Accelerating cure time / Mohamed Saad in ADHESIVES & SEALANTS INDUSTRY (ASI), Vol. 19, N° 6 (06/2012)  

[article]  inADHESIVES & SEALANTS INDUSTRY (ASI) > Vol. 19, N° 6 (06/2012) . - p. 34-36 Titre : Accelerating cure time : Cure time for thermically active adhesives can be accelerated by using infrated spot curing Type de document : texte imprimé Auteurs : Mohamed Saad, Auteur ; Elizabeth Brunet, Auteur Année de publication : 2012 Article en page(s) : p. 34-36 Langues : Américain (ame) Catégories : Adhésifs -- Séchage sous rayonnement infrarouge Adhésifs conducteurs Conducteurs organiques Epoxydes Microélectronique Polyimides Réticulation (polymérisation) Index. décimale : 668.3 Adhésifs et produits semblables En ligne : http://www.adhesivesmag.com/articles/91088-accelerating-cure-time Format de la ressource électronique : Web Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=19028 [article]

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Co-molded, metallic components for thermal barrier protection in RTM composite valves for internal combustion engines in SAMPE JOURNAL, Vol. 48, N° 3 (05-06/2012)  

[article]  inSAMPE JOURNAL > Vol. 48, N° 3 (05-06/2012) . - p. 17-20 Titre : Co-molded, metallic components for thermal barrier protection in RTM composite valves for internal combustion engines Type de document : texte imprimé Année de publication : 2012 Article en page(s) : p. 17-20 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Automobiles -- Moteurs -- Pièces Composites à fibres de carbone Matières plastiques dans les automobiles Moulage par transfert de résine sous vide Polyimides Protection thermique Index. décimale : 668.4 Plastiques, vinyles Résumé : In previous work, composite intake valves for use in internal combustion (IC) engines were manufactured by resin transfer molding (RTM) and demonstrated in a fully functional IC engine on a dynamometer. These valves consisted of a high temperature polyimide matrix, LaRC PETIRFI and PETI-RTM, reinforced with a carbon fiber preform. While this previous work successfully demonstrated the potential for composite intake valves, several issues were noted including limited temperature resistance in the engine combustion chamber. Thermal barrier coatings were considered, but it was hypothesized that co-molded metallic components would both improve the temperature resistance and the durability of the composite valves. In the current work, pre-machined, net-shape metallic caps are added to the composite valve, covering the valve face and seat areas. These caps are placed in the die cavity at the same time as the fiber preform, prior to the transfer of the matrix polymer. In addition to protecting the face of the valve from the temperature of the impinging combustion gases, the continuous metallic cap also provides a heat transfer path to the engine valve seat. Caps of varying geometry were co-molded and studied. The results of this study suggest that a strong fit is generated from the geometry of the cap/composite interface, but that residual stress build-up can be significant enough to distort the metal cap. Mechanical testing of the valve head stiffness indicates that a measureable improvement may be associated with the metallic cap. Further, fired engine testing confirms the potential of this modification, suggesting that continued investigation into fiber preform optimization to reduce the effects of residual stress generation at the metal-composite interface could yield a durable lightweight alternative valve. Note de contenu : - VALVE SPECIMEN PREPARATION : Metallic valve face - Metallic valve tip - MECHANICAL TESTING - FIRED ENGINE TESTING - PROCESS-INDUCED RESIDUAL STRESSES - MECHANICAL TESTING - FIRE ENGINE TESTING - DURABILITY EVALUATION - EVALUATION OF MASS CHANGE WITH RUN-TIME En ligne : http://www.fiberforge.com/documents/Auto_TiconaCFRTPSAMPEJournalMayJune_AM_0512_ [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=15605 [article]

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Coating properties of 1H,1H-perfluorooctylamine-terminated polyimides based on hexafluoroisopropylidene diphthalic anhydride and 1,4,5,8 naphthalenetetracarboxylic dianhydride / Mustafa Cakir in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 16, N° 3 (05/2019)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 16, N° 3 (05/2019) . - p. 699-710 Titre : Coating properties of 1H,1H-perfluorooctylamine-terminated polyimides based on hexafluoroisopropylidene diphthalic anhydride and 1,4,5,8 naphthalenetetracarboxylic dianhydride Type de document : texte imprimé Auteurs : Mustafa Cakir, Auteur ; Emre Akin, Auteur ; Recep Artir, Auteur Année de publication : 2019 Article en page(s) : p. 699-710 Note générale : Bibliogr. Langues : Américain (ame) Catégories : 1,4,5,8-dianhydride de naphtalène tétracarboxylique Composés organiques Essai de dureté Essais de résilience Essais dynamiques Hydrophobie Polyimides Résistance à l'abrasion Revêtements organiques Stabilité thermique Index. décimale : 667.9 Revêtements et enduits Résumé : This study attempted to prepare polyimide coatings (PIs) containing 6FDA (hexafluoroisopropylidene diphthalic anhydride) and/or NTDA (1,4,5,8 naphthalenetetracarboxylic dianhydride) in various ratios. 1% of these polyimide chains were terminated with 1H,1H-perfluorooctylamine (PFOA) and PFOA, and terminated polyimide coatings (PIFs) were prepared in the same ratios as PIs. Coatings were produced on aluminum substrates by a 75-μm wire-wound applicator and thermally imidized. Finally, thermal, wear, and physical properties of PIFs and PIs were compared to each other. PIFs exhibited higher abrasion resistance than PIs due to the presence of PFOA. The increase in 6FDA content also resulted in elevated abrasion resistance. Both NTDA and 6FDA compounds improved thermal stability. The increase in NTDA content raised the Tg values of the polyimides. PIFs exhibited higher static water contact angle values than PIs, but the existence of microcracks decreased their hydrophobicity. The gloss values of PIFs were excellent. Improved values were obtained for pencil hardness, crosscut adhesion, and MEK (methyl ethyl ketone) rubbing properties for all coatings. In addition to the pencil hardness test, a pendulum hardness test was also carried out. The presence of PFOA affected pendulum hardness values positively, and the increase in the amount of 6FDA on polymer backbone improved the pendulum hardness values despite the rigidity of NTDA. Note de contenu : - Materials - Synthesis of polyimides coatings - Measurements DOI : 10.1007/s11998-018-0147-3 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-018-0147-3.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=32583 [article]

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Coatings participate in the superconducting realm in COATINGS TECH, Vol. 17, N° 2 (02/2020)  

[article]  inCOATINGS TECH > Vol. 17, N° 2 (02/2020) . - p. 24-25 Titre : Coatings participate in the superconducting realm Type de document : texte imprimé Année de publication : 2020 Article en page(s) : p. 24-25 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Isolants électriques Polyimides Revêtements organiques Supraconducteurs organiques Index. décimale : 667.9 Revêtements et enduits Résumé : The ability of materials to conduct electricity is affected by temperature. When the temperature approaches absolute zero (–273°C), many materials—from metals to ceramics to carbon nanotubes—conduct electricity with no resistance, thus becoming superconductors. In these materials, electrons pair up and travel effortlessly, avoiding interactions with single electrons and other obstacles in circuits. Superconductors are attractive because they can be used to generate large magnetic fields, and superconducting magnets find use in everything from magnetic resonance imaging (MRI) machines to the detectors in supercolliders. The key challenge to their widespread use is the need to maintain the temperature at approximately –173°C (100 Kelvin) or lower, depending on the material. If a room-temperature superconductor could be identified, levitating trains and hoverboards could be possible. For many superconducting applications, coatings play a vital role. Electrically insulating coatings have been commonly used on superconducting wires. Newer insulating coatings, such as the ultra-thin polyimide coatings developed by scientists at the RIKEN Center for Life Science Technologies and Chiba University,1 can be as thin as 4 mm. This is more than 10 times thinner than the conventional insulation used for high-temperature superconducting wires. Wires with the new coating have a cross-section containing just 10% insulation, a fivefold reduction of conventional superconducting wires, and they exhibit double the magnetic strength. Reducing the ratio of insulation to conductor in the wire allows for more compact superconducting coils for use in next-generation medical and scientific devices. En ligne : https://drive.google.com/file/d/1_lWKY0D8eMNF5Q1to960CqSjjLnm9oC6/view?usp=share [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=33602 [article]

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Effects of surface pretreatment and deposition conditions on the gas permeation properties and flexibility of Al2O3 films on polymer substrates by atomic layer deposition / Dung-Yue Su in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 16, N° 6 (11/2019)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 16, N° 6 (11/2019) . - p. 1751-1756 Titre : Effects of surface pretreatment and deposition conditions on the gas permeation properties and flexibility of Al2O3 films on polymer substrates by atomic layer deposition Type de document : texte imprimé Auteurs : Dung-Yue Su, Auteur ; Yueh-Hua Kuo, Auteur ; Ming-Hung Tseng, Auteur ; Feng-Yu Tsai, Auteur Année de publication : 2019 Article en page(s) : p. 1751-1756 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Alumine Electronique Matériaux -- Propriétés barrières Polyéthylène téréphtalate Polyimides Revêtements protecteurs Traîtements de surface Tags : 'Dépôt  de  couche  atomique'  'Barrière  diffusion'  'Modification  surface'  'Electronique  organique'  'Substrats  flexibles' Index. décimale : 667.9 Revêtements et enduits Résumé : The effects of surface pretreatment and deposition conditions on the gas permeation properties—including permeability of He, O2, and H2O; the size; and the density of permeation-enhancing defects—and mechanical flexibility of Al2O3 films on polymer substrates by atomic layer deposition (ALD) were investigated to develop flexible gas barrier films for organic and flexible electronics. Pretreating polyimide (PI) and poly(ethylene terephthalate) (PET) substrates with an aqueous KOH solution greatly lowered the gas permeability of the ALD Al2O3 films as a result of improved affinity between the substrate surface and the ALD precursors. Varying the ALD conditions—including lengthening the precursor exposure, elevating the deposition temperature, and changing the precursor sequence—enhanced physisorption of ALD precursors on the polymer substrate, which improved nucleation of the ALD films to reduce defects in the films and lower their gas permeability. Activation energy for permeation determined from the temperature dependence of the permeability of the ALD films indicated that the ALD films deposited under the optimized condition contained smaller and few permeation-enhancing defects. The optimized ALD films possessed a low water vapor transmission rate of ~ 10−6 g/m2 day that met the stringent requirement of organic and flexible electronics, while also exhibiting excellent mechanical flexibility by withstanding repeated bending with small increases in gas permeability. Our results provide valuable insights into the development of flexible barrier thin films for the encapsulation of organic and flexible electronics. DOI : 10.1007/s11998-019-00238-x En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-019-00238-x.pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=33428 [article]

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Efficient separation in KUNSTSTOFFE INTERNATIONAL, Vol. 102, N° 7 (07/2012)

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Electronique imprimée et "smart composites" / Mathieu Schwander in PLASTIQUES & CAOUTCHOUCS MAGAZINE, N° 959 (09/2019)  

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Epoxy/glass and polyimide (LaRC TM PETI-8)/carbon fiber metal laminates made by the VARTM process / Roberto J. Cano in SAMPE JOURNAL, Vol. 47, N° 2 (03-04/2011)

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Exploration on energy-saved dyeing method for polyimide fabrics with alkali treatment / Xiru Shao in COLORATION TECHNOLOGY, Vol. 140, N° 4 (08/2024)  

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Face-sheet analysis ant thermo-physical property characterization of OOA and autoclave panels / S. G. Miller in SAMPE JOURNAL, Vol. 48, N° 5 (09-10/2012)

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Facile synthesis of atomic oxygen-resistant methyl silicone rubber-coated Kapton film for photovoltaic solar array blanket in low Earth orbit / Yi Li in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 20, N° 2 (03/2023)  

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From inception to insertion : successful products and applications using nickel nanostrands / Nathan Hansen in SAMPE JOURNAL, Vol. 47, N° 3 (05-06/2011)

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High temperature RTM370 polyimide composites fabricated by RTM : characterization and impact testing / K. C. Chuang in SAMPE JOURNAL, Vol. 49, N° 5 (09-10/2013)

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High temperature VARTM of phenylethynyl terminated imide (PETI) resins / Sayata Ghose in SAMPE JOURNAL, Vol. 47, N° 2 (03-04/2011)  

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Improving the dyeability of polyimide by pretreatment with alkali / Zehong Wang in COLORATION TECHNOLOGY, Vol. 132, N° 6 (12/2016)  

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Interaction of N-methylformanilide with high-performance polyimide fibre and its effect on dyeing / Dongyan Shao in COLORATION TECHNOLOGY, Vol. 138, N° 4 (08/2022)  

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Investigation of microstructure and air permeability of aerogel-coated textile fabric materials / A. Fonner in INTERNATIONAL POLYMER PROCESSING, Vol. 36, N° 3 (2021)  

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Metallization of polyimide materials for usage in aerospace / Toty Onggar in TECHNICAL TEXTILES, Vol. 65, N° 5 (12/2022)  

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Metallization of polyimide materials for usage in aerospace / Toty Onggar in MAN-MADE FIBERS INTERNATIONAL, Vol. 73, N° 1 (2023)  

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Metallization of polyimide materials for usage in aerospace / Toty Onggar in MAN-MADE FIBERS INTERNATIONAL, Vol. 73 - Year Book 2023 (2023)  

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