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General intercalation of poly(oxyalkylene) − amidoacids for anionic and cationic layered clays / Yi-Lin Liao in Industrial & engineering chemistry research, Vol. 49 N° 10 (Mai 2010) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 49 N° 10 (Mai 2010) . - pp. 5001–5005 Titre : General intercalation of poly(oxyalkylene) − amidoacids for anionic and cationic layered clays Type de document : texte imprimé Auteurs : Yi-Lin Liao, Auteur ; Chih-Wei Chiu, Auteur ; Jiang-Jen Lin, Auteur Année de publication : 2010 Article en page(s) : pp. 5001–5005 Note générale : Industrial chemistry Langues : Anglais (eng) Mots-clés : Ionic  clays  Hydroxides Résumé : The same poly(oxyalkylene)−amidoacids (POA−amidoacid) were incorporated into two different types of ionic clays, anionic layered-double-hydroxides (Mg−Al LDH), and cationic montmorillonite (MMT). Conventionally, the intercalation is an ionic exchange reaction, i.e. anionic organic salts for LDH and cationic salts for MMT. The successful intercalation using the neutral species of POA−amidoacid implies the existence of a new mechanism for clay intercalation. We prepared the POA−amidoacid from the reaction of maleic anhydride and poly(oxyalkylene)−diamine (POA−amine) with different hydrophobic and hydrophilic POA-backbones of 600−4200 molecular weight. The intercalation has resulted in the expansion of the clay basal spacing from 7.8 to 63 Å for LDH and from 12.4 to 51 Å for MMT, with a high Bragg’s regularity of XRD analyses. It appears that the driving force for the intercalation and organic incorporation into the silicate interlayer galleries is dissimilar to the counterion exchange but involving noncovalent bonding between amidoacid functionalities and ≡SiOH species in clay. The intercalation without ionic exchange reaction is effective for generating new clay hybrids with thermal responsiveness in water. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie901136u [article] General intercalation of poly(oxyalkylene) − amidoacids for anionic and cationic layered clays [texte imprimé] / Yi-Lin Liao, Auteur ; Chih-Wei Chiu, Auteur ; Jiang-Jen Lin, Auteur . - 2010 . - pp. 5001–5005. Industrial chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 49 N° 10 (Mai 2010) . - pp. 5001–5005 Mots-clés : Ionic  clays  Hydroxides Résumé : The same poly(oxyalkylene)−amidoacids (POA−amidoacid) were incorporated into two different types of ionic clays, anionic layered-double-hydroxides (Mg−Al LDH), and cationic montmorillonite (MMT). Conventionally, the intercalation is an ionic exchange reaction, i.e. anionic organic salts for LDH and cationic salts for MMT. The successful intercalation using the neutral species of POA−amidoacid implies the existence of a new mechanism for clay intercalation. We prepared the POA−amidoacid from the reaction of maleic anhydride and poly(oxyalkylene)−diamine (POA−amine) with different hydrophobic and hydrophilic POA-backbones of 600−4200 molecular weight. The intercalation has resulted in the expansion of the clay basal spacing from 7.8 to 63 Å for LDH and from 12.4 to 51 Å for MMT, with a high Bragg’s regularity of XRD analyses. It appears that the driving force for the intercalation and organic incorporation into the silicate interlayer galleries is dissimilar to the counterion exchange but involving noncovalent bonding between amidoacid functionalities and ≡SiOH species in clay. The intercalation without ionic exchange reaction is effective for generating new clay hybrids with thermal responsiveness in water. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie901136u

Mg – al layered double hydroxides intercalated with polyetheramidoacids and exhibiting a pH - responsive releasing property / Chih-Wei Chiu in Industrial & engineering chemistry research, Vol. 51 N° 1 (Janvier 2012) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 51 N° 1 (Janvier 2012) . - pp. 581–586 Titre : Mg – al layered double hydroxides intercalated with polyetheramidoacids and exhibiting a pH - responsive releasing property Type de document : texte imprimé Auteurs : Chih-Wei Chiu, Auteur ; Yi-Lin Liao, Auteur ; Jiang-Jen Lin, Auteur Année de publication : 2012 Article en page(s) : pp. 581–586 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Hydroxides  pH Résumé : Mg–Al layered double hydroxides (LDH) are prepared by coprecipitation of Mg(NO3)2 and Al(NO3)3 and subsequently incorporated with poly(oxypropylene)-bis-amidocarboxylic acid (POP). When characterized by X-ray diffraction, the interlayer spacing of the synthesized POP/LDH hybrids were found to be spatially expanded, with basal spacing ranging from 33–94 Å, proportionately correlated to the POP molecular weight of 400–4000 g/mol. With increasing POP molecular weight incorporation, a critical d-spacing is reached when the POP/LDH hybrids become hydrophobic. The organo-LDH units possessed an amphiphilic property and ability of dispersing in water, ethanol, and toluene. Furthermore, the hybrid was actually stable under basic conditions but structurally disintegrating at pH 2 through the release of POP organics into aqueous solution. The understanding of the mechanism involving basal spacing shrinkage and structure disintegration allows the future development of utilizing the POP-modified clay as pH-sensitive and self-destructive materials. DEWEY : 660 ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie201535n [article] Mg – al layered double hydroxides intercalated with polyetheramidoacids and exhibiting a pH - responsive releasing property [texte imprimé] / Chih-Wei Chiu, Auteur ; Yi-Lin Liao, Auteur ; Jiang-Jen Lin, Auteur . - 2012 . - pp. 581–586. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 51 N° 1 (Janvier 2012) . - pp. 581–586 Mots-clés : Hydroxides  pH Résumé : Mg–Al layered double hydroxides (LDH) are prepared by coprecipitation of Mg(NO3)2 and Al(NO3)3 and subsequently incorporated with poly(oxypropylene)-bis-amidocarboxylic acid (POP). When characterized by X-ray diffraction, the interlayer spacing of the synthesized POP/LDH hybrids were found to be spatially expanded, with basal spacing ranging from 33–94 Å, proportionately correlated to the POP molecular weight of 400–4000 g/mol. With increasing POP molecular weight incorporation, a critical d-spacing is reached when the POP/LDH hybrids become hydrophobic. The organo-LDH units possessed an amphiphilic property and ability of dispersing in water, ethanol, and toluene. Furthermore, the hybrid was actually stable under basic conditions but structurally disintegrating at pH 2 through the release of POP organics into aqueous solution. The understanding of the mechanism involving basal spacing shrinkage and structure disintegration allows the future development of utilizing the POP-modified clay as pH-sensitive and self-destructive materials. DEWEY : 660 ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie201535n