溶胀法测定NEPE推进剂的交联密度

Determination of the Cross-Link Density of NEPE Propellant by the Swelling Method

为分析NEPE推进剂的交联网络与推进剂性能的相互关系,研究了溶胀法的试验条件对推进剂相对交联密度的影响。结果表明,用溶胀法测量NEPE推进剂的相对交联密度具有较好的重复性,以甲苯为溶剂,在25℃溶胀48h以上测得推进剂的相对交联密度（ve）和相对交联点间的相对平均分子质量分别为0.5832×10^-4-0.5899×10^-4mol/cm^3和4027-4074 g/mol;用溶胀法测量的少烟NEPE推进剂的交联网络结构参数（G、ve和Mc等）与推进剂力学性能（E、σm、εm、εb等）的变化一致。

The suitable experimental conditions for the swelling test to determine the cross-link density of NEPE propellant were studied to analyze the relations between the cross link network and the mechanical properties of the propellant. It is found that the relative cross link densities （ve） and the relative molecular weights between the cross-links （M^-c） of the NEPE propellant are in the range of 0. 583 2 × 10^-4 mol/cm^3 to 0. 589 9 × 10^- 4 mol/cm^3 and 4074g/mol to 4046g/mol, respectively, when swelling the sample in toluene for longer than 48h at 25℃, showing that the value of ve for NEPE propellant determined by the swelling method had a better repeatability. The changes of the cross-link network parameters （G, ve and M^-c） obtained by the swelling method are in accord with the changes of the mechanical properties （E,σm, εm,εb） of the propellant.