Efeito da concentração do catalisador acetilacetonato férrico na cura de poliuretano à base de polibutadieno líquido hidroxilado (PBLH) e diisocianato de isoforona (IPDI)
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Data
2002-05-01
Autores
Paterlini, Willian César [UNESP]
Botelho, Edson Cocchieri [UNESP]
Rezende, Luís Cláudio
Lourenço, Vera Lucia
Rezende, Mirabel Cerqueira
Título da Revista
ISSN da Revista
Título de Volume
Editor
Sociedade Brasileira de Química
Resumo
The reaction between hydroxy-terminated polybutadiene and isophorone diisocyanate constitutes the base of the curing process of the most composite solid propellant used in the propulsion of solid rocket propellant. In this work, differential scanning calorimetry and viscosity measurements were used to evaluate the effect of the ferric acetylacetonate catalyst concentration on the reaction between HTBR and IPDI. These analyses show one exotherm, which shifts to lower temperatures as the catalyst concentration increases. The viscosity analyses show that the increase of temperature causes, at first, a reduction in the mixture viscosity, reaching a minimum range called gelification region (increasing the crosslinking density).
Descrição
Palavras-chave
differential scanning calorimetry (DSC), viscosity analysis, composite solid propellant
Como citar
Química Nova. Sociedade Brasileira de Química, v. 25, n. 2, p. 221-225, 2002.