化学交联网络对少烟NEPE推进剂力学性能的影响

Effect of Crosslink Network on Mechanical Properties of NEPE Propellant with Low Smoke

应用平衡溶胀法和动、静态力学性能测试方法研究了少烟NEPE推进剂的固化参数、增塑比和交联剂含量等因素对推进剂交联网络结构和力学性能的影响。结果表明,少烟NEPE推进剂的交联密度、初始模量和抗拉强度等在固化参数为1.5时达到最大,并随增塑比降低,交联剂(CA)含量增大而逐渐增大;推进剂的延伸率随固化参数和交联剂含量增大而逐渐降低,随增塑比增大而增大;推进剂的力学损耗随增塑比和交联剂含量增大而增大;但推进剂的玻璃化温度和次级转化温度随固化参数、增塑比和交联剂含量的变化不大(-33℃和-56℃)。

The effects of curing parameter （R） ,ratio of plasticizer to binder （ Pi/Po ） and crosslinker （CA） content on the crosslink network and mechanical properties of the NEPE propellant with low smoke were studied by the swelling experiment, uniaxial tensile and dynamic mechanical test （DMA）. Results show that the erosslink density （ve）, initial modulus （Eo） and maximum tensile strength （σm） of the propellant reach to the maximum, as the curing parameter （R） approaching to 1.5; the parameters （ve, Eo and σm） mentioned above increase with the decreasing of Pl/Po from 2. 8 to 2, 0 and with increasing of CA in the range of 0.00% - 0.10% , the maximum elongation （εm） and elongation at break （εb） of the propellant increase as Pl/Po increases （or R and CA decreases） ; the loss factors （tanδα and tanδβ） of the propellant increase with the increasing of Pl/Po and CA, while the glass and secondary transitional temperatures （ Tg and Tβ ） of the propellant, which are approximately - 33℃ and - 56 ℃, are slightly affected by R,Pl/Po and CA.