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Evaluation of thermo-mechanical and wear behavior of short carbon fibre vinyl-ester filled homogenous and their functionally graded composites / B. Gangil in INTERNATIONAL POLYMER PROCESSING, Vol. XXVIII, N° 2 (05/2013)
[article]
Titre : Evaluation of thermo-mechanical and wear behavior of short carbon fibre vinyl-ester filled homogenous and their functionally graded composites Type de document : texte imprimé Auteurs : B. Gangil ; Amar Patnaik ; A. Kumar Année de publication : 2013 Article en page(s) : p. 207-220 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Analyse mécanique dynamique
Composites à fibres -- Détérioration
Composites à fibres -- Propriétés thermomécaniques
Composites à fibres courtes
Composites à fibres de carbone
Esters de polyvinyle
Usure (mécanique)Index. décimale : 668.9 Polymères Résumé : The paper presents the processing and mechanical characterization of chopped carbon fibre reinforced homogenous and functionally graded vinyl ester composites and also reports on their sliding wear characteristics respectively. The sliding wear characteristics are studied with the help of POD test employing the design of experiments approach based on Taguchi’s orthogonal arrays. Dynamic mechanical analysis is carried out of the investigated homogenous/FGMs composites to investigate the overall stiffness/flexibility, so as to improve the specific wear rate. Present study reveals that graded composite possess good mechanical and wear characteristics compared to homogenous composites. SEM confirms the graded dispersion of carbon fibre in the matrix. Note de contenu : - EXPERIMENTAL DETAIL : Preparation of the specimens - Dry sliding wear test apparatus - Dynamic mechanical analysis - Experiment design
- RESULTS AND DISCUSSION : Effect of fibre loading on void fraction of the composites - Effect of fibre loading on hardness of the composites - Effect of fibre loading on tensile strength of the composites - Effect of fibre loading on flexural strength of the composites - Effect of fibre loading on impact energy of the composites - Dynamic mechanical analysis of homogeneous and graded composites - Taguchi experimental design analysis for homogeneous and graded composites - Worn surface morphology of homogeneous and graded composites - ANOVA and effects of factors on specific wear rate of the composites - Confirmation experiment for homogeneous and graded compositesDOI : 10.3139/217.2682 En ligne : https://drive.google.com/file/d/1WgB039PEzRKziTi7Hhym9IwTKuVMgrT4/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=18434
in INTERNATIONAL POLYMER PROCESSING > Vol. XXVIII, N° 2 (05/2013) . - p. 207-220[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 15050 - Périodique Bibliothèque principale Documentaires Disponible Fabrication and characterization of regenerated leather using chrome shavings as raw materials / Cuicui Ding in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXII, N° 5 (05/2017)
[article]
Titre : Fabrication and characterization of regenerated leather using chrome shavings as raw materials Type de document : texte imprimé Auteurs : Cuicui Ding, Auteur ; Min Zhang, Auteur ; Libo Dai, Auteur ; Yingying Qi, Auteur ; Ronghui Shi, Auteur ; Junhui Yang, Auteur Année de publication : 2017 Article en page(s) : p. 145-152 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Analyse mécanique dynamique
Analyse thermique
Cuir reconstitué
Microscopie électronique à balayage
Polymères en émulsion
Polyuréthanes
Pressage à chaud
ThermogravimétrieIndex. décimale : 675 Technologie du cuir et de la fourrure Résumé : Regenerated leather billet (semi-finished product) was prepared via hot pressing with chrome shaving and environment-friendly polymer waterborne polyurethanes (WPU) as the materials. The influence of WPU/chrome shaving ratios (w/w) on the performance of the billet was investigated by mechanical property test, dynamic thermal mechanical analysis, thermogravimetric analysis, differential scanning calorimetry and field-emission scanning electron microscopy. Furthermore, the ability of heat storage and temperature regulation was endowed for the regenerated leather by the addition of paraffin microcapsules. The results showed that a strong interface interaction could be achieved for the regenerated leather billet, which could be due to the formation of hydrogen bonds and the entanglement between WPU and leather shavings. In this way, WPU/leather shaving composites with favorable mechanical properties, thermal stability, ability of heat storage and temperature regulation were obtained. Note de contenu : - MATERIALS AND METHODS : Materials - Sample preparation - Mechanical properties tests of regenerated leathers - Dynamic mechanical analysis (DMA) - Thermogravimetric analysis (TGA) - Field-emission scanning electron microscopy (FESEM) - Differential scanning calorimetry (DSC) - Dynamic thermal mechanical properties of regenerated leathers - Thermogravimetricc analysis of regenerated leathers - Morphology of regenerated leathers - DSC thermograms of regenerated leathers En ligne : https://drive.google.com/file/d/11sHls5bq_Vn7T2GYgPB0sR1XXAgRmOI6/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=28550
in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CXII, N° 5 (05/2017) . - p. 145-152[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 18894 - Périodique Bibliothèque principale Documentaires Disponible Finding hidden structures / Kamakski Christopher in EUROPEAN COATINGS JOURNAL (ECJ), N° 3 (03/2017)
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Titre : Finding hidden structures : Methods of determining emulsion particle morphology reviewed Type de document : texte imprimé Auteurs : Kamakski Christopher, Auteur Année de publication : 2017 Article en page(s) : p. 84-88 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Analyse mécanique dynamique
Analyse spectrale
Analyse thermique
Caractérisation
Core-Shell
Emulsions
Microscopie
Morphologie (matériaux)
Polyacrylates
Polyuréthanes
Résonance magnétique nucléaire
Revêtements en phase aqueuse -- Additifs:Peinture en phase aqueuse -- AdditifsIndex. décimale : 667.9 Revêtements et enduits Résumé : The use of emulsions with heterogeneous polymer particles can greatly enhance water-borne coating performance. Techniques range from incorporating inorganic nanoparticles to combining similar polymers. The use of various characterisation methods for systematic analysis of structure and composition is described. Note de contenu : - Summary of methods for studying morphology
- The scope of differential scanning calorimetry
- Distinguishing polymers with similar characteristics
- DMA can also indentify hidden structures
- The value and limitations of TEM
- Other forms of microscopy
- Spectroscopy methods analyse only outer layers
- Solid state NMR analysis
- Logical analysis procedure is necessary
- FIGURES : 1. Schematic representation of different morphology structure (a) gradient (b) raspberry (c) sandwich (de) inclusion (e) core-shell - 2. Idealised states of phase separation within emulsion particles and examples of their corresponding derivative modulated DSC traces - DMA traces showing the difference in tan delta of single phase and core-shell polymer - 4. TEM micrographs of the emulsions particles (a) core-shell, (b) inclusion (c) multi-lobed - 5. SEM micrographs of (a) raspberry type, (b) film hybrid emulsion, (c) hollow polymer - 6. AFM image showing topography of (a) acrylate core-shell emulsion, (b & c) acrylate core/polyurethane shell - 7. Schematic diagram for arriving at the characterisation techniques most useful for morphology identificationEn ligne : https://drive.google.com/file/d/1zmIVnpSYeq8_a7YVhLDs1vB1AOjPOah-/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=27952
in EUROPEAN COATINGS JOURNAL (ECJ) > N° 3 (03/2017) . - p. 84-88[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 18717 - Périodique Bibliothèque principale Documentaires Disponible Functional powder coatings via isocyanate-cured phenolics and benzoxazines / Weih Lee in COATINGS TECH, Vol. 17, N° 7 (07/2020)
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Titre : Functional powder coatings via isocyanate-cured phenolics and benzoxazines Type de document : texte imprimé Auteurs : Weih Lee, Auteur ; Robert Polance, Auteur ; Hart Haugen, Auteur Année de publication : 2020 Article en page(s) : p. 16-23 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Analyse mécanique dynamique
Benzoxazine
Calorimétrie
Formulation (Génie chimique)
Isocyanates
Phénols
Polyuréthanes
Revêtements anti-graffitis
Revêtements poudre
RhéologieIndex. décimale : 667.9 Revêtements et enduits Résumé : In this work centering around phenolic chemistry, we investigated isocyanate and benzoxazine-modified phenolic powder coatings for use in anti-graffiti applications and for addressing downhole drill pipe interior coating challenges. Allied polyurethane formulations were developed using phenolic hydroxyl-isocyanate reactions and shown to outperform conventional aliphatic polyol-isocyanate coatings for graffiti-resistant applications. Effects of variables like phenol hydroxyl equivalent weights and molecular weights of phenolic resins were examined. In a separate effort intended for oil and gas downhole pipe interior lining applications, novel fusion-bonded benzoxazine-epoxy-phenolic formulations, without or with an acid catalyst, exhibited excellent adhesion, toughness, and process-ability, in addition to greatly reducing cure requirements as compared to benzoxazine self-polymerization. Applicable rheology and kinetics of cure were quantified, revealing characteristic flow and cure behaviors to strengthen the understanding of structure-property relationships and to facilitate efficient optimization of coating performance. Note de contenu : - MATERIALS AND METHODS : Dynamic mechanical analysis and differential scanning calorimetry - Physycal testing
- RESULTS AND DISCUSSION : Phenolic PU - Fusion bonded benzoxazines
- Fig. 1 : Chemical structure of BPA-derived phenolic resins
- Fig. 2 : Simplified benzoxazine self-crosslinking
- Fig. 3 : Chemical structure and basic properties of BOX80
- Fig. 4 : Di-functional BPA phenolic resins and internally blocked IPDI dimers were reacted to yield a thermosetting PU
- Fig. 5 : Taber abrasion weight losses
- Fig. 6 : Rheological DMA profiles for UO-D8
- Fig. 7 : DSC exothermic curves and kinetic data
- Fig. 8 : Rheological DMA profiles for BOX80 self-crosslinking
- Table 1 : Formulation matrix and physical properties
- Table 2 : Complete kinetics and cure schedulesEn ligne : https://drive.google.com/file/d/17EjEnXJZc80tkHpeRfLrIV1RFYHJmg9j/view?usp=share [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=34341
in COATINGS TECH > Vol. 17, N° 7 (07/2020) . - p. 16-23[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 21873 - Périodique Bibliothèque principale Documentaires Disponible
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Titre : Getting back into shape : Polyisocyanate selection strongly affects recovery from scratch damage Type de document : texte imprimé Auteurs : Olaf Fleck, Auteur ; Stephan Nowak, Auteur ; Ulrich Meier-Westhues, Auteur Année de publication : 2009 Article en page(s) : p. 106-111 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Analyse mécanique dynamique
Effet mémoire de forme
Liaisons hydrogène
Polyisocyanates
Polymères aliphatiques
Polymères autoréparants
Polyuréthanes
Résistance à l'abrasion
Revêtements:PeintureIndex. décimale : 667.9 Revêtements et enduits Résumé : Polyisocyanates not only crosslink polymers, but also influence their resistance to damage. Studies of the recovery behaviour of aliphatic polyurethane systems after scratching provide the basis for an energy-specific recovery index. This indicates the self-healing capacity of polyurethane systems, which is related to the polymer shape-memory effect. Note de contenu : - Hydrogen bonds enhance scratch resistance
- Dynamic mechanical analysis evaluates hydrogen bonds
- Three isocyanates studied in two coating chemistries
- Highest functionality isocyanate gives best reflow
- Steric hindrance is significant for recovery indexEn ligne : https://drive.google.com/file/d/1mLLkf5dd-6bLTjfNmybssFPHa8knjbky/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=24162
in EUROPEAN COATINGS JOURNAL (ECJ) > N° 4/2009 (04/2009) . - p. 106-111[article]Réservation
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