Abstract
Nitroglycerine (NG) migration in polyurethane (PU) inhibitor, which leads to ballistic malfunctions or tearing-down of the rockets for double-base rocket propellants, is investigated by thermal analysis–thermogravimetry/quadrupole mass spectrometer (TG/QMS) after accelerating migration at 65 °C. NG content increases before 48 h and then decreases dramatically till 84 h, after that it tends to stabilize and reaches 4.5 %. The thermal stability of PU is affected by NG migration, which brings down the onset temperature of PU at low-temperature zone, and accelerates the break of C–O bond in the main chain of polymer. In order to minimize the NG migration, the isolation coating consisting of 3-aminopropyltriethoxysilane (KH-550), phenolic resin (PF), and polyvinyl butyral (PVB) was designed and reduced the NG content to 0.48 %.
Published Version
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