Effect of the hardener to epoxy monomer ratio on the water absorption behavior of the DGEBA/TETA epoxy system
Abstract The water absorption behavior of the DGEBA/TETA epoxy system was evaluated as a function of the epoxy monomer to amine hardener ratio. Weight gain versus immersion time curves were obtained and the experimental points were fitted using Fickian and Non-Fickian diffusion models. The results obtained showed that for all epoxy monomer to hardener ratios analyzed water diffusion followed non-Fickian behavior. It was possible to correlate the water absorption behavior to the macromolecular structure developed when the epoxy/ hardener ratio was varied. All epoxy/hardener ratios present a two-phase macromolecular structure, composed of regions with high crosslink density and regions with lower crosslinking. Epoxy rich systems have a more open macromolecular structure with a lower fraction of the dense phase than the amine rich systems, which present a more compact two-phase structure.
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Associação Brasileira de Polímeros
2016
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oai:scielo:S0104-142820160001000052016-12-16Effect of the hardener to epoxy monomer ratio on the water absorption behavior of the DGEBA/TETA epoxy systemPereira,Ayrton Alef Castanheirad’Almeida,José Roberto Moraes water absorption epoxy resins hardener to epoxy monomer ratio Abstract The water absorption behavior of the DGEBA/TETA epoxy system was evaluated as a function of the epoxy monomer to amine hardener ratio. Weight gain versus immersion time curves were obtained and the experimental points were fitted using Fickian and Non-Fickian diffusion models. The results obtained showed that for all epoxy monomer to hardener ratios analyzed water diffusion followed non-Fickian behavior. It was possible to correlate the water absorption behavior to the macromolecular structure developed when the epoxy/ hardener ratio was varied. All epoxy/hardener ratios present a two-phase macromolecular structure, composed of regions with high crosslink density and regions with lower crosslinking. Epoxy rich systems have a more open macromolecular structure with a lower fraction of the dense phase than the amine rich systems, which present a more compact two-phase structure.info:eu-repo/semantics/openAccessAssociação Brasileira de PolímerosPolímeros v.26 n.1 20162016-03-01info:eu-repo/semantics/articletext/htmlhttp://old.scielo.br/scielo.php?script=sci_arttext&pid=S0104-14282016000100005en10.1590/0104-1428.2106 |
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Pereira,Ayrton Alef Castanheira d’Almeida,José Roberto Moraes |
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Pereira,Ayrton Alef Castanheira d’Almeida,José Roberto Moraes Effect of the hardener to epoxy monomer ratio on the water absorption behavior of the DGEBA/TETA epoxy system |
author_facet |
Pereira,Ayrton Alef Castanheira d’Almeida,José Roberto Moraes |
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Pereira,Ayrton Alef Castanheira |
title |
Effect of the hardener to epoxy monomer ratio on the water absorption behavior of the DGEBA/TETA epoxy system |
title_short |
Effect of the hardener to epoxy monomer ratio on the water absorption behavior of the DGEBA/TETA epoxy system |
title_full |
Effect of the hardener to epoxy monomer ratio on the water absorption behavior of the DGEBA/TETA epoxy system |
title_fullStr |
Effect of the hardener to epoxy monomer ratio on the water absorption behavior of the DGEBA/TETA epoxy system |
title_full_unstemmed |
Effect of the hardener to epoxy monomer ratio on the water absorption behavior of the DGEBA/TETA epoxy system |
title_sort |
effect of the hardener to epoxy monomer ratio on the water absorption behavior of the dgeba/teta epoxy system |
description |
Abstract The water absorption behavior of the DGEBA/TETA epoxy system was evaluated as a function of the epoxy monomer to amine hardener ratio. Weight gain versus immersion time curves were obtained and the experimental points were fitted using Fickian and Non-Fickian diffusion models. The results obtained showed that for all epoxy monomer to hardener ratios analyzed water diffusion followed non-Fickian behavior. It was possible to correlate the water absorption behavior to the macromolecular structure developed when the epoxy/ hardener ratio was varied. All epoxy/hardener ratios present a two-phase macromolecular structure, composed of regions with high crosslink density and regions with lower crosslinking. Epoxy rich systems have a more open macromolecular structure with a lower fraction of the dense phase than the amine rich systems, which present a more compact two-phase structure. |
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Associação Brasileira de Polímeros |
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2016 |
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http://old.scielo.br/scielo.php?script=sci_arttext&pid=S0104-14282016000100005 |
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AT pereiraayrtonalefcastanheira effectofthehardenertoepoxymonomerratioonthewaterabsorptionbehaviorofthedgebatetaepoxysystem AT dalmeidajoserobertomoraes effectofthehardenertoepoxymonomerratioonthewaterabsorptionbehaviorofthedgebatetaepoxysystem |
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