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Design rules for microgel - supported adhesives / Quan Wen in Industrial & engineering chemistry research, Vol. 51 N° 28 (Juillet 2012) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 51 N° 28 (Juillet 2012) . - pp. 9564–9570 Titre : Design rules for microgel - supported adhesives Type de document : texte imprimé Auteurs : Quan Wen, Auteur ; Robert Pelton, Auteur Année de publication : 2012 Article en page(s) : pp. 9564–9570 Note générale : Industrial chemistry Langues : Anglais (eng) Mots-clés : Microgel Résumé : The ability of carboxylated PNIPAM microgels bearing adsorbed PVAm to increase the strength of wet paper and wet cellulose film laminates was measured as a function of the microgel diameter, cross-linking degree, PVAm molecular weight, and roughness of the cellulose substrates. The experimental results and simulations from a model led to the following design rules: (1) For low microgel dosages, small microgels are better because they cover more surface; however, very small gels can get buried in pores. (2) For high microgel dosages, larger gels are better because a saturated monolayer of adsorbed large gels puts more adhesive in the joints. (3) Adhesion increases with decreasing microgel modulus (cross-linking). (4) Adhesion is not sensitive to the molecular weight of the reactive PVAm microgel coating polymer. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie3009428 [article] Design rules for microgel - supported adhesives [texte imprimé] / Quan Wen, Auteur ; Robert Pelton, Auteur . - 2012 . - pp. 9564–9570. Industrial chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 51 N° 28 (Juillet 2012) . - pp. 9564–9570 Mots-clés : Microgel Résumé : The ability of carboxylated PNIPAM microgels bearing adsorbed PVAm to increase the strength of wet paper and wet cellulose film laminates was measured as a function of the microgel diameter, cross-linking degree, PVAm molecular weight, and roughness of the cellulose substrates. The experimental results and simulations from a model led to the following design rules: (1) For low microgel dosages, small microgels are better because they cover more surface; however, very small gels can get buried in pores. (2) For high microgel dosages, larger gels are better because a saturated monolayer of adsorbed large gels puts more adhesive in the joints. (3) Adhesion increases with decreasing microgel modulus (cross-linking). (4) Adhesion is not sensitive to the molecular weight of the reactive PVAm microgel coating polymer. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie3009428

Effect of cross - linking fiber joints on the tensile and fracture behavior of paper / Andrew T. Horvath in Industrial & engineering chemistry research, Vol. 49 N° 14 (Juillet 2010) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 49 N° 14 (Juillet 2010) . - pp. 6422–6431 Titre : Effect of cross - linking fiber joints on the tensile and fracture behavior of paper Type de document : texte imprimé Auteurs : Andrew T. Horvath, Auteur ; Robert Pelton, Auteur ; Per Tomas Larsson, Auteur Année de publication : 2010 Article en page(s) : pp. 6422–6431 Note générale : Industrial chemistry Langues : Anglais (eng) Mots-clés : Fracture  properties  paper Résumé : The tensile and fracture properties of cross-linked paper were investigated at low and high relative humidity by cross-linking the joints formed between fibers. Cationic acetal dextran served as a model cross-linking agent, as it can be prepared to adsorb specifically to the fiber surface. Thus, cross-linking occurs only in the joints between fibers. The kinetics of hydrolysis was investigated to optimize the stock preparation, such that the resulting aldehyde groups react as the paper is dried. The effect of the cross-link density on the tensile and fracture properties was studied by varying the amount of acetal groups adsorbed to the pulp fibers. At low humidity, cross-linking improved the tensile and fracture properties of paper, although lower cross-link densities yielded better properties. Cross-linking was not effective at high relative humidty, as the tensile strength and stiffness were not improved. However, the fracture properties were significantly improved. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie100334z [article] Effect of cross - linking fiber joints on the tensile and fracture behavior of paper [texte imprimé] / Andrew T. Horvath, Auteur ; Robert Pelton, Auteur ; Per Tomas Larsson, Auteur . - 2010 . - pp. 6422–6431. Industrial chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 49 N° 14 (Juillet 2010) . - pp. 6422–6431 Mots-clés : Fracture  properties  paper Résumé : The tensile and fracture properties of cross-linked paper were investigated at low and high relative humidity by cross-linking the joints formed between fibers. Cationic acetal dextran served as a model cross-linking agent, as it can be prepared to adsorb specifically to the fiber surface. Thus, cross-linking occurs only in the joints between fibers. The kinetics of hydrolysis was investigated to optimize the stock preparation, such that the resulting aldehyde groups react as the paper is dried. The effect of the cross-link density on the tensile and fracture properties was studied by varying the amount of acetal groups adsorbed to the pulp fibers. At low humidity, cross-linking improved the tensile and fracture properties of paper, although lower cross-link densities yielded better properties. Cross-linking was not effective at high relative humidty, as the tensile strength and stiffness were not improved. However, the fracture properties were significantly improved. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie100334z