Synthesis And Application Of A New-style Reinforced And Low Burning Rate Dual Functional Additives In HTPB Propellant

HTPB composite propellant has been widely used because of its excellentcomprehensive performance. With the development of the times, some new rocketpropulsion agent requires good mechanical strength. Along with relatively lowburning rate, conventional bonding agent and deceleration agent can not meet theirrequirement. Basing on the high-strength, low burning rate performance requirementsof hydroxy-terminated polybutadiene(HTPB) propellant, a new-style reinforced andlow burning rate dual functional additives was designed and synthesized.Thesynthetic target compounds were used to study the influence of additive to mechanicalproperties of the propellant substrate through stretching mechanics, swellingperformance testing,and the thermal decomposition of AP with the way of thermalgravimetric analysis and differential scanning analysis.The subjects of the study is HTPB composite propellant,selecting acrylic ac id(AA), hydroxyethyl acrylate (HEA), butyl acrylate (BA) as monomer,azobisisobutyronitrile (AIBN) as initiator, β-mercaptoethanol (β-ME) as chaintransfer agent, acetone as a solvent solution for radical solution copolymerization toobtain the acrylic terpolymer, followed by using triethylamine (TEA) to totally full, inorder to obtain new polyacrylic acid polyester ammonium compounds. Theirstructures were characterized, proving the target compounds have been synthesized.Based on the molecular weight value, hydroxyl value, amine and the solubilityparameter, to determine the optimal feeding formula ratio is acrylic acid, hydroxyethyl acrylate, butyl acrylate=4:1:8(molar ratio).Synthesized target compounds, through the tensile, swelling performance te sting,affect on HTPB propellant mechanical properties. The results show that the additivecan obviously improve the crosslink density of the propellant base, so as to improvethe physical properties of the propellant base.By thermogravimetric (TG) and differential scanning analysis discusses thetarget compounds influencing on the thermal analysis of AP.The results showsdecomposition temperature of AP additives can reach to380℃, inhibit AP thermaldecomposition,can achieve the result of reducing the propellant burning rate.