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Thermal insulation revolution in buildings between past and present : an updated review / Mohammed Belghazdis in MATERIAUX & TECHNIQUES, Vol. 112, N° 1 (2024)  

[article]  inMATERIAUX & TECHNIQUES > Vol. 112, N° 1 (2024) . - 14 p. Titre : Thermal insulation revolution in buildings between past and present : an updated review Type de document : texte imprimé Auteurs : Mohammed Belghazdis, Auteur ; Mohammed El Khalfaouy, Auteur ; Ek-Kaber Hachem, Auteur Année de publication : 2024 Article en page(s) : 14 p. Note générale : Bibliogr. Catégories : Aérogels Construction -- Matériaux Constructions -- Isolation Isolation thermique Polystyrène Index. décimale : 693.8 Constructions à l'épreuve du feu, isolation, insonorisation, résistance aux agents nuisibles, aux ébranlements, à la foudre, étanchéité et résistance à l'humidité Résumé : Eco-design, sustainability and energy efficiency are emerging concepts that reflect the need to design new building solutions that are environmentally friendly and reduce material and energy consumption. Indeed, the probability of a massive climate change, capable of threatening the planet’s stability, is high if the current trend continues. The purpose of this study is to elucidate the main thermal insulation materials dominating the current market as well as their origins, strengths, and weaknesses. Additionally, the study identifies the criteria that make an insulator ideal and may be competitive in the near future as well as the direction of research in order to develop advanced materials. The results of the consulted studies reveal that there is no agreement on an ideal insulator that gather all the thermal insulation requirements. Each of the categories has its own weaknesses that should be addressed in the future to overcome. As well, super-insulators remain one of the most promising materials in this market, but they require more research in order to overcome some of the weaknesses that limit their insertion and production on a large scale. Ecological materials produced from natural fibers are currently far from being the candidates that can compete with super-insulators. Thus, considerable efforts are required to make these natural fibers able to dominate the construction market. Similarly, the comparison of the thermal conductivity of the four categories confirms that super-insulators are the most effective in reducing heat transfer through walls and through thinner layers as well. Finally, in addition to the ecological aspect, the thermo-physical and mechanical properties, and so on, the insulating materials must guarantee certain percentages of acoustic insulation. Note de contenu : - THERMAL INSULATION MATERIALS : - Inorganic materials - Organic materials - Super-insulation materials - Eco-friendly insulation materials - Table 1 : Range of thermal conductivity of inorganic insulators - Table 2 : Range of thermal conductivity variation for each organic insulator - Table 3 : Range of thermal conductivity of super-insulating materials - Table 4 : Range of thermal conductivity of eco-friendly insulation materials - Table 5 : Range of variation of some thermocphysical properties of the four categories of insulator DOI : https://doi.org/10.1051/mattech/2024006 En ligne : https://www.mattech-journal.org/articles/mattech/pdf/2024/01/mt20230045.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=41030 [article]

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Rheological, mechanical, and morphological behaviour of polypropylene composites reinforced with ultrafine kaolinite particles / Ouahiba Meziane in MATERIAUX & TECHNIQUES, Vol. 112, N° 1 (2024)  

[article]  inMATERIAUX & TECHNIQUES > Vol. 112, N° 1 (2024) . - 11 p. Titre : Rheological, mechanical, and morphological behaviour of polypropylene composites reinforced with ultrafine kaolinite particles Type de document : texte imprimé Auteurs : Ouahiba Meziane, Auteur ; Abderrahim Bensedira, Auteur ; Melia Guessoum, Auteur Année de publication : 2024 Article en page(s) : 11 p. Note générale : Bibliogr. Catégories : Charges (matériaux) Composites -- Propriétés mécaniques Kaolin Morphologie (matériaux) Polypropylène Rhéologie Index. décimale : 668.4 Plastiques, vinyles Résumé : To develop charge/matrix interactions and improve the rheological, mechanical, and morphological performances of the matrix polypropylene, PP/kaolinite composites were prepared using the melt intercalation method at 190 °C. The rheological and mechanical properties of polypropylene/kaolin composites have been evaluated at various concentrations of untreated and/or treated kaolin. It was shown that the melt flow index (MFI) varies visibly but slightly compared to that of the matrix with increasing kaolin content. Furthermore, when the kaolin loading is enhanced, the apparent shear viscosity (ηapp) of the composites increases compared to the matrix and decreases with the increase in the shear rate (γapp). Also, while the shear stress (Ï„app) is reduced, the flow curve shifts upwards with increasing the kaolin concentration. The systems obeyed the power-law model in shear stress-shear rate variations and were shear thinning as power-law index (n) values increased with kaolin content. Moreover, the mechanical properties of the obtained composites were significantly affected by the dispersion of the filler into the matrix and by the weak interactions at the interface PP/kaolinite. SEM micrographs show a poor dispersion of the nanoclay within the polypropylene matrix and the formation of agglomerates with different sizes. Note de contenu : - EXPERIMENTAL : Materials - Kaolinite treatment - Preparation of composites - Characterization techniques - RESULTS AND DISCUSSION : Structural analysis of treated and untreated kaolinite - Characterization of PP/kaolin composites DOI : https://doi.org/10.1051/mattech/2024012 En ligne : https://www.mattech-journal.org/articles/mattech/pdf/2024/01/mt20230191.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=41031 [article]

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Matériaux & Techniques Vol. 112, N° 1 URL