DSC 法与流变学法在测定 HTPB 基 PBX 代料固化动力学参数中的应用对比

In order to optimize the preparation process of polymer bonded explosive (PBX) and deeply understand its performance, and explore the best method suitable for studying the curing kinetics of PBX, the curing reaction kinetics of HTPB / TDI / Na₂ SO₄ / Al system are thoroughly investigated using non-isothermal differential scanning calorimetry (DSC) method, rheological isothermal method, and rheological non-isothermal method. The curing reaction kinetic equations are obtained under these three test conditions, and the widely used non-isothermal rheological method is optimized. The results show that The curing reaction between HTPB and TDI follows an autocatalytic model, and the activation energies of curing reaction obtained using Kissinger and Ozawa methods are similar, with a difference of no more than 3% between the two. The thermostatic curing of PBX surrogate system exhibits an onset temperature of 423. 29 K, a peak temperature of 440. 23 K, and a final temperature of 444. 49 K. The effect of temperature on the energy storage modulus needs to be considered in the rheological study of curing kinetics. The measured values cannot be used solely to characterize the degree of curing, and the data need to be corrected. DSC method and rheological method have their own advantages and disadvantages: if the objective is to obtain only the parameters of curing kinetics, the DSC method is a better choice. However, the rheological method must be used to understand the internal structure of slurry in the curing process.