| 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 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 |
in COLORATION TECHNOLOGY > Vol. 135, N° 2 (04/2019) . - p. 160-168
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