Jointly conducted analysis and structural test evaluation for automotive B-pillar parts / Daeryeong Bae in JEC COMPOSITES MAGAZINE, N° 142 (09-10/2021)  

[article]  inJEC COMPOSITES MAGAZINE > N° 142 (09-10/2021) Titre : Jointly conducted analysis and structural test evaluation for automotive B-pillar parts Type de document : texte imprimé Auteurs : Daeryeong Bae, Auteur ; Shangho Mun, Auteur ; Hyun-young Lee, Auteur ; Joonhyeok Choi, Auteur Année de publication : 2021 Langues : Anglais (eng) Catégories : Composites à fibres -- Moulage par compression Composites à fibres de carbone Essais (technologie) Evaluation Fibres à orientation unidirectionnelle Matériaux -- Imprégnation Matières plastiques dans les automobiles Simulation par ordinateur Index. décimale : 668.4 Plastiques, vinyles Résumé : The main goal of this task is to develop automotive B-pillar parts reinforced with carbon fibre reinforced plastic (CFRP) by establishing CAE analysis techniques through correlation between prepreg compression moulding/structural performance (static load) simulation and actual experimental results. Note de contenu : - Lightweight B-pillar design - B-pillar CFRP reinforcement part manufacturing process - Validation of formed part - Structural analysis considering fibre orientation - B-pillar static test for single component - Fig. 1 : Overall workflow and participants for forming-structural coupled simulation - Fig. 2 : Overall structure of automotive B-pillar and comparison of conventional metal B-pillar and lightweight aluminium B-pillar with CFRP reinforcement - Fig. 3 : Thermosetting epoxy carbon fibres UD prepreg compression moulding process procedure - Fig. 4 : a) The modelled forming process configuration (optimised blank shape and positioning of tools in AniForm) and b) Comparison of the composite forming prediction with the experimental result of the formed B-pillar part - Fig. 5 : FE-model of B-pillar reinforcement with fibre orientations for structural analysis - Fig. 6 : Boundary and loading conditions for top and bototm side of B-pillar En ligne : https://drive.google.com/file/d/1clgmUodKgQt82FSqCwM9plig2VkYr-pL/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=37173 [article]

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Novel azo dyes derived from phthalimide. Part 2 / Jae-Hong Choi in COLORATION TECHNOLOGY, Vol. 124, N° 6 (2008)  

[article]  inCOLORATION TECHNOLOGY > Vol. 124, N° 6 (2008) . - p. 364-369 Titre : Novel azo dyes derived from phthalimide. Part 2 : Dyeing properties and colour fastness on polyester fibres Type de document : texte imprimé Auteurs : Jae-Hong Choi, Auteur ; Jong-yun Choi, Auteur ; Hyun-young Lee, Auteur ; Andrew D. Towns, Auteur ; Chun Yoon, Auteur Année de publication : 2009 Article en page(s) : p. 364-369 Note générale : Bibliogr. Langues : Anglais (eng) Index. décimale : 667.3 Teinture et impression des tissus Résumé : The coloration and fastness properties of 18 carbocyclic monoazo disperse dyes bearing a phthalimide ring fused to the aromatic ring of their diazo components have been investigated. In each case, the phthalimidyl nitrogen atom was substituted with either a butyl, sec-butyl or isopropyl group, while the adjoined phenyl ring bore a substitution pattern typical of commercial colorants. Dye uptake and build-up onto both conventional and microfibre polyester through exhaustion dyeing were examined: while the expected tendency of greater exhaustion on microfibre was noted, there were few clear trends with respect to dye structure. The nature of the N-alkyl group made no consistent difference to dye uptake. Attempts to explain the observed percentage exhaustion values by mapping them to calculated partition coefficient or solubility parameter values were unsuccessful. Wash fastness tended to be best for blue dicyano-substituted derivatives, which may be as a result in part of these substituents promoting hydrolysis of the adjacent phthalimide ring to give more soluble phthalate species. In contrast, the dicyano dyes had relatively poor photostability compared with their unsubstituted analogues. DOI : 10.1111/j.1478-4408.2008.00164.x En ligne : http://onlinelibrary.wiley.com/doi/10.1111/j.1478-4408.2008.00164.x/pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=3245 [article]

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Preparation of thermally stable dyes derived from diketopyrrolopyrrole pigment by polymerisation with polyisocyanate binder / Chun Yoon in COLORATION TECHNOLOGY, Vol. 131, N° 1 (02/2015)  

[article]  inCOLORATION TECHNOLOGY > Vol. 131, N° 1 (02/2015) . - p. 2-8 Titre : Preparation of thermally stable dyes derived from diketopyrrolopyrrole pigment by polymerisation with polyisocyanate binder Type de document : texte imprimé Auteurs : Chun Yoon, Auteur ; Hye-Sun Kwon, Auteur ; Jae-Sung Yoo, Auteur ; Hyun-young Lee, Auteur ; Ji-Hye Bae, Auteur ; Jae-Hong Choi, Auteur Année de publication : 2015 Article en page(s) : p. 2-8 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Caractérisation Colorants -- Solubilité Colorants -- Synthèse Pigments organiques Polyisocyanates Résines photosensibles Stabilité thermique Teinture -- Fibres textiles Index. décimale : 667.3 Teinture et impression des tissus Résumé : Four thermally stable and solvent soluble dyes were prepared from diketopyrrolopyrrole pigment via an N-alkylation reaction. To improve the thermal stability of the dyes, a hydroxyl functional group that could react with blocked polyisocyanates was introduced into the dyes. The prepared dyes had absorption maxima near 500 nm, and the chromaticity diagrams of all synthesised dyes exhibited smaller x and y values than those of CI Pigment Red 254, indicating that the colour of the synthesised dyes was close to an orange shade. The dyes reacting with blocked polyisocyanates showed extremely high thermal stability compared with analogous dyes not reacting with polyisocyanates. Note de contenu : - EXPERIMENTAL : Materials and instrumentation - Synthesis of dyes - Preparation of a colour filter photoresist - Preparation of a colour filter photoresist without polyisocyanates - Preparation of a colour filter photoresist with polyisocyanates - Preparation of glass sheets - Solubility investigation - Measurement of spectral and chromatic properties - Thermal stability measurement - RESULTS AND DISCUSSION : Dye synthesis - Dye solubility - Characterisation of spectral properties - Chromatic properties of spin-coated colour filters - Characterisation of the thermal stability of dyes DOI : 10.1111/cote.12119 En ligne : https://onlinelibrary.wiley.com/doi/epdf/10.1111/cote.12119 Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=22967 [article]

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Synthesis and spectroscopic properties of novel azo dyes derived from phthalimide / Jae-Hong Choi in COLORATION TECHNOLOGY, Vol. 123, N° 6 (2007)  

[article]  inCOLORATION TECHNOLOGY > Vol. 123, N° 6 (2007) . - p. 379-386 Titre : Synthesis and spectroscopic properties of novel azo dyes derived from phthalimide Type de document : texte imprimé Auteurs : Jae-Hong Choi, Auteur ; Joon-Soo Park, Auteur ; Mi-Hyeon Kim, Auteur ; Hyun-young Lee, Auteur ; Andrew D. Towns, Auteur Année de publication : 2008 Article en page(s) : p. 379-386 Note générale : Bibliogr. Langues : Anglais (eng) Index. décimale : 667.3 Teinture et impression des tissus Résumé : A set of azo dyes has been synthesised using N-substituted phthalimides as diazo components. 3,5-Dibromo-N-substituted-phthalimidylazo derivatives were cyanated by cyanodehalogenation to give dicyano analogues. All of the synthesised intermediates and dyes have been characterised by mass spectrometry, 1H-NMR or elemental analyses. The gamut of colour of the prepared dyes spanned much of the visible spectrum: absorption maxima of the dyes in formamide were observed in the range 436 to 609 nm. Consistent with results seen in previous studies of non-phthalimido monoazo disperse dyes, replacement of dibromo groups with dicyano functions in the phthalimide-based set led to large bathochromic shifts in absorption maxima, as did the introduction of acetylamino groups onto the coupler ring ortho to the azo link. However, switching an N-propyl function on the imido ring for a benzyl or 3-cyanopropyl substituent had little effect on absorption maxima. Good correlations between the observed absorption maxima of certain dyes and those of model analogues predicted by Pariser–Parr–Pople molecular orbital calculations were observed when steric effects were absent. DOI : 10.1111/j.1478-4408.2007.00112.x En ligne : http://onlinelibrary.wiley.com/doi/10.1111/j.1478-4408.2007.00112.x/pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=6858 [article]

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Synthesis and spectroscopic properties of novel phthalimide-derived monoazo disperse dyes containing ester groups / Jae-Hong Choi in COLORATION TECHNOLOGY, Vol. 126, N° 4 (2010)  

[article]  inCOLORATION TECHNOLOGY > Vol. 126, N° 4 (2010) . - p. 237-242 Titre : Synthesis and spectroscopic properties of novel phthalimide-derived monoazo disperse dyes containing ester groups Type de document : texte imprimé Auteurs : Jae-Hong Choi, Auteur ; Oh-tak Kwon, Auteur ; Hyun-young Lee, Auteur ; Andrew D. Towns, Auteur ; Chun Yoon, Auteur Année de publication : 2010 Article en page(s) : p. 237-242 Note générale : Bibliogr. Langues : Anglais (eng) Index. décimale : 667.3 Teinture et impression des tissus Résumé : The synthesis and spectroscopic properties of monoazo dye series, whose members consist of N-alkylphthalimide diazo components combined with a coupling component containing two ester groups, are reported. Such colourants are potentially alkali-clearable as a consequence not only of the presence of diester functionality on the coupler, but also through use of the base-sensitive phthalimide system. Shortening the N-alkyl group by removing one or two methylene units from a butyl chain made little difference to absorption properties, as would be expected given the relatively minor differences in inductive character produced. Shifts in the absorption maximum of the dyes associated with dibromination of the phthalimidylazo motif and its subsequent cyanodehalogenation were in agreement with theory and literature data for related series. Diester substitution on the coupling component brought about hypsochromism and hypochromism. Note de contenu : EXPERIMENTALS : Materials - Analyisis and spectroscopy - Preparation of intermediates and dyes - Synthesis of phthalimide intermediates - Synthesis of diester coupling component - Synthesis of dyes. RESULTS AND DISCUSSION : Synthesis of dye intermediates and dyes - Spectroscopic properties. DOI : 10.1111/j.1478-4408.2010.00252.x En ligne : http://onlinelibrary.wiley.com/doi/10.1111/j.1478-4408.2010.00252.x/pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=9876 [article]

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Synthesis of quenchers to control the fluorescence of Rhodamine B and improve the contrast ratio of blue filters for LCDs / Hyun-young Lee in COLORATION TECHNOLOGY, Vol. 132, N° 4 (08/2016)  

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