Research On Micromolecule Deterrent Diffusion Behavior In Single Base Powder

In this study, the diffusion behavior of glycerol and a kind of small molecule deterrent named DBP(dibutyl phthalate) in single base powder and its main consistents nitrocellulose were researched by online IR. The diffusibility of deterrent in single base powder was invest-igated by the change of characteristic absorption wavelength in the solvent. The effects of temperature, time and deterrent structure and concentration were considered. Meanwhile the diffusion behavior of deterrent were stimulated using Material Studio and the diffusion coeffici -ent of deterrents were calculated. Thus, the diffusion mechanism was induced to infer the diffusion mechanism of deterrent in single base powder. Main conclusions were as follows:1. The nitrogen content, physical state and solubility of NC in the solvent effected the diffusion of deterrent. Mroe nitrogen content, incompact and higher solubility were favorable for diffusion of deterrent.2. Less amount of deterrent and higher temperature were beneficial to the diffusion of deterrent in NC. It showed that the deterring time range from 1h to 1.5h was favorable for deterrent to diffuse sufficiently.3. The diffusion behavior of DMP(dimethyl phthalate), DEP(diethyl phthalate), DBP, DOP(dioctyl phthalate) were studied by molecular simulation using Material Studio and the diffusion coefficient of deterrents were 20.307×10-10m2/s,38.265×10-10m2/s,9.577×10-10m2/s, 29.703×10-10m2/s.4. The effect between NG and NC was induced with the infrared spectrum results of NC, glycerol and deterrents mix process. The mechanism of NC and deterrent action was put forward to as following:there existed disssolvement and diffusion process between them and H-bond played major role in the diffusion step.