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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]
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
TurbidimétrieLa 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 dispersionsDOI : 10.1111/cote.12391 En ligne : https://onlinelibrary.wiley.com/doi/epdf/10.1111/cote.12391 Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=32330
in COLORATION TECHNOLOGY > Vol. 135, N° 2 (04/2019) . - p. 160-168[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 20869 - Périodique Bibliothèque principale Documentaires Disponible Novel dispersants / Dave Haddleton in POLYMERS PAINT COLOUR JOURNAL - PPCJ, Vol. 195, N° 4485 (02/2005)
[article]
Titre : Novel dispersants Type de document : texte imprimé Auteurs : Dave Haddleton, Auteur ; Andrew Steward, Auteur Année de publication : 2005 Article en page(s) : p. 42-44 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Agents dispersants (chimie)
Agents dispersants (chimie) -- Synthèse
Caoutchouc
Copolymères séquencés
Méthacrylates
Monomères
PolydiméthylsiloxaneLe polydiméthylsiloxane —[O-Si(CH3)2]n—, ou poly(diméthylsiloxane) selon la nomenclature systématique, communément appelé PDMS ou diméthicone, est un polymère organominéral de la famille des siloxanes souvent présent dans les shampoings. On l'y ajoute pour augmenter le volume des cheveux mais il peut également aller boucher les pores du cuir chevelu et rendre les cheveux gras. C'est une des raisons pour lesquelles se laver les cheveux tous les jours est très déconseillé avec un shampooing contenant des silicones.
Il existe également de l'amodiméthicone, qui est un dérivé du diméthicone.
Le polydiméthylsiloxane est un additif alimentaire (E900), utilisé comme antimoussant dans les boissons (Coca-Cola BlāK).
La chaîne de poly(diméthylsiloxane) forme également la structure de base des huiles et des caoutchoucs silicones.
Polyéthylène glycol
Polymérisation
Polymérisation radicalaire par transfert d'atome
Revêtements -- Additifs:Peinture -- AdditifsIndex. décimale : 667.9 Revêtements et enduits Résumé : The authors explain why the drive to reduce VOC content of formulations and the need to increase loads while reducing resin levels is necessitating the development of improved dispersants.
The combination of the constant drive to reduce volatile organic compound (VOC) content of formulations and the need to increase pigments loads while reducing resin levels in pigment concentrates, is necessitating the development of improved dispersants. A great deal of effort has centred on new polymeric dispersants with novel polymer architecture and composition of both the pigment anchoring groups and the stabilising moieties.
Traditionally, free radical polymerisation (FRP) has been used to polymerise functional monomers which are required to make good pigment dispersants. FRP is robust with tolerance towards many impurities such as oxygen and heteroatoms.
However, FRP has limitations arising from non-selectivity, i.e. little control over polymer topology or architecture and limited control over molecular weight. It has beenf ound that block copolymers are generally more efficient dispersants than their random copolymer analogues, therefore, new polymerisation techniques are being investigated to develop a new range of dispersants to meet the increasingly demanding requirements of modern pigment dispersants.
Transition metal mediated living radical polymerisation (TMM-LR°) also known as atom transfer radical polymerisation (ATRP) allows a level of control un paralleled in polymer synthesis enabling the formation f well-defined polymer structures including block, grafs and hyperbranched copolymers as well as controlling alpha therminal functionality. Unlike many other living polymerisation techniques TMM-LRP is robust and tolerant to most impurities with the exception of acids. This makes the technology applicable to a wide range of monomers inlcuding, but no limited to, alkyl methacrylate, diethylaminoethylmethacrylate, PEG methacrylate, glycerol methacrylate, hydroxyethyl methacrylate, protected acid functional methacrylates and many styrenics.Note de contenu : - polymerisation technology
- Dispersant synthesisPermalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=27663
in POLYMERS PAINT COLOUR JOURNAL - PPCJ > Vol. 195, N° 4485 (02/2005) . - p. 42-44[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 000287 - Périodique Bibliothèque principale Documentaires Disponible Preparation of reactive nanoscale carbon black dispersion for pad coloration of cotton fabric / Cuiling Xu in COLORATION TECHNOLOGY, Vol. 134, N° 2 (04/2018)
[article]
Titre : Preparation of reactive nanoscale carbon black dispersion for pad coloration of cotton fabric Type de document : texte imprimé Auteurs : Cuiling Xu, Auteur ; Shaohai Fu, Auteur ; Liping Zhang, Auteur Année de publication : 2018 Article en page(s) : p. 91-99 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Agents dispersants (chimie) -- Synthèse
CotonLe coton est une fibre végétale qui entoure les graines des cotonniers "véritables"(Gossypium sp.), un arbuste de la famille des Malvacées. Cette fibre est généralement transformée en fil qui est tissé pour fabriquer des tissus. Le coton est la plus importante des fibres naturelles produites dans le monde. Depuis le XIXe siècle, il constitue, grâce aux progrès de l'industrialisation et de l'agronomie, la première fibre textile du monde (près de la moitié de la consommation mondiale de fibres textiles).
Dispersions et suspensions
Noir de carbone
Teinture -- Fibres textilesIndex. décimale : 667.3 Teinture et impression des tissus Résumé : A reactive dispersant (SMA–ESA) was synthesised from poly(styrene‐alt‐maleic anhydride) (SMA) and 4‐(beta‐sulfatoethylsulfonyl)aniline (ESA), and its dispersing ability for carbon black (CB) was investigated. Fourier transform infrared (FTIR) and 1H–nuclear magnetic resonance (NMR) spectroscopies showed that an amidation reaction took place between ESA and SMA. The optimal preparation conditions for reactive nanoscale CB dispersion were a mole ratio of ESA to SMA of 4:3, with a mass ratio of SMA–ESA and CB at 3%, sonication time 20 min, and pH 8. The reactive nanoscale CB dispersion prepared under optimal conditions showed excellent stability and small mean particle size. A cotton fabric coloured with reactive nanoscale CB dispersion could obtain a high K/S value, and excellent rubbing and washing fastness. Note de contenu : - EXPERIMENTAL : Materials - Synthesis and characterisation of SMA-ESA - Preparation of reactive nanoscale CB dispersion - Impregnated cotton fabrics - Properties of the reactive nanoscale CB dispersion - Colour performance of the coloured cotton fabrics
- RESULTS AND DISCUSSION Characterisation of SMA-ESA - Preparation of reactive nanoscale CB dispersion - Properties of reactive nanoscale CB dispersion - Pad coloration of cotton fabrics with reactive nanoscale pigment dispersionDOI : 10.1111/cote.12320 En ligne : https://onlinelibrary.wiley.com/doi/epdf/10.1111/cote.12320 Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=30312
in COLORATION TECHNOLOGY > Vol. 134, N° 2 (04/2018) . - p. 91-99[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 19748 - Périodique Bibliothèque principale Documentaires Disponible Synthesis and performance investigation of carbon black hyperdispersant IMD / Shuangshuang Jiang in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 20, N° 5 (09/2023)
[article]
Titre : Synthesis and performance investigation of carbon black hyperdispersant IMD Type de document : texte imprimé Auteurs : Shuangshuang Jiang, Auteur ; Jue Bai, Auteur ; Xiaogang Ying, Auteur ; Jianlin Han, Auteur ; Kai Zhu, Auteur ; Lianshan Mao, Auteur Année de publication : 2023 Article en page(s) : p. 1529-1539 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Agents dispersants (chimie) -- Synthèse
Caractérisation
Dispersions et suspensions -- Stabilité
Formulation (Génie chimique)
Noir de carbone
PolyadditionIndex. décimale : 667.9 Revêtements et enduits Résumé : An aqueous dispersion of carbon black is crucial in industrial coatings. In this manuscript, a hyperdispersant IBOMA-MPEGA-DMAM (IMD) has been synthesized using isobornyl methacrylate (IBOMA), polyethylene glycol monomethyl ether acrylate (MPEGA), and N, N-dimethyl acrylamide (DMAM) as monomers via a free radical polymerization method, which is used to improve the dispersibility of an aqueous dispersion system of carbon black. The molecular structure and performance stability of IMD were investigated through comprehensive characterizations of FTIR, GPC, particle size distribution and TEM. When the molar ratio of the monomers IBOMA:MEPGA:DMAM is 5.5:8.3:9.7, the obtained hyperdispersant shows good dispersibility. When the optimal dosage of dispersant IMD was 8%, the viscosity of carbon black slurry was as low as 18.6 mPa·s and the average particle size of carbon black was 275 nm. Furthermore, the stability of the prepared carbon black slurry was better than that of the two commercial dispersants. Note de contenu : - EXPERIMENTAL : Materials - Synthesis of hyperdispersant IBOMA-MPEGA-DMAM - Preparation of CB pigment by dispersion system - Central composite design (CCD) - Characterization
- RESULTS AND DISCUSSION : CCD optimizes monomer ratio - FTIR analysis - GPC analysis - The viscosity of CB dispersion - The average particle size of the CB dispersion - TEM analysis - Stability of CB dispersions
- Table 1 : Formula of CB dispersion
- Table 2 : Factors and levels of central composite design
- Table 3 : Experimental results of central composite design
- Table 4 : Statistical analysis of the experimental results
- Table 5 : Prediction and experimental values of viscosity of CB slurry prepared with dispersant
- Table 6 : Relative molecular weight of IMD of superdispersantDOI : https://doi.org/10.1007/s11998-023-00754-3 En ligne : https://link.springer.com/content/pdf/10.1007/s11998-022-00754-3.pdf?pdf=button Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=39969
in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 20, N° 5 (09/2023) . - p. 1529-1539[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 24242 - Périodique Bibliothèque principale Documentaires Disponible