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Behavior of Hydrogel Microparticles Based on Acrylamide and 2-HEMA Obtained By Inverse Emulsion

Published online by Cambridge University Press:  16 March 2015

Raymundo Sanchez-Orozco ,
Salomon R. Vasquez-Garcia ,
Nelly Flores-Ramirez  and
Lada Domratcheva
Raymundo Sanchez-Orozco
Affiliation:
Universidad Politecnica de Atlacomulco, Estado de México 50450, Mexico
Salomon R. Vasquez-Garcia
Affiliation:
Faculty of Chemical Engineering, Universidad Michoacana de San Nicolas de Hidalgo (UMSNH), Morelia 58030, Mexico
Nelly Flores-Ramirez
Affiliation:
Faculty of Wood Engineering and Technology, UMSNH, Morelia 58030, Mexico
Lada Domratcheva
Affiliation:
Faculty of Wood Engineering and Technology, UMSNH, Morelia 58030, Mexico
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Abstract

Poly(acrylamide-co-2-hydroxyethyl methacrylate), hydrogel microparticles were prepared by free radical copolymerization of acrylamide (AAm) and 2-hydroxyethyl methacrylate (2-HEMA) using an inverse emulsion polymerization technique, employing ethylene glycol dimethylacrylate (EGDMA) as crosslinker in the presence of w/o emulsifiers span-80 and span-85 (sorbitol mono-oleate) above the lower critical solution temperature. Water absorption capacity and characteristics of the hydrogel microparticles were analyzed by Optical Microscopy (OM), Scanning Electron Microscopy (SEM), Fourier Transform Infrared Spectroscopy (FTIR) and Thermogravimetric Analysis (TGA). Thus, microparticles were submitted to a gravimetric study on their ability to absorb and to retain distilled water at 25°C. One gram of microparticles absorbed at least 15 g of water. By varying the relative ratio between the continuous phase (hexane and emulsifiers) and the dispersed phase (monomers, initiator and crosslinker), non-agglomerated dispersed particles with nearly spherical shape were obtained having a narrow size distribution in the range from 10 to 20 µm. At a constant value of the emulsifier, and as a result of increasing the stirring rate, a particle size reduction was observed from 13 to 7 µm. The PAAm and PHEMA structures of synthesized hydrogel were confirmed using FTIR analysis. Additionally, through thermal analysis the P(AAm-HEMA) hydrogel showed an increase of water retention and thermal stability due to PAAm addition.

Keywords

macromolecular structurescanning electron microscopy (SEM)thermogravimetric analysis (TGA)
Type
Articles
Information
MRS Online Proceedings Library (OPL) , Volume 1767: Symposium 5C – New Trends in Polymer Chemistry and Characterization , 2015 , pp. 43 - 48
Copyright
Copyright © Materials Research Society 2015 

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References

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