Synthesis, characterization, thermal stability, and compatibility properties of poly(vinylp‐nitrobenzal acetal)‐g‐polyglycidylazides

Abstract

A series of energetic polymers, poly(vinyl p-nitrobenzal acetal)-g-polyglycidylazides (PVPNB-g-GAPs), are obtained via cross-linking reactions of poly(vinyl p-nitrobenzal acetal) (PVPNB) with four different molecular weights polyglycidylazides (GAPs) using toluene diisocyanate as cross-linking agent. The structures of the energetic polymers are characterized by ultraviolet visible spectra (UV-Vis), attenuated total reflectance-Fourier transform-infrared spectroscopy (ATR-FT-IR), 1 H nuclear magnetic resonance spectrometry ( 1 H NMR), and 13 C nuclear magnetic resonance spectrometry ( 13 C NMR). Differential scanning calorimetry (DSC) is applied to evaluate the glass-transition temperature of the polymers. DSC traces illustrate that PVPNB-g22 # GAP, PVPNB-g23 # GAP, and PVPNB-g24 # GAP have two distinct glass-transition temperatures, whereas PVPNB-g21 # GAP has one. Thermogravimetric analysis (TGA) and differential thermal analysis (DTA) are used to evaluate the thermal decomposition behavior of the four polymers and their compatibility with the main energetic components of TNT-based melt-cast explosives, such as cyclotetramethylene tetranitramine (HMX), cyclotrimethylene-trinitramine (RDX), triaminotrinitrobenzene (TATB), and 2,4,6-trinitrotoluene (TNT). The DTA and TGA curves obtained indicate that the polymers have excellent resistance to thermal decomposition up to 200 C. PVPNBg24 # GAP also exhibits good compatibility and could be safely used with TNT, HMX, and TATB but not with RDX.

Structure and mechanical properties of fluorine-containing glycidyl azide polymer-based energetic binders

“…It is well known that thermal stability is an important property for energetic materials and their additives . Hence, the thermal decomposition behaviors of FGAP and GAP were studied using DSC and TGA.…”

Effects of directed architecture in epoxy functionalized prepolymers for photocurable thin films

“…Synthesis via CRP has been used to form controlled structure block copolymers for a large variety of applications. [17][18][19][20] For example, simple modification of soft rubbery or hard glassy blocks of thermoplastic block copolymers allows significant control of thermomechanical properties. 21,22 By increasing the length of the low T g soft block, the polymer becomes much more flexible and impact resistant while with higher hard/ glassy block compositions, the material becomes much more stiff and brittle.…”