Impact of Heat Treatment on the Performance of Polymers as Ferric Ions Stabilization Agents for Aqueous Systems / Zahid Amjad in TENSIDE, SURFACTANTS, DETERGENTS, Vol. 45, N° 2/2008 (03-04/2008)

[article]  inTENSIDE, SURFACTANTS, DETERGENTS > Vol. 45, N° 2/2008 (03-04/2008) . - p. 66-71 Titre : Impact of Heat Treatment on the Performance of Polymers as Ferric Ions Stabilization Agents for Aqueous Systems Type de document : texte imprimé Auteurs : Zahid Amjad, Auteur Année de publication : 2008 Article en page(s) : p. 66-71 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Ions métalliques Polymères Stabilisants (chimie) Tags : Stabilité  thermique Index. décimale : 668.1 Agents tensioactifs : savons, détergents Résumé : The impact of heat treatment on the performance of various polymers as ferric ions stabilization agents in an aqueous system at pH 7.00, 23°C has been investigated. The polymers evaluated include: (a) homo-polymers of acrylic acid, methacrylic acid, maleic acid, 2-acrylamido-2-methylpropane sulfonic acid, sulfonated styrene; (b) co-polymers of acrylic acid:2-acrylamido-2-methylpropane sulfonic acid and maleic acid:sulfonated styrene, and (c) ter-polymers of acrylic acid:2-acryalamido-2-methylpropane sulfonic acid:sulfonated styrene, acrylic acid: methacrylic acid:t-butylacrylamide, and acrylic acid:2-acrylamido-2-methylpropane sulfonic acid:t-butylacrylamide. It has been found that all polymers lose performance to a varying degree when exposed to thermal treatment (150°C, 200°C, 240°C, 20hr). The performance data collected before and after thermal treatment suggest that sulfonated styrene containing co- and ter-polymers are better ferric ions stabilization agents than the co- and ter-polymers containing 2-acrylamido-2-methylpropane sulfonic acid and t-butylacrylamide. In addition, it has been found that heat treatment exhibits positive influence on the performance of homo-polymer of 2-acrylamido-2-methypropane sulfonic acid. The results have been explained in terms of loss of 2-acrylamido-2-methylpropane sulfonic acid and t-butylacrylamide in the co- and ter-polymers during thermal treatment. Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=3031 [article]

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Impact of surfactants on the efficacy of iron oxide dispersants / Zahid Amjad in TENSIDE, SURFACTANTS, DETERGENTS, Vol. 48, N° 3/2011 (05/2011)

[article]  inTENSIDE, SURFACTANTS, DETERGENTS > Vol. 48, N° 3/2011 (05/2011) . - p. 190-196 Titre : Impact of surfactants on the efficacy of iron oxide dispersants Type de document : texte imprimé Auteurs : Zahid Amjad, Auteur Année de publication : 2011 Article en page(s) : p. 190-196 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Agents dispersants (chimie) Oxyde de fer Polymères Surfactants Index. décimale : 668.1 Agents tensioactifs : savons, détergents Résumé : Surfactants form a unique class of compounds that are used in a variety of applications including laundry detergents, dish washing liquids, agrochemicals, pharmaceuticals, petroleum processing, mineral ores, personal care, floor cleaners, paints, coatings, fuel additives, and photographic films. In the present work a variety of surfactants containing different functional groups (i.e., anionic, non-ionic, amphoteric, cationic) has been used to study their influence on the performance of polymeric iron oxide dispersants. Effects of dispersant dosage, time, and polymer architecture have been investigated. The polymers tested include homopolymers of acrylic acid, maleic acid, methacrylic acid, 2-acrylamido-2-methylpropane sulfonic, 2-ethyloxazoline, and acrylic acid, maleic acid based copolymers containing different functional groups. It has been found that polymer performance as dispersant depends on dosage and polymer architecture. Results on the evaluation of surfactants suggest that compared to polymers, surfactants are ineffective iron oxide dispersants. Results on the impact of cationic surfactant (e.g., cetyltrimethyl ammonium chloride, CTAC) suggest that CTAC exhibits an antagonistic effect on the performance of polymers. It has also been found that cationic polymer (e. g., polydiallyldimethyl ammonium chloride) shows much stronger antagonistic effect than CTAC on the efficacy of polymers used as iron oxide dispersants in industrial water systems. The antagonistic behavior shown by cationic surfactant and cationic polymer on the performance of polymers has been explained in terms of cationic – anionic interactions. Note de contenu : - EXPERIMENTAL : Materials - Iron oxide dispersancy - RESULTS AND DISCUSSION : Polymer performance ( effect of dispersion time - effect of dispersant dosage - Effect of polymer architecture) - surfactant performance - Effect of cationic polymer on polymers performance - Iron oxide particle size characterization Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=11698 [article]

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Influence of heat treatment on the performance of polymers as gypsum (CaSO4 · 2H2O) scale inhibitors for industrial water applications / Zahid Amjad in TENSIDE, SURFACTANTS, DETERGENTS, Vol. 49, N° 6 (11-12/2012)

[article]  inTENSIDE, SURFACTANTS, DETERGENTS > Vol. 49, N° 6 (11-12/2012) . - p. 458-465 Titre : Influence of heat treatment on the performance of polymers as gypsum (CaSO4 · 2H2O) scale inhibitors for industrial water applications Type de document : texte imprimé Auteurs : Zahid Amjad, Auteur Année de publication : 2012 Article en page(s) : p. 458-465 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Gypse Inhibiteurs (chimie) Morphologie (matériaux) Polymères Structure cristalline (solide) Traitement thermique Index. décimale : 668.1 Agents tensioactifs : savons, détergents Résumé : The inhibition of gypsum precipitation by homo-, co-, and terpolymers has been examined in aqueous solution. It has been found that polymer performance as gypsum inhibitor depends upon polymer composition, type of comonomer, and functional groups. Results on the evaluation of polymers suggest that compared to co- and terpolymers, homopolymers containing carboxyl group are effective gypsum inhibitors. The impact of heat treatment (150°C to 240°C) on the performance of various homo-, co-, and teropolymers as gypsum inhibitors has also been investigated. It has been observed that all polymers lose performance to a varying degree when exposed to thermal treatment. Performance data on co- and terpolymers containing amido group show improved performance after heat treatment suggesting the formation of carboxyl group. Scanning electron microscopic investigations of gypsum crystals grown in the presence of polymers show that structures of these crystals are highly modified. DOI : 10.3139/113.110217 Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=16532 [article]

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Influence of polymer architecture on the stabilization of iron and manganese ions in aqueous systems / Zahid Amjad in TENSIDE, SURFACTANTS, DETERGENTS, Vol. 44, N° 4/2007 (08-09/2007)

[article]  inTENSIDE, SURFACTANTS, DETERGENTS > Vol. 44, N° 4/2007 (08-09/2007) . - p. 210-217 Titre : Influence of polymer architecture on the stabilization of iron and manganese ions in aqueous systems Type de document : texte imprimé Auteurs : Zahid Amjad, Auteur Année de publication : 2007 Article en page(s) : p. 210-217 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Fer Manganèse Polymères Solutions aqueuses (chimie) -- Stabilité Index. décimale : 668.1 Agents tensioactifs : savons, détergents Résumé : The influence of polymers as stabilizing additives for iron and manganese ions was investigated in an aqueous system. The polymers tested include : homo-polymers of acrylic acid, maleic acid, methacrylic acid, 2-acrylamido-2-methylpropane sulfonic acid; co-polymer of acrylic acid : vinyl acetate, acrylic acid : hydroxypropyl acrylate, acrylic acid : carbitol acrylate, acrylic acid : 2-acrylamido-2-methylpropane sulfonic acid; and ter-polymer of acrylic acid :methacrylic acid : acrylic acid : acrylic acid :2-acrylamido-2-methylpropane sulfonic acid : sulfonated styrene, acrylic acid : 2-acrylamido : t-butylacrylamide. It was found that polymer architecture i.e., monomer type, monomer charge, molecular weight, and polymerization solvent, strongly influences the performance of polymer as iron and manganese ions stabilizing additives. The stabilization data reveal the following order in terms of decreasing polymer performance: ter-polymer > copolymer > homo-polymer. DOI : 10.3139/113.100339 Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=3206 [article]

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Influence of surfactants on the performance of calcium phosphate scale inhibitors / Zahid Amjad in TENSIDE, SURFACTANTS, DETERGENTS, Vol. 48, N° 1/2010 (01-02/2011)

[article]  inTENSIDE, SURFACTANTS, DETERGENTS > Vol. 48, N° 1/2010 (01-02/2011) . - p. 53-59 Titre : Influence of surfactants on the performance of calcium phosphate scale inhibitors Type de document : texte imprimé Auteurs : Zahid Amjad, Auteur Année de publication : 2011 Article en page(s) : p. 53-59 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Chimie de l'environnement Inhibiteurs (chimie) Phosphate de calcium Précipitation (chimie) Surfactants Index. décimale : 668.1 Agents tensioactifs : savons, détergents Résumé : The pH-stat technique was used to study the influence of various types of surfactants on the performance of polymers used as inhibitors for preventing the precipitation of calcium phosphate in industrial water systems. Four types of surfactants were evaluated: 1) anionic, 2) non-ionic, 3) amphoteric, and 4) cationic. The polymeric inhibitors studied include homo-, co-, and terpolymers containing different functional groups such as carboxylic acid, sulfonic acid, ester, and amide. It has been found that polymer dosage and polymer architecture play important roles in inhibiting calcium phosphate precipitation. The results on the evaluation of surfactants reveal that all surfactants are ineffective calcium phosphate inhibitors. Comparative inhibition data collected for various calcium phosphate inhibiting polymers in the presence surfactants containing different ionic charges are presented. Results are also discussed on the influence of cationic polymeric flocculant in preventing the precipitation of calcium phosphate by anionic polymeric inhibitors. Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=10671 [article]

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