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High cleanability paints based on pigment adsorbing acrylic binders / Anne Koller in POLYMERS PAINT COLOUR JOURNAL - PPCJ, Vol. 203, N° 4586 (07/2013)
[article]
Titre : High cleanability paints based on pigment adsorbing acrylic binders Type de document : texte imprimé Auteurs : Anne Koller, Auteur Année de publication : 2013 Article en page(s) : p. 20-22 Langues : Anglais (eng) Catégories : Absorbants et adsorbants
Encapsulation
Liants
Microscopie électronique à balayage
Polyacryliques
Résistance à la salissure
Résistance aux taches
Revêtements organiques
Revêtements:PeintureIndex. décimale : 667.2 Colorants et pigments Résumé : Polymer-pigment composites deliver enhanced hiding efficiency in many point systems and improve film barrier properties. Barrier properties such as stain resistance are due to better film structure because pigments are encapsulated with carefully engineered adsorbing polymers. Also there is less inorganic pigment sticking at the surface of the paint film resulting in a smoother point surface and improved dirt pick up resistance.
Engineered polymer particles, which permanently adsorb on to inorganic pigments in paints and in particular on to titanium dioxide, were recently developed. They allow the formation of polymer/pigment composite particles as represented in figure 1.
When used in a coating, these polymer/pigment composite particles are more homogeneously distributed than TiO2 in a conventional coating based on a non-adsorbing polymer. Such behaviour is shown in figure 2. The higher brightness of the white TiO2 particles in the conventional coating compared to the polymer/pigment composite coating proves that the conventional coating has more pigment particles protruding at the surface of the coating film than for the polymer/pigment composite coating. The better encapsulation of pigments by adsorbing polymer improves barrier properties as will be shown in the selected examples.Note de contenu : - Coating film formation based on polymer/pigment composite particles and barrier properties
- Stain resistance test method
- Table 1. Semi-gloss paints on soft pure acrylic binder and on soft pure acrylic adsorbing polymer A
- Table 2. Semi-gloss/matte paints based on high quality hard pure acrylic binder and on hard pure acrylic adsorbing polymer B
- Table 3. Masonry paints based on a pure acrylic binder and on soft adsorbing polymer AEn ligne : https://drive.google.com/file/d/12jeCMIpb48t9U3kx7-2xBRsa-LOaWs1K/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=19205
in POLYMERS PAINT COLOUR JOURNAL - PPCJ > Vol. 203, N° 4586 (07/2013) . - p. 20-22[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 15399 - Périodique Bibliothèque principale Documentaires Disponible Hydrophobization, smoothing, and barrier improvements of cellulose nanofibril films by sol–gel coatings / Jari Vartiainen in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 17, N° 1 (01/2020)
[article]
Titre : Hydrophobization, smoothing, and barrier improvements of cellulose nanofibril films by sol–gel coatings Type de document : texte imprimé Auteurs : Jari Vartiainen, Auteur ; Klaus Rose, Auteur ; Yukihiro Kusano, Auteur ; Juha Mannila, Auteur ; Lisa Wikström, Auteur Année de publication : 2020 Article en page(s) : p. 305-314 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Angle de contact
Brillance (optique)
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.
Copolymères
Couches minces
Hydrophobie
Matériaux -- Propriétés barrières
Matières plastiques -- Revêtement
Microscopie électronique à balayage
Nanofibres
Rugosité
Sol-gel, ProcédéIndex. décimale : 667.9 Revêtements et enduits Résumé : Single-layer films from cellulose nanofibrils on a plastic support were coated with sol–gel coated with inorganic–organic copolymers (ORMOCER®s), consisting of inorganic Si–O–Si-based networks combined with ceramic (Al–O– and Zr–O–) groups and special organic fluoroalkyl chain containing functional groups. Sol–gel coatings decreased the surface hydrophilicity and water vapor transmission rate. The water contact angle of uncoated films was 24°, indicating high affinity between water and the cellulose nanofibrils. All sol–gel coatings tested increased the surface hydrophobicity with the contact angles ranging between 54° and 102°. The water vapor transmission rates varied between 230 and 410 g/m2/day. With UV curable highly organically crosslinked coating, the water vapor transmission rate was decreased by 77% as compared to uncoated film. The uncoated film had oxygen transmission rates of 0.7 and 107 cc/m2/day at 50% and 80% RH, respectively. At high humidity conditions, the films tended to swell, thus allowing permeation to increase. Sol–gel coatings significantly improved the oxygen barrier properties especially at 80% RH. The transmission rates varied between 0.4 and 0.5 cc/m2/day (50% RH) and between 51 and 86 cc/m2/day (80% RH). Note de contenu : - Cellulose nanofibrils (CNF) and CNF films
- Sol-gel coatings
- Scanning electron microscopy (SEM)
- Roughness
- Gloss
- Contact angle measurements
- Oxygen permeation
- Water vapor permeationDOI : 10.1007/s11998-019-00292-5 En ligne : https://link.springer.com/content/pdf/10.1007/s11998-019-00292-5.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=33747
in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 17, N° 1 (01/2020) . - p. 305-314[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 21517 - Périodique Bibliothèque principale Documentaires Disponible Hydroxyapatite nanoparticles and polyethylene glycol treatment of historical leather : mechanical properties / Amir Ershad-Langroudi in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CVIII, N° 12 (12/2013)
[article]
Titre : Hydroxyapatite nanoparticles and polyethylene glycol treatment of historical leather : mechanical properties Type de document : texte imprimé Auteurs : Amir Ershad-Langroudi, Auteur ; Akram Mirmontahai, Auteur Année de publication : 2013 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Analyse thermomécanique dynamique
Cuirs et peaux -- Propriétés mécaniques
Essais accélérés (technologie)
Essais dynamiques
HydroxyapatiteL'hydroxyapatite est une espèce minérale de la famille des phosphates, de formule Ca5(PO4)3(OH), usuellement écrite Ca10(PO4)6(OH)2 pour souligner le fait que la maille de la structure cristalline comprend deux molécules. L'hydroxyapatite est le membre hydroxylé du groupe apatite. L'ion OH- peut être remplacé par le fluor, le chlore ou le carbonate.
L'hydroxyapatite cristallise dans le système hexagonal. La poudre d'hydroxyapatite pure est blanche. Celles que l'on trouve dans la nature peuvent cependant être de couleur marron, jaune ou verte.
Microscopie électronique à balayage
Microscopie électronique en transmission
Nanoparticules
Polyéthylène glycol
Traction (mécanique)Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : Historical leather objects are at risk of deterioration through mechanical stress such as viscoelastic and plastic deformation as well as natural aging erosion. So, it was expected that appropriate leather treatment should improve their mechanical properties. For this purpose, the mechanical behavior of goat historical leather treated with hydroxyapatite (HA) and polyethylene glycol 400 (PEG400) was studied and compared with the mechanical properties of untreated sample (control). The samples were subjected to a dynamic tensile stress by dynamic mechanical thermal analysis (DMTA) as well as static stress by tensile test. In addition, the treatment effects on the leather mechanical properties were investigated after accelerating aging test. It was shown that treated sample exhibited more softness, better mechanical properties and less structural changes than the untreated sample. The Scanning Electron Microscopy studies show uniform distribution of nanoparticles in the leather matrix as well as the nano hydroxyapatite particles, which are placed between collagen fibers. Note de contenu : - MATERIALS AND METHODS : Aging procedure
- CHARACTERIZATION : Tensile test - Dynamic mechanical thermal analysis (DMTA) - Scanning electron microscopy (SEM-EDX) study - Transition electron microscopy (TEM) study
- RESULTS AND DISCUSSION : Tensile strength test - Dynamical mechanical thermal analysis (DMTA) - SEM - EDX - TEMEn ligne : https://drive.google.com/file/d/1HS0UnJDyZ404M7OROEhdGZIf-XzjOWM5/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=20058
in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CVIII, N° 12 (12/2013)[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 15840 - Périodique Bibliothèque principale Documentaires Disponible Identification of gram-positive haloversatile bacteria in soak liquor samples and observation of their damage to sheepskin by scanning electron microscopy / Ozlem Ozbay in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 106, N° 6 (11-12/2022)
[article]
Titre : Identification of gram-positive haloversatile bacteria in soak liquor samples and observation of their damage to sheepskin by scanning electron microscopy Type de document : texte imprimé Auteurs : Ozlem Ozbay, Auteur ; Pinar Caglayan, Auteur Année de publication : 2022 Article en page(s) : p. 255-263 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Bactéries -- Identification
Bactéries haloversatiles
Bains de trempe -- Analyse
Cuirs et peaux -- Détérioration
Cuirs et peaux de moutons
EnzymesUne enzyme est une protéine dotée de propriétés catalytiques. Pratiquement toutes les biomolécules capables de catalyser des réactions chimiques dans les cellules sont des enzymes ; certaines biomolécules catalytiques sont cependant constituées d'ARN et sont donc distinctes des enzymes : ce sont les ribozymes.
Une enzyme agit en abaissant l'énergie d'activation d'une réaction chimique, ce qui accroît la vitesse de réaction. L'enzyme n'est pas modifiée au cours de la réaction. Les molécules initiales sont les substrats de l'enzyme, et les molécules formées à partir de ces substrats sont les produits de la réaction. Presque tous les processus métaboliques de la cellule ont besoin d'enzymes pour se dérouler à une vitesse suffisante pour maintenir la vie. Les enzymes catalysent plus de 5 000 réactions chimiques différentes2. L'ensemble des enzymes d'une cellule détermine les voies métaboliques qui peuvent avoir lieu dans cette cellule. L'étude des enzymes est appelée enzymologie.
Les enzymes permettent à des réactions de se produire des millions de fois plus vite qu'en leur absence. Un exemple extrême est l'orotidine-5'-phosphate décarboxylase, qui catalyse en quelques millisecondes une réaction qui prendrait, en son absence, plusieurs millions d'années3,4. Comme tous les catalyseurs, les enzymes ne sont pas modifiées au cours des réactions qu'elles catalysent, et ne modifient pas l'équilibre chimique entre substrats et produits. Les enzymes diffèrent en revanche de la plupart des autres types de catalyseurs par leur très grande spécificité. Cette spécificité découle de leur structure tridimensionnelle. De plus, l'activité d'une enzyme est modulée par diverses autres molécules : un inhibiteur enzymatique est une molécule qui ralentit l'activité d'une enzyme, tandis qu'un activateur de cette enzyme l'accélère ; de nombreux médicaments et poisons sont des inhibiteurs enzymatiques. Par ailleurs, l'activité d'une enzyme décroît rapidement en dehors de sa température et de son pH optimums.
Liqueurs de tannage
Microscopie électronique à balayageIndex. décimale : 675 Technologie du cuir et de la fourrure Résumé : In the leather industry, the salting process is applied to raw hides in order to prevent microbial activity. Salted hides and skins are then soaked to re-absorb the water lost during salting and also to clean the salted hides and skins. Due to the organic load, salt and faeces present in the soak liquor, the soak liquor provides a suitable environment for the growth of bacteria. Bacteria that develop on the hide/skin may cause significant damage to these hides and skins. Therefore, the aims of the present study were to examine the pH values and salt saturation of the soak liquor samples, to detect the total counts of haloversatile bacteria, total counts of proteolytic haloversatile bacteria and total counts of lipolytic haloversatile bacteria in the soak liquor samples.
Enzyme (amylase, caseinase, lipase, xylanase, cellulase, protease, DNase, pullulanase, urease, oxidase, or catalase) producing haloversatile bacteria were also isolated from these samples and they were identified with 16S rRNA gene sequence analysis. Their metabolic activities such as utilisation of different amino acid and carbon sources were tested. In addition, the damage caused to the skin structure by enzyme-producing haloversatile bacteria were examined using scanning electron microscope. The pH values and salt saturation of the samples were found as 8.80-9.30 and 3.5%- 5.5%, respectively.
The total counts of haloversatile bacteria, proteolytic, and lipolytic haloversatile bacteria were respectively detected as 3.8 x 104-1.6 x 106CFU/mL, 1.2 x 104-5.8 x 105CFU/mL, and 6.3 x 104-4.6 x 105CFU/mL. Six haloversatile bacteria were isolated from the samples belonging to five different species such as Terribacillus halophilus, Brevibacterium luteolum, Bacillus australimaris, Bacillus siamensis, and Bacillus mojavensis. Various enzymes such as protease (83%), lipase (83%), caseinase (67%), amylase (50%), cellulase (17%) were produced by the isolates, on the other hand, none were xylanase, DNase, pullulanase and urease positive.
Different sugar sources [lactose (100%), D-(+)-dextrose (100%), myo-inositol (100%), D-(+)- cellobiose (100%), adonitol (100%), D-(-)-salicin (100%), dulcitol (100%), D-mannose (100%), xylitol (83%), L-(+)-arabinose (83%), D-mannitol (67%), D-(-)-fructose (67%), D-(+)-trehalose (67%), D-(-)- ribose (50%), D-(+)-melezitose (33%) and sucrose (17%)] and different amino acid sources [L-serine (100%), L-glutamic acid (67%), DL-phenylalanine (67%), trans-4-hydroxy-L-proline (67%), L-proline (67%), glycine (50%), L-ornithine (50%), L-aspartic acid (33%), L- phenylalanine (33%), L-arginine (17%), L-histidine (17%), L-lysine (17%), L-threonine (17%)] were utilised by the isolates. D-sorbitol, D-(+)-galactose, maltose, D-(+)-xylose and D-(+)-melibiose, L-isoleucine, L-cystine, L-alanine, leucine, L-methionine, L-tyrosine and L-valine were not used.Note de contenu : - EXPERIMENTAL PROCEDURES : Soak liquor samples - Determination of temperature, pH and salinity values - Determination of total counts of haloversatile
- DETERMINATION OF TOTAL COUNTS OF PROTEOLYTIC AND LIPOLYTIC HALOVERSATILE BACTERIA : Isolation of haloversatile bacteria - Determination of enzymatic activities of haloversatile bacteria - Utilisation of different amino acids and different sugars by haloversatile bacteria - 16S rRNA Sequences of DNA belonging to the haloversatile isolates - Nucleotide accession number - Examining the effects of pH, salt and temperature on haloversatile bacterial growth - Investigation of cell morphology an dpigmentation of haloversatile bacteria - Sheepskin curing process and storage - Preparation of sheepskin samples for examination under scanning electron microscopeEn ligne : https://drive.google.com/file/d/1pv1NXv_AA0sblUQelr9lGmsalSpOCx7c/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=38518
in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 106, N° 6 (11-12/2022) . - p. 255-263[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 23756 - Périodique Bibliothèque principale Documentaires Disponible Improvement in the scratch resistance of polymers by roller burnishing process / K. O. Low in INTERNATIONAL POLYMER PROCESSING, Vol. XXV, N° 3 (07/2010)
[article]
Titre : Improvement in the scratch resistance of polymers by roller burnishing process Type de document : texte imprimé Auteurs : K. O. Low, Auteur ; N. S. M. El-Tayeb, Auteur ; P. V. Brevern, Auteur Année de publication : 2010 Article en page(s) : p. 176-180 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Microscopie électronique à balayage
Polissage
Polyoxyméthylène
Polyuréthanes
Résistance à l'abrasionIndex. décimale : 668.9 Polymères Résumé : The ability of engineering polymers to resist scratching action has rapidly become a vital requirement for diverse industrial applications because scratches may greatly reduce the life cycle of the components. Therefore, the present work aims to study the possibility of using roller burnishing process to enhance the scratch resistance of polymers to a single pass scratching action. The effects of burnishing feed rate and roller contact width on the scratch hardness of poly(oxymethylene) and polyurethane were considered. The results revealed that low burnishing feed rate and smaller roller contact width led to an increase in scratch hardness for both polymers. The scratch fractures were also observed using SEM to study the changes in wear modes. DOI : 10.3139/217.2144 En ligne : https://drive.google.com/file/d/1pYT5-Tids2uIueLfJbPvxKy_ow6kvjAt/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=9711
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