Artigo
Efeito da concentração do catalisador acetilacetonato férrico na cura de poliuretano à base de polibutadieno líquido hidroxilado (PBLH) e diisocianato de isoforona (IPDI)
Fecha
2002-05-01Registro en:
Química Nova. Sociedade Brasileira de Química, v. 25, n. 2, p. 221-225, 2002.
0100-4042
10.1590/S0100-40422002000200009
S0100-40422002000200009
S0100-40422002000200009.pdf
4378078337343660
0000-0001-8338-4879
Autor
Universidade Estadual Paulista (Unesp)
Centro Técnico Aeroespacial Instituto Tecnológico de Aeronáutica Departamento de Física
Centro Técnico Aeroespacial Instituto Tecnológico de Aeronáutica Divisão de Química
Centro Técnico Aeroespacial Instituto de Aeronáutica e Espaço Divisão de Materiais
Resumen
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).