Interfacial bonding between RDX and bonding agents

The interfacial bonding between a series of bonding agents (including polyhydroxy alcohols bonding agents (LBA-22, LBA-201), hyantoin/triazines composite bonding agents (CBA), neutral polymeric bonding agents(NPBA) and substituted amides(LTAIC)) and RDX were studied. Meanwhile, all of the bonding agents were used to prepare RDX-CMDB propellants. The surface and interface parameters were measured by the contact angle method and Wilhelmy plat method, and adhesive work was calculated based on the harmonic-mean equation. Results show that the value of contact angle (θ) between CBA and RDX is 35.2°, and the value of adhesive work (W_a) is 135.01 mN/m. In FTIR spectra, (-NO₂) group absorption peak has a 22 cm^-1 red shift to 1510 cm^-1 and the absorption band becomes wide. The mechanical properties of CMDB propellant with coated RDX are significantly improved. The value of σ_m is increased from 1.02 MPa to 2.01 MPa at high temperature (50°C) and the value of ε_m is increased by 140% at low temperature (-40°C). The surface and interface parameters of different bonding agents basically correspond with the mechanical properties improvement of CMDB propellants.