Optimisation du comportement mécanique de composites structuraux PEKK/Fibres de carbone par ensimage oligomères de PEKK

L'objectif de cette recherche est la conception et l'analyse d'un ensimage pour composites structuraux PEKK/Fibres de carbone (FC) continues. Les oligomères de PEKK (oPEKK) ont été synthétisés en laboratoire pour définir les caractéristiques physico-chimiques permettant leur utilisation comme agent d'ensimage. A partir de ce cahier des charges, un oligomère " pilote " a pu être synthétisé afin de mener des études sur la formulation de l'ensimage. A partir d'une étude quantitative de relation structure-propriété (QSPR) et des réseaux de neurone artificiels (ANN), le développement et l'optimisation d'une formulation d'ensimage " solvantfree " ont été réalisés Le dépôt de cet ensimage a été effectué selon deux protocoles : nous avons ainsi réalisé un " ensimage laboratoire " et " ensimage sur pilote ". Les performances mécaniques des composites PEKK/FC ensimés oPEKK ont été étudiées par analyse mécanique dynamique (AMD) ; quel que soit le protocole, l'ensimage optimise les performances mécaniques de manière significative. Il est intéressant de souligner que l'" ensimage sur pilote " est plus efficace que l'" ensimage laboratoire ". Outre, l'intérêt de l'ensimage au niveau de la mise en œuvre des composites, le transfert de contraintes fibre/ matrice est optimisé ce qui se traduit par une augmentation des modules mécaniques conservatif et dissipatif.The objective of this research is to design and analyze a sizing for PEKK / continuous carbon fiber (CF) structural composites. PEKK oligomers (oPEKK) were synthesized in the laboratory to define the physicochemical characteristics allowing their use as a sizing agent. From these specifications, a "pilot" oligomer was synthesized in order to carry out studies on the sizing formulation. From a study of quantitative structure-property relationship (QSPR) and artificial neural networks (ANN), the development and optimization of a "solvent-free" sizing formulation was performed. The deposit of this sizing was achieved according to two protocols: we thus produced a "laboratory sizing" and "pilot sizing". Mechanical performances of PEKK / CF without and with oPEKK sizing composites were studied by dynamic mechanical analysis (DMA). Whatever the protocol is, the sizing optimizes the mechanical performances significantly. It is interesting to note that "pilot sizing" is more efficient than "laboratory sizing". Besides the advantage of sizing for fiber placement in composite processing, the fiber / matrix stress transfer is optimized. Then, it results in an increase of both storage and loss modulus

MUSINT 2

Musint 2 is a text to be read, accompanying the new MUSINT II website, following and innovating the general features of the previous MUSINT. But, as the two on-line projects differ in both technical aspects and content while maintaining similar principles and purposes, so the new volume takes on a role that makes it a novelty more suited to the progress that characterises the archaeological disciplines under a scientific and didactic perspective. The division into three sections is still maintained. The first section contains a series of works directly related to the MUSINT II site. There is an increase in the number of presentations relating to technical and educational aspects, which are considered an innovation of the new site, compared with scientific contributions intended in a more traditional sense. The second section presents an array of significant works of virtual musealisation, specifically chosen from the most varied areas, and tries to underline their educational approach. The third section is developed in continuity with the previous edition, although it presents new features in the choice of the selected research works: in fact, it selects topics which were already proposed in their experimental phase, as well as new research that have been identified over the years through the wider knowledge on the possibilities of a digital and interactive museology