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Chemical analysis of painted thermoplastics by thermal degradation GC/MS / W. R. Rodgers in JOURNAL OF COATINGS TECHNOLOGY (JCT), Vol. 66, N° 837 (10/1994)
[article]
Titre : Chemical analysis of painted thermoplastics by thermal degradation GC/MS Type de document : texte imprimé Auteurs : W. R. Rodgers, Auteur ; T. S. Ellis, Auteur ; G. D. Cheever, Auteur ; R. Louis-Ferdinand, Auteur ; D. P. Thorton, Auteur ; N. Somers, Auteur Année de publication : 1994 Article en page(s) : p. 27-33 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Automobiles -- Revêtements:Automobiles -- Peinture
Caoutchouc styrène-butadiène
Chimie analytique
Chromatographie en phase gazeuse
Couches minces
Oxyde de polyphénylène
Polyamide 66
Polycarbonates
Polypropylène
PyrolyseLa pyrolyse est la décomposition ou thermolyse d'un composé organique par la chaleur pour obtenir d'autres produits (gaz et matière) qu'il ne contenait pas. L'opération est réalisée en l'absence d'oxygène ou en atmosphère pauvre en oxygène pour éviter l'oxydation et la combustion (L’opération ne produit donc pas de flamme). Il s'agit du premier stade de transformation thermique après la déshydratation.
Elle permet généralement d'obtenir un solide carboné, une huile et un gaz. Elle débute à un niveau de température relativement bas (à partir de 200 °C) et se poursuit jusqu'à 1 000 °C environ. Selon la température, la proportion des trois composés résultants est différente.
Spectrométrie de masse
Terpolymère acrylonitrile butadiène styrène
ThermoplastiquesUne matière thermoplastique désigne une matière qui se ramollit (parfois on observe une fusion franche) d'une façon répétée lorsqu'elle est chauffée au-dessus d'une certaine température, mais qui, au-dessous, redevient dure. Une telle matière conservera donc toujours de manière réversible sa thermoplasticité initiale. Cette qualité rend le matériau thermoplastique potentiellement recyclable (après broyage). Cela implique que la matière ramollie ne soit pas thermiquement dégradée et que les contraintes mécaniques de cisaillement introduites par un procédé de mise en forme ne modifient pas la structure moléculaire.Index. décimale : 667.9 Revêtements et enduits Résumé : Paint finishes are an integral part of thermoplastic automotive applications. However, little is known about their chemical/physical behavior under reprocessing conditions or their effect on reprocessed thermoplastic. Paint film degradation on exposure to 290-300°C in a nonoxidizing atmosphere (simulating thermoplastic processing conditions) was characterized by thermal desorption-gas chromatography/mass spectrometry. Some important conclusions are: degradation of paint systems begins at about 260°C; thermal desorption (dynamic headspace)-gas chromatography/mass spectrometry is well-suited for studying this degradation; volatile emissions vary according to the paint system, its manufacturer, and the thermoplastic substrate; and some of the volatiles have the potential to degrade polymer substrates. Note de contenu : - EXPERIMENTAL : Thermal desorption-gas chromatography/mass spectrometry analyses (TD-GC/MS)
- RESULTS AND DISCUSSION : Paint films - Polymer substrates - Painted polymersPermalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=18719
in JOURNAL OF COATINGS TECHNOLOGY (JCT) > Vol. 66, N° 837 (10/1994) . - p. 27-33[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 003471 - Périodique Bibliothèque principale Documentaires Disponible 003484 - Périodique Bibliothèque principale Documentaires Exclu du prêt
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Titre : Cleaning the lungs : The processor paritec combines materials and functions in 2-component injection molding Type de document : texte imprimé Année de publication : 2018 Article en page(s) : p. 45-49 Langues : Anglais (eng) Catégories : Elastomères thermoplastiques
Matériel médical
Matières plastiques bi-composant
Polymères en médecine
Polypropylène
Respirateurs médicaux
Terpolymère acrylonitrile butadiène styrèneIndex. décimale : 668.4 Plastiques, vinyles Résumé : While it is not entirely common practice, just about everyone has inhaled before. In moder inhalation devices, sophisticated 2-component parts made of TPE and PP or ABS form the link between the sensitive face and a technical control unit. A look at the product development shows how materials and functionality are skillfully combined. Note de contenu : - Airway therapy with aerosol
- Stroke of genius with TPE
- A full repertoire of 2-component technologies
- Formulation and processing parameters crucial for adhesion
- Seal and button in one cycle
- Digitalization of SMEs
- Fig. 1 : The Velox mobile inhaler : to the left the junior version with an all-round soft silicone mask for infants and preemies, to the right the adult version. The nebulizr unit with the mixing chamber is behind the mouthpiece, and even further back is the control unit with the on/off
- Fig. 2 : This mouthpiece is commonly used for Pari devices. However, its techical development was unique, both for Paritec and for Kraiburg TPE
- Fig. 4. A look at the factory work floor, fully modernized in 2012. "In production, I want to have information locally and remotely to make decisions quickly". Koch says. "If I have to rely on the bush and corridor telegraph, we lose"
- Fig. 5. Exterior and interior view of the ABS upper shell of the Velox housing with control unit. TPE serves as the seal and button in one, and is distributed to the inside and outside via sophisticated flow paths from a singje injection pointEn ligne : https://drive.google.com/file/d/1WX9vgnp6qnKT7nnQUsuIQfLEU5zilc3M/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=30497
in KUNSTSTOFFE INTERNATIONAL > Vol. 108, N° 4 (04/2018) . - p. 45-49[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 19801 - Périodique Bibliothèque principale Documentaires Disponible Clever tool for short cooling / Claire Strasser in KUNSTSTOFFE INTERNATIONAL, Vol. 108, N° 9 (09/2018)
[article]
Titre : Clever tool for short cooling : Systematic approach to the selection of nucleating agents Type de document : texte imprimé Auteurs : Claire Strasser, Auteur Année de publication : 2018 Article en page(s) : p. 45-51 Langues : Anglais (eng) Catégories : Analyse thermique
Cristallisation
Matières plastiques -- Refroidissement
PolypropylèneIndex. décimale : 668.4 Plastiques, vinyles Résumé : The precise prediction of polypropylene’s crystallization behavior is of great economic importance. Not only do important processing parameters – such as mold temperature and time, and therefore productivity – depend on it, but so do the mechanical properties of the manufactured product. DSC measurements are helpful in precisely assessing the influence of different nucleating agents. Note de contenu : - Experiments for the crystallization behavior
- Dynamic measurements
- Isothermal crystallization measurements
- From DSC curves to predictions for process optimization
- Fig. 1 : Cooling (bottom) and second heating (top) of pure polypropylene : crystallization peak in the cooling segment at 110 °C and melting peak in the second heating segment at 162 °C
- Fig. 2 : DSC curves of pure PP and PP with different nucleating agents during cooling at 20 K/min : Pure polypropylene (green), polypropylene with NU-100 (yellow) and polypropylene with trisamide
- Fig. 3 : Isothermal crystallization of pure polypropylene at 128°C (dashed curve: temperature ; solid curve : DSC signal) ; The detail excerpt clearly illustrates the marked, broad exothermal crystallization peakthanks to modified scaling
- Fig. 4 : Isothermal crystallization of pure polypropylene at five temperatures between 124°C and 128°C (dashed : temperature, continuous : DSC signal)
- Fig. 5 : Avrami plot for the isothermal crystallization of pure polypropylene at different temperatures. Points are calculated for the conversion rates from 10 to 90 % of the total peak area
- Fig. 6 : Comparison of the measured and calculated crystallization behavior of pure PP: The simulation (lines) on the basis of a one-step reaction according to the Avrami equation is in good agreement with the DSC measuring points (correlation coefficient: 0.998)
- Fig. 7 : The two-step reaction model according to the Avrami equation and an nth order reaction leads to even better concordance (correlation coefficient : 0.999) between simulation (lines) and DSC measurement points (crystallization peaks) : a) pure PP, b) PP with trisamide and c) PP with NU-100
- Fig. 8 : Prediction of the crystallization behavior of the three samples at an isothermal tempera¬ture of 130 °C
- Table 1 : Results of the isothermal crystallization or pure polypropylene and PP with trisamide or NU-100
- Table 2 : Isothermal crystallization results
- Table 3 : Kinetic parameter of the isothermal crystallization or pure PP, PP+trisamide and PP+NU-100, according to a two-step reaction modelEn ligne : https://www.kunststoffe.de/en/_storage/asset/6989120/storage/master/file/3983293 [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=31175
in KUNSTSTOFFE INTERNATIONAL > Vol. 108, N° 9 (09/2018) . - p. 45-51[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 20202 - Périodique Bibliothèque principale Documentaires Disponible Cloverleaf-shaped bi-component fibers for diesel fuel filters / Arne Brockers in CHEMICAL FIBERS INTERNATIONAL, Vol. 67, N° 1 (03/2017)
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Titre : Cloverleaf-shaped bi-component fibers for diesel fuel filters Type de document : texte imprimé Auteurs : Arne Brockers, Auteur ; Inga Noll, Auteur ; Gunnar Seide, Auteur ; Thomas Gries, Auteur Année de publication : 2017 Article en page(s) : p. 32-33 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Extrusion filage
Fibres textiles bi-composant
Filtres à carburante filtre à carburant en général, mais aussi le filtre à essence pour les véhicules pourvus d'un moteur à explosion, permettent d'éliminer le maximum d'impuretés en suspension dans le carburant présent dans le réservoir ou la tuyauterie d'alimentation en carburant. De la qualité du carburant dépend les performances du véhicule, mais aussi sa longévité.
Polyamide 6
PolypropylèneIndex. décimale : 677.4 Textiles artificiels Résumé : The aim of this research project is the extrusion of cloverleaf-shaped bicomponent fibers with hydrophilic water-guiding channels which increase the efficiency of diesel fuel filters. These fibers should enable a water separation capability up to 95% from stable emulsions. Note de contenu : - TABLE : Test results of the fiber properties
- FIGURES : 1. Principle of water separation by the usage of cloverleaf-shaped bi-component fibers - 2. Geometry of the bi-component fiber with hydrophilic water conduction channels - 3. Microscopic image of the cross-section of the extruded bi-component fiberEn ligne : https://drive.google.com/file/d/1GXKFPK8HkYfLOS7EteFzHXoV2uDlxWFJ/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=28287
in CHEMICAL FIBERS INTERNATIONAL > Vol. 67, N° 1 (03/2017) . - p. 32-33[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 18815 - Périodique Bibliothèque principale Documentaires Disponible Co-intercalation in PP clay nanocomposites : effect of short chain additives on rheological properties / B. Haworth in INTERNATIONAL POLYMER PROCESSING, Vol. XXVI, N° 1 (03/2011)
[article]
Titre : Co-intercalation in PP clay nanocomposites : effect of short chain additives on rheological properties Type de document : texte imprimé Auteurs : B. Haworth, Auteur ; U. N. Ratnayake, Auteur Année de publication : 2011 Article en page(s) : p. 91-99 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Argile
Dispersions et suspensions
Ecoulement cisaillé
Matériaux hybrides
Montmorillonite
Polymères -- Additifs
PolypropylèneIndex. décimale : 668.9 Polymères Résumé : Layered structures in inorganic minerals are not easily intercalated when combined with conventional non-polar polymers such as polypropylene (PP). A new co-intercalation method is reported whereby the combined influence of low molecular weight polar additives and polyolefin-based compatibilizers on PP-clay nanocomposites (PPCN) has been investigated. Our research has shown that the interlayer spacing of montmorillonite clay increases dramatically, and increased particle dispersion is achieved, when short chain, organic additives (typically amidetype, AM) are included. In this work, the migration of these additives into the clay galleries has been confirmed by surface energy data (from contact angle experiments) and by various capillary flow measurement techniques. Shear flow data have been used to interpret the mechanism of intercalation, following compound preparation using melt-state mixing processes. At relatively low concentrations, the erucamide molecules assist the intercalation process in nanocomposites; however if an excess of AM is apparent within the bulk polymer melt, unusual flow behavior is observed which can be attributed to wall slip. Modified melt elasticity is also obtained with the PPCN’s leading to reduced die swell characteristics in extrusion processes. Significant differences in melt flow behavior can therefore be attributed to the presence of AM; a mechanism for co-intercalation has been proposed in terms of hydrogen bonding between the additives and the silicate layers. DOI : 10.3139/217.2409 En ligne : https://drive.google.com/file/d/18BmekobMvn91EwgaGdQg2f9tWakUkZcW/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=11068
in INTERNATIONAL POLYMER PROCESSING > Vol. XXVI, N° 1 (03/2011) . - p. 91-99[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 012871 - Périodique Bibliothèque principale Documentaires Disponible Coagent modified polypropylene prepared by reactive extrusion : a new look into the structure-property relations of injection molded parts / P. Tiwary in INTERNATIONAL POLYMER PROCESSING, Vol. XXXI, N° 4 (08/2016)
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