Application of Reichardt’s Solvent Polarity Scale (ET(30)) in the Selection of Bonding Agents for Composite Solid Rocket Propellants

Bonding agents (BA) are key compounding ingredients for the correct formulation of composite solid rocket propellants (CSRP). In particular, addition BA is essential to achieve suitable mechanical properties CSRP in terms adequate tensile strength and elongation at break. It shown that polarity each conventional as well new potential can be measured through Reichardt’s ET(30) scale. Using this methodology, it was possible propose a substitute MAPO (tris-(methylaziridinyl)-phosphine oxide), with drawback high toxicity reactivity, TTPT (tris-(pyrrolidine)-phosphine completely safe effective BA. work, several other were evaluated scale but only selection effectively tested standard CSRP. The evaluation vs. showing ability former match latter particularly interesting. A reasonable correlation between break value used compound found.