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由美国海军发起,赫克利斯公司和赛奥科尔公司正联合研究一种负催化剂,三苯基铋(TPB)的化学性能,因它与交联双基(XLDB)推进剂的固化有关。测定了酸度(酸强度 pKa 和酸浓度)的作用,确定了活性 TPB 衍生物对酸的稳定性和反应性。研究了水作为催化剂可能的减活化剂的影响。另外,除了酸度能导致活化,还发现过氧化氢也能使 TPB 活化。PGA 的空气氧化是过氧化氢可能的来源,使用付利叶变换的红外光谱(FTIR)测定了推进剂组分对 TPB 催化的异氰酸酯——醇反应的延滞时间和固化速率的影响。
Initiated by the U.S. Navy, Heklis and Theo Cole are collaborating on the chemical properties of a negative catalyst, triphenylbismuth (TPB), as it relates to the cure of cross-linked bis (XLDB) propellants. The effects of acidity (acid strength pKa and acid concentration) were determined and the stability and reactivity of the active TPB derivatives to acids were determined. The effect of water as a possible deactivator was investigated. In addition, in addition to acidity can lead to activation, also found that hydrogen peroxide can also make TPB activation. Air oxidation of PGA is a potential source of hydrogen peroxide and the effect of propellant components on the lag time and cure rate of the TPB catalyzed isocyanate-alcohol reaction was determined using Fourier transform infrared spectroscopy (FTIR).