Please use this identifier to cite or link to this item: https://hdl.handle.net/20.500.12104/40550
Title: Determination of a limiting dispersed phase concentration for coalescence in PA6/HDPE blends under extensional flow
Author: Becerra-Bracamontes, F.
Sanchez-Diaz, J.C.
Gonzalez-Alvarez, A.
Ortega-Gudino, P.
Michel-Valdivia, E.
Martinez-Ruvalcaba, A.
Issue Date: 2007
Abstract: To obtain biodegradable materials for biomedical applications, new biopolymeric hydrogels based on blends of Polyacrylamide nanoparticles and chitosan have been prepared. In this work, we have studied the behavior of the diffusion of ascorbic acid (V-C) from poly(acrylamideco-acrylic acid)/chitosan nanostructured hydrogels. The process involves the synthesis of nanoparticles of Polyacrylamide by inverse microemulsion polymerization and their complfixation with chitosan dissolved in an acrylic acid aqueous solution. We have studied the effect of the concentration of the Polyacrylamide nanoparticles, which are cross-linked with N,N?-methylenebisacrylamide, in the delivery of V-C. The results indicate that the drug delivery operates by a non-Fickian mechanism. Also, we have obtained the diffusion coefficient for V-C in gels for different nanoparticle concentrations, using a modified form of Fick's second law that takes into account dimensional changes in the hydrogels during drug release. " 2007 Wiley Periodicals, Inc.",,,,,,"10.1002/app.26992",,,"http://hdl.handle.net/20.500.12104/40550","http://www.scopus.com/inward/record.url?eid=2-s2.0-36349006929&partnerID=40&md5=b275a03603dfa87ef02e536cb51b9837",,,,,,"6",,"Journal of Applied Polymer Science",,"3939
3944",,"106",,"Scopus
WOS",,,,,,"Chitosan; Drug delivery systems; Hydrogels; Nanoparticles; Nanotechnology",,,,,,"Design of a drug delivery system based on poly(acrylamide-co-acrylic acid)/chitosan nanostructured hydrogels",,"Article" "44888","123456789/35008",,"García-Real, E., Inst. Manantlan Ecologia C., Centro Universitario de la Costa Sur, Universidad de Guadalajara, Avenida Independencia Nacional 151, Autlán, Jalisco, C. P. 48900, Mexico; Rivera-Cervantes, L.E., Inst. Manantlan Ecologia C., Centro Universitario de la Costa Sur, Universidad de Guadalajara, Avenida Independencia Nacional 151, Autlán, Jalisco, C. P. 48900, Mexico; Palomera-García, C., Inst. Manantlan Ecologia C., Centro Universitario de la Costa Sur, Universidad de Guadalajara, Avenida Independencia Nacional 151, Autlán, Jalisco, C. P. 48900, Mexico",,"García-Real, E.
Rivera-Cervantes, L.E.
Palomera-García, C.",,"2005",,"[No abstract available]",,,,,,,,,"http://hdl.handle.net/20.500.12104/43109","http://www.scopus.com/inward/record.url?eid=2-s2.0-17844406666&partnerID=40&md5=c750f9cec93d518ed5ed8cbdad6c350d",,,,,,"2",,"Entomological News",,"107
110",,"116",,"Scopus
WOS",,,,,,,,,,,,"New distributional records for Nicrophorus marginatus fabricius (Coleoptera: Silphidae) from Jalisco, Mexico",,"Article" "42354","123456789/35008",,"González-Nuez, R., Departamento de Ingeniería Química, Universidad de Guadalajara, Blvd. Gral. Marcelino G., Jalisco C.P. 44430, Mexico; Arellano, M., Departamento de Ingeniería Química, Universidad de Guadalajara, Blvd. Gral. Marcelino G., Jalisco C.P. 44430, Mexico; Moscoso, F.J., Departamento de Ingeniería Química, Universidad de Guadalajara, Blvd. Gral. Marcelino G., Jalisco C.P. 44430, Mexico; González-Romero, V.M., Departamento de Ingeniería Química, Universidad de Guadalajara, Blvd. Gral. Marcelino G., Jalisco C.P. 44430, Mexico; Favis, B.D., Department of Chemical Engineering, Ecole Polytechnique de Montreal, Montreal, Qbc. H3C 3A7, Canada",,"Gonzalez-Nuez, R.
Arellano, M.
Moscoso, F.J.
Gonzalez-Romero, V.M.
Favis, B.D.",,"2001",,"Blends of PA6/HDPE at different compositions and melt-draw ratio were prepared using a twin-screw extruder with a rectangular slit at 250°C. The morphology results show that at low take up velocity, the final state of deformation is independent of the dispersed phase composition. However, at high take up velocity the drop deformation increases with the composition. To determine a lower limiting concentration, at which coalescence occurs, the average particle volume of the dispersed phase was evaluated. In the concentration range of 1-4 vol% of PA6, the average volume of the particles remains constant (no coalescence) during the stretching process. However, at higher concentrations (>5 vol% of PA6) coalescence takes place and the volume increases with stretching. These results clearly indicate the limiting dispersed phase concentration for coalescence in this system under extensional flow. The approach used here represents a possible technique to separate out the relative contribution of single particle deformation and particle-particle coalescence in dispersed phase fiber formation in an extensional flow field. " 2001 Elsevier Science Ltd.
URI: http://hdl.handle.net/20.500.12104/40575
http://www.scopus.com/inward/record.url?eid=2-s2.0-0035080811&partnerID=40&md5=afdf708bca58dae7b4b8302f802c2faa
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