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Reversible swelling / deswelling characteristics of ethylene glycol dimethacrylate cross - linked poly (acrylic acid - co - sodium acrylate - co - acrylamide) superabsorbents / Neelesh Bharti Shukla in Industrial & engineering chemistry research, Vol. 50 N° 19 (Octobre 2011) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 50 N° 19 (Octobre 2011) . - pp. 10918–10927 Titre : Reversible swelling / deswelling characteristics of ethylene glycol dimethacrylate cross - linked poly (acrylic acid - co - sodium acrylate - co - acrylamide) superabsorbents Type de document : texte imprimé Auteurs : Neelesh Bharti Shukla, Auteur ; Giridhar Madras, Auteur Année de publication : 2011 Article en page(s) : pp. 10918–10927 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Superabsorbent  polymers Résumé : Poly(acrylic acid-co-sodium acrylate-co-acrylamide) superabsorbent polymers (SAPs) cross-linked with ethylene glycol dimethacrylate (EGDMA) were synthesized by inverse suspension polymerization. The SAPs were swollen in DI water, and it was found that the equilibrium swelling capacities varied with the acrylamide content. The SAPs were subjected to reversible swelling/deswelling cycles in DI water and aqueous NaCl solution, respectively. The effect of the addition of an electrolyte on the swelling of the SAP was explored. The equilibrium swelling capacity of the SAPs was found to decrease with increasing concentration of added electrolyte in the swelling medium. The effect of the particle size of the dry SAPs on the swelling properties was also investigated. A first order model was used to describe the kinetics of swelling/deswelling, and the equilibrium swelling capacity, limiting swelling capacity, and swelling/deswelling rate coefficients were determined. DEWEY : 660 ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie200713y [article] Reversible swelling / deswelling characteristics of ethylene glycol dimethacrylate cross - linked poly (acrylic acid - co - sodium acrylate - co - acrylamide) superabsorbents [texte imprimé] / Neelesh Bharti Shukla, Auteur ; Giridhar Madras, Auteur . - 2011 . - pp. 10918–10927. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 50 N° 19 (Octobre 2011) . - pp. 10918–10927 Mots-clés : Superabsorbent  polymers Résumé : Poly(acrylic acid-co-sodium acrylate-co-acrylamide) superabsorbent polymers (SAPs) cross-linked with ethylene glycol dimethacrylate (EGDMA) were synthesized by inverse suspension polymerization. The SAPs were swollen in DI water, and it was found that the equilibrium swelling capacities varied with the acrylamide content. The SAPs were subjected to reversible swelling/deswelling cycles in DI water and aqueous NaCl solution, respectively. The effect of the addition of an electrolyte on the swelling of the SAP was explored. The equilibrium swelling capacity of the SAPs was found to decrease with increasing concentration of added electrolyte in the swelling medium. The effect of the particle size of the dry SAPs on the swelling properties was also investigated. A first order model was used to describe the kinetics of swelling/deswelling, and the equilibrium swelling capacity, limiting swelling capacity, and swelling/deswelling rate coefficients were determined. DEWEY : 660 ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie200713y

Swelling and Dye-Adsorption Characteristics of an Amphoteric Superabsorbent Polymer / Neelesh Bharti Shukla in Industrial & engineering chemistry research, Vol. 51 N° 46 (Novembre 2012) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 51 N° 46 (Novembre 2012) . - pp. 14941–14948 Titre : Swelling and Dye-Adsorption Characteristics of an Amphoteric Superabsorbent Polymer Type de document : texte imprimé Auteurs : Neelesh Bharti Shukla, Auteur ; Shruti Rattan, Auteur ; Giridhar Madras, Auteur Année de publication : 2013 Article en page(s) : pp. 14941–14948 Note générale : Industrial chemistry Langues : Anglais (eng) Mots-clés : Adsorption  Polymer Résumé : Amphoteric superabsorbent polymers (SAPs) based on the anionic monomer sodium acrylate (SA) and the cationic monomer [2-(methacryloyloxy)ethyl]trimethylammonium chloride (METAC) were synthesized by solution polymerization using N,N′-methylenebisacrylamide as a cross-linking agent. The ratio of anionic to cationic repeat units was varied to obtain anionic, cationic, and amphoteric SAPs. The synthesized SAPs were characterized by Fourier transform infrared spectroscopy. The equilibrium swelling capacity of the SAPs was found to be dependent on the nature and extent of the net charge on the SAPs but independent of pH. The equilibrium swelling capacity was lowest for the SAP whose ratio of anionic to cationic repeat units was unity. The equilibrium swelling capacity increased as this ratio deviated from unity. The adsorption of an anionic dye (orange G) and a cationic dye (methylene blue) was carried out from the individual solution as well as from their mixture. The adsorption of the dyes was found to be dependent on the nature and amount of net charge on the SAPs but independent of pH. The amount of the dye adsorbed decreased as the net charge on the amphoteric SAPs decreased. The amphoteric SAPs with net negative or positive charge selectively adsorbed oppositely charged dyes from the mixture, but the amounts adsorbed were lower than those adsorbed from the individual dye solutions. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie301839z [article] Swelling and Dye-Adsorption Characteristics of an Amphoteric Superabsorbent Polymer [texte imprimé] / Neelesh Bharti Shukla, Auteur ; Shruti Rattan, Auteur ; Giridhar Madras, Auteur . - 2013 . - pp. 14941–14948. Industrial chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 51 N° 46 (Novembre 2012) . - pp. 14941–14948 Mots-clés : Adsorption  Polymer Résumé : Amphoteric superabsorbent polymers (SAPs) based on the anionic monomer sodium acrylate (SA) and the cationic monomer [2-(methacryloyloxy)ethyl]trimethylammonium chloride (METAC) were synthesized by solution polymerization using N,N′-methylenebisacrylamide as a cross-linking agent. The ratio of anionic to cationic repeat units was varied to obtain anionic, cationic, and amphoteric SAPs. The synthesized SAPs were characterized by Fourier transform infrared spectroscopy. The equilibrium swelling capacity of the SAPs was found to be dependent on the nature and extent of the net charge on the SAPs but independent of pH. The equilibrium swelling capacity was lowest for the SAP whose ratio of anionic to cationic repeat units was unity. The equilibrium swelling capacity increased as this ratio deviated from unity. The adsorption of an anionic dye (orange G) and a cationic dye (methylene blue) was carried out from the individual solution as well as from their mixture. The adsorption of the dyes was found to be dependent on the nature and amount of net charge on the SAPs but independent of pH. The amount of the dye adsorbed decreased as the net charge on the amphoteric SAPs decreased. The amphoteric SAPs with net negative or positive charge selectively adsorbed oppositely charged dyes from the mixture, but the amounts adsorbed were lower than those adsorbed from the individual dye solutions. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie301839z