Mesoscopic Dynamic Simulations on the Phase Structure of Nitrocellulose/Plasticizers Blends

The phase structures and their evolution processes and affecting factors of blend systems of plasticizers nitroglycerine (NG), 1, 5-diazido-3-nitrazapentane (DIANP), N-butyl nitroxyethyl nitramine (Bu-NENA), bis(2, 2-dinitropropyl) formal (BDNPF)/bis (2, 2-dinitropropyl) formal acetal (BDNPA) (designated as BDNPF/A when the mass ratio of BDNPF/BDNPA is 1∶1) and nitrocellulose (NC) respectively were compared and studied by using a mesoscopic dynamics simulation method. The micromorphology of miscible products of four kinds of blend systems with the mass ratio of NC and plasticizer as 50/50 was compared and studied using scanning electron microscope. The results show that compared with plasticizer NG, the plasticizers DIANP, Bu-NENA and BDNPF/A exhibit better miscibility with NC, and their micromorphology characteristics are in good agreement with the mesoscopic dynamics simulation results. At 20℃, the phase separation for NC/BDNPA/F blend system with the mass ratio as 30/70 and NC/NG blend systems with the mass ratio as 70/30, 60/40, 50/50, 40/60 and 30/70 occurs. For the NC/NG blend system with the mass ratio as 50/50, the miscibility of NG and NC improves with increasing the temperature, and the phase separation phenomenon of the system disappeared at more than 40℃.