Abstract
Conventional plasticizers deteriorate mechanical and viscoelastic properties of the propellants due to their migration upon aging and long-term storage,which affects reliability and safety properties during exploitation.To address this issue,conventional plasticizer,dioctyl adipate(DOA),is replaced by reactive one,castor oil(CO).In addition,three different types of HTPB were used to obtain propellants with designed viscoelastic and mechanical properties.The CO increased propellants viscosity,without a sig-nificant impact on the propellant processability,regardless to the type of prepolymer.Conversely,me-chanical properties were different depending on the type of resin,which were further analyzed by gel permeation chromatography(GPC).Addition of CO formed a denser polymer network and shifted Tg to higher values,compared to the compositions with DOA.The tensile strength of CO-containing pro-pellants was lower at+20 ℃ and+50 ℃ compared to the reference compositions,while the strain at maximum load and strain at break were significantly increased with pronounced plastic deformation,especially for samples at-30 ℃.The inclusion of CO in the propellants composition gives more room for adjusting a wide range of mechanical properties.
基金项目
this research from the Serbian Ministry of Education,Science and Technological Development(451-03-68/2023-14/200325)
Ministry of Defense(VA-TT/1/22-24)
维普
万方数据