超支化聚氨酯在HTPB推进剂中的应用研究

为改善丁羟复合固体推进剂（HTPB推进剂）的性能，选用超支化聚氨酯（HBPU）作为HTPB推进剂的助黏合剂，制备了含有超支化聚氨酯的HTPB推进剂. 采用DSC法研究了HBPU与HTPB推进剂主要组分的相容性，同时进行了HBPU对HTPB推进剂流变性能和力学性能的影响研究. 研究结果表明，HBPU与AP、HTPB相容性好；HTPB推进剂表观黏度随着HBPU的质量分数增加而增大；当HBPU质量分数为7%时，超支化聚氨酯改性的HTPB推进剂最大拉伸强度提高了24.17%，最大延伸率提高了22.84%. 

Study on Application of Hyperbranched Polyurethane in HTPB Propellant

In order to improve the properties of HTPB propellant, HTPB propellants with hyperbranched polyurethanes were prepared by using hyperbranched polyurethane (HBPU) as assistant binder. The compatibility of HBPU with main components of HTPB propellant was studied by using DSC method, and the influence of mechanical properties and rheology behaviors of HBPU on HTPB propellant were also investigated. The results show that the compatibility between HBPU and AP, HTPB is good. The apparent viscosity of HTPB propellant slurry increases with the increment of HBPU content. The maximum tensile strength and maximum elongation of HTPB propellant with 7% HBPU in total binder weight are raised 24.17% and 22.84% and compared with the blank HTPB propellant, respectively.