NDLI: Evaluación De Hidrogeles De Poli (acrilamida-co-metil Metacrilato) Sintetizados En Diferentes Solventes

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Evaluación De Hidrogeles De Poli (acrilamida-co-metil Metacrilato) Sintetizados En Diferentes Solventes

Content Provider	Semantic Scholar
Author	Moreno, Rafael O. Penott-Chang, Evis K. Souza, María Gabriela De Gáscue, Blanca Rojas De Müller, Alejandro J.
Copyright Year	2014
Abstract	Se sintetizaron hidrogeles de Poli(acrilamida– co -metil metacrilato) mediante copolimerizacion por radicales libres, en agua y en etanol, utilizando diferentes proporciones de monomeros en la alimentacion. Se uso N,N’ -metilenbisacrilamida (MBAm) como agente entrecruzante y persulfato de amonio (PSA) como iniciador. Los hidrogeles se caracterizaron por las tecnicas de FT-IR y gravimetria. Del analisis gravimetrico se obtuvieron los siguientes parametros: porcentaje de hidratacion en equilibrio, porcentaje de agua, el exponente de transporte n y la constante de difusion k dif , a 37⁰C. Se encontro que los hidrogeles presentaron un mecanismo de difusion anomalo no-Fickiano. Al sintetizarlos en etanol se produjo un aumento significativo de n , con resultados cercanos al valor de n = 1. Ademas, en estos ultimos hidrogeles se obtuvieron los mayores porcentajes de hinchamientos, lo que podria ser atribuido a una menor reticulacion de la red. Poly(acrylamide– co -methyl methacrylate) hydrogels were synthesized by radical copolymerization using different monomer ratios in water and ethanol. N,N - methylbisacrylamide (MBAm) was used as crosslinker and ammonium persulfate (PSA) as initiator. The hydrogels were characterized by FT-IR and gravimetry. Using gravimetry, the swelling parameters were obtained: swelling equilibrium index, water content, transport exponent n and swelling rate constant at 37 ⁰C. It was found that hydrogels presented anomalous non Fickian diffusion mechanism. Nevertheless, hydrogels synthesized in ethanol show a significant increase in n , with values close to 1. Moreover, these hydrogels exhibited higher swelling percentages that might indicate a decrease in the network crosslink density.
Starting Page	43
Ending Page	44
Page Count	2
File Format	PDF HTM / HTML
Alternate Webpage(s)	http://www.rlmm.org/ojs/index.php/rlmm/article/download/599/381
Language	English
Access Restriction	Open
Content Type	Text
Resource Type	Article

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