Effect of polysiloxane additives on the scratch resistance of an acrylic melamine automotive clearcoat / Bahram Ramezanzadeh in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 9, N° 2 (03/2012)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 9, N° 2 (03/2012) . - p. 203-214 Titre : Effect of polysiloxane additives on the scratch resistance of an acrylic melamine automotive clearcoat Type de document : texte imprimé Auteurs : Bahram Ramezanzadeh, Auteur ; Siamak Moradian, Auteur ; Alireza Khosravi, Auteur ; N. Tahmassebi, Auteur Année de publication : 2012 Article en page(s) : p. 203-214 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Automobiles -- Vernis Dureté (matériaux) Microscopie Microscopie électronique Résistance à l'abrasion Silicones Les silicones, ou polysiloxanes, sont des composés inorganiques formés d'une chaine silicium-oxygène (...-Si-O-Si-O-Si-O-...) sur laquelle des groupes se fixent, sur les atomes de silicium. Certains groupes organiques peuvent être utilisés pour relier entre elles plusieurs de ces chaines (...-Si-O-...). Le type le plus courant est le poly(diméthylsiloxane) linéaire ou PDMS. Le second groupe en importance de matériaux en silicone est celui des résines de silicone, formées par des oligosiloxanes ramifiés ou en forme de cage (wiki). Vernis -- Additifs Viscoélasticité Index. décimale : 667.9 Revêtements et enduits Résumé : Many attempts have been carried out to increase the scratch resistance of clearcoats using various appropriate additives. These additives may increase surface hardness or surface slippage, and/or enhance the bulk mechanical strength of the clearcoat. In the present study, the influence of various added loads of three differently structured polysiloxane additives on the scratch resistances of an acrylic melamine clearcoat was investigated. A series of analytical instruments, such as a laboratory carwash simulator, a scanning electron microscope, an optical microscope and an attenuated total reflectance Fourier transform infrared spectroscope, and others were used to compare the effects of the various added contents of polysiloxane additives on changes in the viscoelastic properties and scratch morphologies of the resultant clearcoats. The results illustrated that all polysiloxane additives improve the scratch resistance of such clearcoats, yet the optimum load varied for each individual additive. There is also a good indication that polyether-modified polysiloxanes improve scratch resistance by increasing surface hardness, while the fluorocarbon-modified polysiloxane tends to change the viscoelastic properties of the clearcoats. It was also found that scratch resistance varied linearly with Micro-Vickers’ hardness for brittle clearcoats. Note de contenu : - EXPERIMENT : Investigated paint system - Scratch test - MECHANICAL PROPERTIES : Microindentation - Tensile test - SURFACE ANALYSES : ATR-FTIR spectroscopy - Surface roughness DOI : 10.1007/s11998-010-9239-4 En ligne : https://link.springer.com/content/pdf/10.1007/s11998-010-9239-4.pdf?pdf=button Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=14373 [article]

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Effects of the side chain density of polycarboxylate dispersants on dye dispersion properties / Hamid Gharanjig in COLORATION TECHNOLOGY, Vol. 135, N° 2 (04/2019)  

[article]  inCOLORATION TECHNOLOGY > Vol. 135, N° 2 (04/2019) . - p. 160-168 Titre : Effects of the side chain density of polycarboxylate dispersants on dye dispersion properties Type de document : texte imprimé Auteurs : Hamid Gharanjig, Auteur ; Kamaladin Gharanjig, Auteur ; Alireza Khosravi, Auteur Année de publication : 2019 Article en page(s) : p. 160-168 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Agents dispersants (chimie) Agents dispersants (chimie) -- Synthèse Caractérisation Colorants -- Solubilité Dispersions et suspensions Dispersions et suspensions -- Stabilité Granulométrie Polycarboxylates Polyesters Polymères en émulsion Polymères ramifiés Spectrophotométrie Stabilité thermique Teinture -- Fibres textiles synthétiques Turbidimétrie La turbidimétrie est la mesure du degré de turbidité d'une suspension. Elle est déterminée grâce à un système optique, en général un spectrophotomètre classique, qui mesure la diminution, due à l'absorbance, de l'intensité d'un rayon lumineux de longueur d'onde connue traversant la suspension. La turbidimétrie est utilisée en complément à la néphélométrie qui se base plutôt sur la diminution de l'intensité par diffusion de la lumière. Index. décimale : 667.2 Colorants et pigments Résumé : Comb‐like polycarboxylates were synthesised by copolymerisation of methacrylic acid and nonylphenol polyethylene glycol methacrylate ester, and can be used as dye dispersants. In order to achieve good dispersive ability, three polycarboxylates were synthesised, each having a different side chain density. The side chain density of polymers was controlled by different ratios of monomers in the copolymerisation process. Acidic polymers were neutralised using sodium hydroxide. These polymers exhibit good dispersing performance, such that carboxylate groups are adsorbed onto the dye particle surface and the side chains enable the formation of a thick layer, thus providing the steric hindrance effect. Improvement of dye dissolution in the presence of polycarboxylates was studied. Polymers with a lower side chain density demonstrated a higher dye dissolution in water, which could be as a result of more effective adsorption of dispersant on the dye surface (CI Disperse Blue 79). The dyeing performance of the prepared dye dispersions on polyester was investigated. Spectrophotometric analysis of dyed fabrics using synthesised polycarboxylates demonstrates that there should be an optimum side chain density of polymer in order to control both dye solubility and dispersive ability. The result of turbidimetry and particle size analysis have proven this phenomenon. A comb‐like polycarboxylate with optimum side chain density was a better dye dispersant compared with a commercial sodium naphthalene sulphonate compound, as a result of its better heat stability. Note de contenu : - EXPERIMENTAL : Chemicals and apparatus - Synthesis of dispersants - Solubility of CI Disperse Blue 79 - Optimisation of dispersant concentration - Dye dispersion stability - Measurement of build-up - Investigation of the heat stability of dye dispersions - RESULTS AND DISCUSSION : Characterisation - Dye solubility - Effect of dispersant concentration on dyeing - Dye dispersion stability - Effect of polycarboxylates on build-up - Effect of polycarboxylates on the heat stability of dye dispersions DOI : 10.1111/cote.12391 En ligne : https://onlinelibrary.wiley.com/doi/epdf/10.1111/cote.12391 Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=32330 [article]

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Solubilisation kinetics of some monoazo naphthalimide disperse dyes containing butyric acid and investigation of fastness properties of the dyes on polyester / Kamaladin Gharanjig in COLORATION TECHNOLOGY, Vol. 126, N° 1 (2010)  

[article]  inCOLORATION TECHNOLOGY > Vol. 126, N° 1 (2010) . - p. 37-41 Titre : Solubilisation kinetics of some monoazo naphthalimide disperse dyes containing butyric acid and investigation of fastness properties of the dyes on polyester Type de document : texte imprimé Auteurs : Kamaladin Gharanjig, Auteur ; Mousa Sadeghi-Kiakhani, Auteur ; Mokhtar Arami, Auteur ; N. M. Mahmoodi, Auteur ; Alireza Khosravi, Auteur Année de publication : 2010 Article en page(s) : p. 37-41 Note générale : Bibliogr. Langues : Anglais (eng) Index. décimale : 667.3 Teinture et impression des tissus Résumé : In this paper, the solubilisation kinetics of three novel monoazo disperse dyes based on naphthalimdes incorporating a butyric acid group were investigated in different conditions using spectrophotometry. All dyes showed a reasonable level of solubilisation in alkaline media. Kinetic studies of the solubilisation reaction of the dyes in alkaline media showed that the rate of solubilisation of all dyes is a pseudo first-order reaction equation. The rate constants of the solubilisation reaction of the dyes in alkaline media indicated that dye 3, which is prepared by the diazotisation of 4-amino-n-butyric acid 1,8-naphthalimide and coupled with N,N-diethy-n-hydroxyethyllaniline, has the highest rate of reaction and dye 1, which is prepared by the diazotisation of 4-amino-n-butyric acid 1,8-naphthalimide and coupled with N,N-diethylaniline, has the lowest rate. The dyes were applied on polyester fabrics and their fastness properties were examined. The dyed fabrics showed a good to excellent degree of wash and rubbing fastnesses after replacing reduction clearing with alkali clearing. DOI : 10.1111/j.1478-4408.2010.00225.x En ligne : http://onlinelibrary.wiley.com/doi/10.1111/j.1478-4408.2010.00225.x/pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=8416 [article]

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Synthesis and application of some novel antimicrobial monoazonaphthalimide dyes : synthesis and characterisation / Hanieh Shaki in COLORATION TECHNOLOGY, Vol. 128, N° 4 (2012)  

[article]  inCOLORATION TECHNOLOGY > Vol. 128, N° 4 (2012) . - p. 270-275 Titre : Synthesis and application of some novel antimicrobial monoazonaphthalimide dyes : synthesis and characterisation Type de document : texte imprimé Auteurs : Hanieh Shaki, Auteur ; Kamaladin Gharanjig, Auteur ; Shohre Rouhani, Auteur ; Alireza Khosravi, Auteur ; Javad Fakhar, Auteur Année de publication : 2012 Article en page(s) : p. 270-275 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Antimicrobiens Caractérisation Colorants -- Chimie Colorants -- Synthèse Colorants azoïques Index. décimale : 667.3 Teinture et impression des tissus Résumé : A series of novel monoazo dyes based on N-pyridine-1,8-naphthalimides were prepared using 4-amino-N-2-aminomethylpyridine-1,8-naphthalimide as the diazo component and N,N-diethyl-meta-toluidine, 3-(N,N-diethylamino)acetanilide and N-hydroxyethyl-N-ethylaniline as the coupling components. The synthesised dyes were purified by utilising column and preparative thin-layer chromatography methods. The characterisations of the prepared dyes were carried out by differential scanning calorimetery, thin-layer chromatography (Rf values), Fourier Transform infrared, and proton and carbon nuclear magnetic resonance techniques. The in vitro antibacterial activity of the novel synthesised compounds against Escherichia coli, Staphylococcus aureus, Bacillus subtilis and their antifungal activity against Candida albicans were evaluated by use of conventional agar dilution procedures and a minimum inhibitory concentration. Some of these synthesised dyes demonstrated antibacterial activity against Gram-positive bacteria in addition to antifungal activities. Note de contenu : - EXPERIMENTAL : Materials, equipment and analysis - Synthesis of acid dye 1 - Synthesis of acyl chloride 2 - Synthesis of disperse dyes 3a-i - Dye sorption - Shade depth - Fastness - Partition coefficient and standard affinity - RESULTS AND DISCUSSION : Synthesis and characterisation - Spectral - Dye sorption and standard affinity - Colour build-up and colour fastness DOI : 10.1111/j.1478-4408.2012.00374.x En ligne : http://onlinelibrary.wiley.com/doi/10.1111/j.1478-4408.2012.00374.x/pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=15674 [article]

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Synthesis of a novel fluorescent coloured copolymer based on 4-butylthio-1,8-naphthalimide / Bahareh Safabakhsh in COLORATION TECHNOLOGY, Vol. 128, N° 3 (2012)

[article]  inCOLORATION TECHNOLOGY > Vol. 128, N° 3 (2012) . - p. 218-222 Titre : Synthesis of a novel fluorescent coloured copolymer based on 4-butylthio-1,8-naphthalimide Type de document : texte imprimé Auteurs : Bahareh Safabakhsh, Auteur ; Alireza Khosravi, Auteur ; Kamaladin Gharanjig, Auteur ; Elaheh Kowsari, Auteur ; Manouchehr Khorassani, Auteur ; Sina Tafaghodi, Auteur Année de publication : 2012 Article en page(s) : p. 218-222 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Colorants -- Synthèse Copolymères -- Synthèse Fluorescence Fluoropolymères Méthacrylate de méthyle Solvatochromisme Index. décimale : 667.3 Teinture et impression des tissus Résumé : A novel fluorescent coloured copolymer based on naphthalimide was prepared. Acenaphthene was brominated and oxidised to prepare 4-bromo-1,8-naphthalic anhydride and further reacted with butanethiol, 2-aminoethanol and acryloyl chloride, in order to obtain a new polymerisable fluorescent dye. The synthesised dyes were characterised by differential scanning calorimetry, absorption spectroscopy (Fourier Transform–infrared, proton and carbon nuclear magnetic resonance, ultraviolet–visible spectroscopy) and fluorimetry. Molar extinction coefficients and wavelength maxima were obtained by examining the dye solution in ethanol. The solvatochromic effects of the prepared dyes have also been investigated. Finally, the dye was copolymerised with methyl methacrylate and an intrinsically coloured copolymer was obtained. The photophysical characteristics of the obtained copolymer have also been considered. It is assumed that 99% of the copolymerised dye is chemically bonded to polymer chains. The fluorescent characteristics of the copolymer in the solid state were determined by fluorometer and it was found that it has relatively high fluorescent intensity. The physical properties of the synthesised copolymer have been evaluated by differential scanning calorimetry and gel permeation chromatography. Note de contenu : - EXPERIMENTAL : Materials - Instrumentation - Synthesis of intermediates, monomer and copolymer - RESULTS AND DISCUSSION : Synthesis of polymerisable dye - Spectrophotometric properties of dyes - Copolymerisation of the synthesised dye with MMA DOI : 10.1111/j.1478-4408.2012.00366.x Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=15124 [article]

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