Reticulação de plastissóis de PVC utilizando resina epóxi polifuncional: Síntese e caracterização
Crosslinking of PVC plastisols using a polyfunctional epoxy resin: Synthesis and characterization
Rodolfo Junior, Antonio
http://dx.doi.org/10.4322/polimeros.2013.043
Polímeros: Ciência e Tecnologia, vol.23, n4, p.501-508, 2013
Resumo
Plastissois reticulados de PVC foram obtidos por meio de espalmagem, na presença de uma resina epóxi polifuncional tipo tetraglicidilmetilenodianilina (TGMDA). A presença de um amino acelerador, baseado numa poliaminoamida comercial, mostrou-se imprescindível para a ocorrência de reticulação das cadeias do PVC. Resultados de grau de reticulação mostraram que só houve formação de gel nas amostras onde o amino acelerador foi utilizado concomitantemente com a resina epóxi, evidenciando uma sinergia entre ambos. Apesar dos resultados de módulo de Young sugerirem a formação de uma rede tridimensional entre as moléculas do PVC e a resina epóxi, a comprovação de uma reação química de reticulação entre o PVC e a resina epóxi não foi possível, devido ao grande numero de moléculas presentes na formulação final. Entretanto, a evidência de que a reticulação de fato ocorreu poderá vir de estudos mais detalhados e o uso de outras técnicas de caracterização complementares, já iniciados.
Palavras-chave
PVC, poli(cloreto de vinila), plastissol, resina epóxi, polímeros hiperramificados, reticulação
Abstract
PVC plastisols, crosslinked in the presence of a polyfunctional epoxy resin, were obtained via spread coating. It was possible to infer that the presence of an amine type accelerator, at least in the conditions used in this study, proved to be essential for the occurrence of the crosslinking process. The results of reticulation degree showed that gel formation only happened in samples where the amine type accelerator has been used concomitantly with the epoxy resin. Despite the Young's modulus results seem to confirm the hypothesis of the formation of a three dimensional network between the molecules of PVC and epoxy resin, the evidence of a chemical reaction between these two polymers was not possible, because of the large number of molecules present in the formulation. However, the evidence that crosslinking actually occurred may come from more detailed studies and the use of other complementary characterization techniques, already started.
Keywords
PVC, poli(cloreto de vinila), plastissol, resina epóxi, polímeros hiperramificados, reticulação
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