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Synthesis of biological based anionic fatliquor and its application on leather / Muhammad Kashif Pervez in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CX, N° 10 (10/2015)
[article]
Titre : Synthesis of biological based anionic fatliquor and its application on leather Type de document : texte imprimé Auteurs : Muhammad Kashif Pervez, Auteur ; F. Ahmed, Auteur ; Sarwat Jahan Mahboob, Auteur ; Rajkumar Dewani, Auteur ; H. R. Nawaz, Auteur ; M. Zeeshan, Auteur ; T. Ayaz, Auteur Année de publication : 2015 Article en page(s) : p. 326-331 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Absorption
Cuirs et peaux -- Propriétés physiques
Huile de colza
Huile de ricin et constituants
Huiles et graisses végétales
Mélange
Produits de nourriture du cuirIndex. décimale : 675 Technologie du cuir et de la fourrure Résumé : In this study, three types of anionic fat liquors are prepared from various vegetable oils by sulfation process. One fatliquor is made from pure canola oil, the second one from castor oil and the third one is made from a mixture of different oils, which is termed here as ‘Blended oil’. Canola oil is used for fat-liquoring purpose and has been compared with other natural oil based fat-liquors and a commercially available sulfated fat-liquor. Different chemical and physical studies were carried out to find out the fat-liquor producing the best results. Chemical studies of fat-liquor such as pH, fat content, solid content, moisture and organically combined sulfuric anhydride were determined before its application on leather. The physical studies such as tear strength, tensile strength, elongation, burst load, softness and distention were carried out on crust leather. The fat content test was carried out to check the uptake of fat-liquors by leather samples. On the basis of chemical and physical analysis the blended oil based fat liquor was found to be better than the castor & canola oil based fatliquors and commercially available sulfated fat-liquor. Note de contenu : - EXPERIMENTAL : Sulfatation - Fat-liquoring - Chemical testing of fat-liquor - Physical testing of fat-liquored leather
- RESULTS AND DISCUSSION : Chemical analysis of fat-liquor - Physical analysis of fat-liquored leatherEn ligne : https://drive.google.com/file/d/16lDrYiVmdK5WSJl7GZjD_uoDFcqQPP4H/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=24743
in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CX, N° 10 (10/2015) . - p. 326-331[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 17500 - Périodique Bibliothèque principale Documentaires Disponible
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Titre : The art of processing resin : Dosing-mixing systems including vacuum degassing for pultrusion Type de document : texte imprimé Auteurs : Michael Stöcker, Auteur Année de publication : 2022 Article en page(s) : p. 38-39 Langues : Anglais (eng) Catégories : Composites à fibres de carbone
Composites à fibres de verre
Dégazage
Epoxydes
Matières plastiques -- Appareils et matériel
Mélange
Polyuréthanes
Pultrusion
Systèmes de dosageIndex. décimale : 668.4 Plastiques, vinyles Résumé : Pultrusion is a highly attractive solution for synthetic resin processing. It is regarded as the standard technology for the automated production of lightweight but highly resilient profiles and molded parts made of GRP and CFRP. The provision of a high-quality resin matrix for the continuous impregnation of fiber reinforcements is a decisive process stage here. The dosing, mixing and application systems from Tartler are specially matched to this process step. Note de contenu : - First degas, then mix
- Mixing system as offline central station or inline module
- Fig. 1 : One of the first processing stages of pultrusion: introduction of the fiber reinforcement into an impregnation tank or profile mold filled with liquid synthetic resin
- Fig. 2 : The GRP/CFRP knit is impregnated with a matrix of liquid polyurethane (PU) or epoxy resin and various additives
- Fig. 3 : The result of pultrusion is a lightweight but highly resilient profile and molded part made of GRP or CFRP
- Fig. 4 : The Nodopur synthetic resin processing system: with automatically controlled mixing ratios and outputs of 0.1 to 100 l/min, it meters and mixes one or more components with viscosities from 1.0 to 60,000 mPasEn ligne : https://drive.google.com/file/d/1Wv0U8_fkHXX2xaTPMsOtDIWTJsaB5JkW/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=37208
in KUNSTSTOFFE INTERNATIONAL > Vol. 112, N° 1 (2022) . - p. 38-39[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 23221 - Périodique Bibliothèque principale Documentaires Disponible The effect of cellulose nanocrystals (CNC) on isothermal crystallization kinetics of LLDPE and HDPE / V. Tan in INTERNATIONAL POLYMER PROCESSING, Vol. XXXIII, N° 3 (07/2018)
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Titre : The effect of cellulose nanocrystals (CNC) on isothermal crystallization kinetics of LLDPE and HDPE Type de document : texte imprimé Auteurs : V. Tan, Auteur ; W. Abdallah, Auteur ; Musa R. Kamal Année de publication : 2018 Article en page(s) : p. 371-380 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Calorimétrie
CelluloseLa cellulose est un glucide constitué d'une chaîne linéaire de molécules de D-Glucose (entre 200 et 14 000) et principal constituant des végétaux et en particulier de la paroi de leurs cellules.
Cristallisation
Mélange
Nanoparticules
Nucléation
Polyéthylène basse densité linéaire
Polyéthylène haute densitéIndex. décimale : 668.4 Plastiques, vinyles Résumé : Highly porous agglomerates of spray freeze dried cellulose nanocrystals (SFD-CNC) were prepared, starting with sonicated aqueous suspensions of spray-dried cellulose nanocrystals powder (SD-CNC). Subsequently, SFD-CNC together with the SD-CNC (used as a reference) were incorporated into LLDPE and HDPE via melt compounding in a batch mixer to produce nanocomposites containing 0.5 wt.° and 2 wt.° CNC. Differential scanning calorimetry (DSC) was used to study the thermal properties and the isothermal crystallization kinetics of the polyethylenes and the nanocomposites. Polarized light microscopy (PLM) was used to evaluate the growth kinetics and spherulitic structure of polyethylene in both the filled and unfilled polymers. Avrami crystallization kinetics models were employed to analyze the DSC results. It was observed that CNC acts as a heterogeneous nucleating agent in LLDPE nanocomposites, thus yielding nucleation controlled crystallization. On the other hand, in the HDPE systems (polymer and nanocomposites) heterogeneous nucleation was followed by 3-D growth. It was observed that CNC slightly hindered the formation of chain folding for the HDPE, similar to previous studies on the polypropylene and its nanocomposites. Spray freeze drying produced twice as many nucleation sites compared to spray dried samples and it enhanced the overall crystallization rate and the crystallinity. Note de contenu : - EXPERIMENTAL : Materials - Preparation of spray-freeze-dried cellulose nanocrystals - Preparation of PE nanocomposites - Characterization of PE nanocomposites
- RESULTS AND DISCUSSION : Polarized light microscopy - Differential scanning calorimetry
- CONCLUSIONS : PLM microstructure morphology - Comparison of particle size and clusters from PLM - DSC calorimetric thermal properties - DSC isothermal crystallizationDOI : 10.3139/217.3559 En ligne : https://drive.google.com/file/d/14k4oivGUXLQ5gw9nk8tItGzZsnXKBYPL/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=30806
in INTERNATIONAL POLYMER PROCESSING > Vol. XXXIII, N° 3 (07/2018) . - p. 371-380[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 20044 - Périodique Bibliothèque principale Documentaires Disponible The influence of melt-mixing conditions and state of dispersion on crystallisation, rheology and mechanical properties of PCL/sepiolite nanocomposites / M. Eriksson in INTERNATIONAL POLYMER PROCESSING, Vol. XXXV, N° 3 (07/2020)
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Titre : The influence of melt-mixing conditions and state of dispersion on crystallisation, rheology and mechanical properties of PCL/sepiolite nanocomposites Type de document : texte imprimé Auteurs : M. Eriksson, Auteur ; M. Meuwissen, Auteur ; Ton Peijs, Auteur ; H. Goossens, Auteur Année de publication : 2020 Article en page(s) : p. 302-313 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Argile
Caractérisation
Charges (matériaux)
Composites -- Propriétés mécaniques
Cristallisation
Dispersions et suspensions
Etat fondu (matériaux)
Matériaux hybrides -- Propriétés mécaniques
Mélange
Morphologie (matériaux)
Nanoparticules
Poly-e-caprolactone
Rhéologie
SépioliteLa sépiolite est un minéral du groupe des argiles à structure fibreuse. Le nom de ce minéral dérive d'un terme grec ancien, francisé en sépion et qui désigne l'os de seiche.
Chaque fibre est formée d'une multitude de tunnels (ou canalicules) d'environ 1 nm^2 régulièrement espacés (voir "Structure cristalline"). Cette configuration particulière en briques creuses allongées, propre à son arrangement cristallin, lui confère une surface spécifique très importante: 394 m^2/g.
Suivant les carrières dont elle est extraite, on note la présence de fer, d'aluminium voire de nickel et même de manganèse dans la structure cristalline de la sépiolite.
Structure cristalline : La formule générale retenue dans la littérature est Mg4 Si6 O15 (OH)2 · 6(H2O).
La structure est en doubles feuillets de type mica, mais la polarité de chaque feuillet s’inverse tous les 6 tétraèdres, formant ainsi une structure 3D de doubles rubans anastomosés créant les canalicules décrits ci-dessus.
Elle appartient au groupe d'espace Pnan, avec comme paramètre de maille : a = 13.43 Ã…, b = 26.88 Ã…, c = 5.281 Ã….Index. décimale : 668.4 Plastiques, vinyles Résumé : It is generally accepted that the benefit of anisotropic nanofiller addition is strongly dependent on the state of the dispersion of these fillers in a polymer matrix. In this paper the influence of melt-compounding conditions on the dispersion of a needle-like clay, i. e. sepiolite, in poly(∊-caprolactone) (PCL) is investigated. The crystallisation behavior as well as the rheological and mechanical properties of PCL/sepiolite nanocomposites with filler contents up to 5 wt.% are studied. By changing the screw speed during melt-mixing in a micro-compounder, the state of dispersion was varied, with the higher speed leading to better dispersion and breakdown of the sepiolite agglomerates or bundles. Rheometry showed that better dispersed nanocomposites displayed an increase in viscosity due to network formation at slightly higher filler loadings. Likewise, better dispersed composites showed a modest increase in crystallisation temperature at low filler content, accompanied by a decrease in both nucleation efficiency and degree of crystallisation at higher loadings. Better dispersed nanocomposite systems also showed superior mechanical properties, particularly at higher filler loadings. However, overall the reinforcing efficiency of sepiolite in all nanocomposites was relatively low. This was mainly a consequence of the relatively low filler aspect ratio and the simultaneous breakup of sepiolite needles together with a breakdown of bundles during compounding. Note de contenu : - EXPERIMENTAL METHODS : Materials - Sample preparation - Characterisation techniques
- RESULTS AND DISCUSSION : Morphology of nanocomposites - Rheological behavior - Crystallisation behavior - Mechanical propertiesDOI : https://doi.org/10.3139/217.3890 En ligne : https://drive.google.com/file/d/1C_PoBRUAR8AK71yz3RRYp8Apgx65kZFp/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=34495
in INTERNATIONAL POLYMER PROCESSING > Vol. XXXV, N° 3 (07/2020) . - p. 302-313[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 21818 - Périodique Bibliothèque principale Documentaires Disponible The processing behavior of liquid Sn/molten polyethylene during internal mixing / G. Zhang in INTERNATIONAL POLYMER PROCESSING, Vol. XXIX, N° 2 (05/2014)
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Titre : The processing behavior of liquid Sn/molten polyethylene during internal mixing Type de document : texte imprimé Auteurs : G. Zhang, Auteur ; T. Liu, Auteur ; X. Liu, Auteur ; Y. Yi, Auteur ; L. Liu, Auteur ; X. Tan, Auteur ; J. Luo, Auteur ; J. He, Auteur ; H. Ma, Auteur ; A. Lu, Auteur ; Z. Deng, Auteur ; Y. Shu, Auteur Année de publication : 2014 Article en page(s) : p. 175-183 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Composites
Etain
Etat fondu (matériaux)
Interfaces (Sciences physiques)
Mélange
Polyéthylène haute densité
Taille des particulesIndex. décimale : 668.9 Polymères Résumé : In our study, liquid tin (Sn) was mixed with molten polyethylene using an internal mixer; the interfacial tension between the liquid Sn and molten polyethylene was measured using the deformed drop retraction method. The results showed that liquid Sn separated when the Sn content was higher than approximately 2?% by volume because of the interfacial tension of up to 167?mN/m and the 106-fold viscosity difference between the liquid Sn and the molten polyethylene. When Sn separation did not occur, the effects of the mixing time and rotary speed on the degree of mixing and the Sn particle size were analyzed using thermogravimetric analysis and scanning electron microscopy. The results showed that the effects of mixing time and rotary speed on the degree of mixing and Sn particle size can be combined as the impact of specific energy input. With increasing specific energy input, the degree of mixing initially increased and subsequently remained constant, while the Sn particle size initially decreased and subsequently remained constant. The refinement of the dispersed phase was completed with a low specific energy input, but the homogenization of the dispersed phase required a higher specific energy input to achieve completion, revealing the relationship between distributive mixing and dispersive mixing. Note de contenu : - EXPERIMENTS : Raw materials - Internal mixing of Sn and HDPE - Determination of the interfacial between liquid Sn and molten HDPE - Evaluation of the homogeneity of the composites - Morphologies and sizes of the metal phase in the composites
- RESULTS AND DISCUSSION : Aggregation and separation of liquid Sn - Relationship of the degree of mixing and Sn particle size with processing conditionsDOI : 10.3139/217.2635 En ligne : https://drive.google.com/file/d/1-PqBCAezE0A2WzEL0_iHa1HCJ8s1wO2q/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=21309
in INTERNATIONAL POLYMER PROCESSING > Vol. XXIX, N° 2 (05/2014) . - p. 175-183[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 16222 - Périodique Bibliothèque principale Documentaires Disponible The turn of the screw / Michael Dillon in POLYMERS PAINT COLOUR JOURNAL - PPCJ, Vol. 192, N° 4450 (03/2002)
PermalinkPermalinkThree-dimensional numerical study of the mixing behaviour of twin-screw elements / F. Ilinca in INTERNATIONAL POLYMER PROCESSING, Vol. XXVII, N° 1 (03/2012)
PermalinkThree levers for controlling product quality / Markus Schmied in KUNSTSTOFFE INTERNATIONAL, Vol. 103, N° 6 (06/2013)
PermalinkTwo tales of coatings : myth and reality of powder coatings with silver metallics / Arun K. Chattopadhyay in PAINTINDIA, Vol. LXIII, N° 4 (04/2013)
PermalinkValorisation of tannery waste and animal by-product for acoustics applications / Tesfay Gebryergs in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXVI, N° 6 (06/2021)
PermalinkValorization of glass powder waste, crushed and dune sands in the mix design of ultra-high performance fiber reinforced concrete : assessing effect of waste variability / Mourad Belkadi in MATERIAUX & TECHNIQUES, Vol. 109, N° 1 (2021)
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