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Química Nova

Print version ISSN 0100-4042On-line version ISSN 1678-7064

Abstract

PATERLINI, Willian César et al. Effect of ferric acetylacetonate catalyst concentration on the cure of polyurethane based on hydroxy terminated polybutadiene and isophorone diisocyanate. Quím. Nova [online]. 2002, vol.25, n.2, pp.221-225. ISSN 0100-4042.  http://dx.doi.org/10.1590/S0100-40422002000200009.

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).

Keywords : differential scanning calorimetry (DSC); viscosity analysis; composite solid propellant.

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