The mechanisms of action involving intumescence are described and commented on Synergistic aspects using zeolites and organoclays are also considered and discussed New strategies are examined on the basis of the mechanism of intumescence The approach of using char forming polymers as additives (blend technology) is also fully discussed This consists of substituting classical polyols (char forming agents) with char forming polymers (polyamides and thermoplastic polyurethane) It will be shown that the advantages of this concept are to obtain flame-retarded (FR) polymer blends with improved mechanical properties in comparison with polymers loaded with classical formulations, and the avoidance of problems due to the water solubility of the polyols and their migration The “nanocomposite approach” enhances the performance of intumescent systems by using a nanostructured char forming polymer It will be shown that this combination of intumescence via the blending approach and nanocomposites enhances both flame retardancy and mechanical properties, and allows many specifications to be produced (for example, the design of EVA-based materials for flame retarded low voltage cables and wire) This appears to be one of the most promising ways for designing new efficient intumescent materials Intumescent residue after LOI test of an intumescent poly(propylene)

Fire retardant polymers : recent developments and opportunities

Abstract: In this Feature Article, we discuss recent developments of flame retardant polymers. Three approaches are considered: (i) inherently flame retardant polymers, (ii) chemically modified polymers and (iii) flame retardants as additives for polymers. We have tried to show the new directions and concepts emerging in the field of flame retardancy. We have mainly focused our comments on flame retardants, nanofillers and surface treatment because very promising concepts appeared recently in the published literature. Synergistic aspects are also fully discussed.

Recent Material Developments in Fast Oxide Ion Conductors

Abstract: Over the past decade, many efforts have been made to develop new materials exhibiting high oxide ion mobility at low temperature. In addition to the improvements of existing materials, new classes of conductors in which the structure have been shown to play an important role has been proposed. These materials are reviewed according to their structure type. Their performances and limitations are presented and discussed.

Ab initio study of foreign interstitial atom (C, N) interactions with intrinsic point defects in α -Fe

Abstract: The behavior of carbon and nitrogen atoms in iron based solid solution is studied by ab initio density-functional-theory calculations. The interaction of a C or a N atom in $\ensuremath{\alpha}$-Fe with a vacancy, other C or N interstitials as well as self-interstitial atoms is discussed and compared to known experimental results. The migration of these two foreign interstitial atoms is determined in pure Fe or when a vacancy is present in the supercell. According to our results, there is a strong binding energy of C or N with vacancies, whereas a repulsion is observed with self-interstitial atoms. Furthermore, a vacancy can trap up to two C, and a covalent bonding forms between the two C atoms. The situation is not as clear for N atoms, and a competition between the formation of N-V pairs and NN-V triplets is very probable.