Asymmetric bihomologous crosslinkers for bicomponent gels—The way to strongly increased elastic moduli |
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Authors: | Döne Demirgöz Rodrigo Navarro Mónica Pérez Helmut Reinecke Alberto Gallardo |
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Affiliation: | 1. Department of Chemical Engineering and Materials Science, University of Minnesota, Minneapolis, Minnesota;2. Instituto de Ciencia y Tecnología de Polímeros (CSIC), Juan de la Cierva 3, Madrid 28006, Spain |
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Abstract: | 2‐Hydroxyethylmethacrylate (HEMA) and acrylamide (AA) have been copolymerized via free radical mechanism, in the presence of 5 mol % of four different crosslinker systems, the symmetric ethylenglycoldimethacrylate (EGDMA), bisacrylamide (BIS), a mixture of EGDMA and BIS, and the asymmetric acrylamideethylenmethacrylate (METAA). The polymerizations have been monitored with a rheometer, exhibiting the gel obtained with the asymmetric METAA, an elastic modulus that is dramatically increased compared with those of the gels prepared with the other three crosslinker systems. A kinetic analysis using the terminal model has been used to build probabilistic surfaces that give information about how the crosslinker is incorporated into the network. This analysis shows a high dissimilarity between the reactions using the asymmetric and the mixture of symmetric crosslinkers, what has been correlated to the difference in modulus. © 2009 Wiley Periodicals, Inc. J Appl Polym Sci, 2010 |
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Keywords: | bicomponent networks copolymerization crosslinking reactivity |
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