Synthesis And Study Infrared-laser Of Polya-naphthylamine Stealth Composite Materials

Diversity functional composite had been given rise to widespread concern in the field of contemporary material. Conductive polymers and nanomaterials which had good optical and electrical characteristics had been widely applied in the study of functional composite materials preparation. In this paper, infrared-laser compatible stealth composite materials were prepared by using conductive polymer as the continuous phase and nano-materials as filler.Conductive poly-α-naphthylamine [P(α-NPA)] which used α-naphthylamine, dodecylbenzene sulfonic acid and ammonium per-sulfate as comonomer, mulsifier and initiator, respectively, was synthesized by emulsion polymerization. The polymer structure and electro-optical properties were analyzed by FT-IR spectra, UV-vis absorption spectra, IR-2dual-wave emissivity measuring instrument and four-probe resistance tester. The results showed the optimized experimental condition as follows:the amount of substance ratio of dodecylbenzenzsulfonic, ammonium per-sulfate and α-naphthylamine was1.5:0.4:1, and the reaction time was16h with the reaction temperature staying at5℃. In this condition, the productivity of polymer was70.3%, and its conductivity was5.78×10-2S/cm. Meanwhile the lowest infrared emissivity was0.81in8～14μm band.Selected chromium trichloride, tin tetrachloride, aluminum flake and ammonia as the main materials, it was used the method of hydrothermal hydroxide precipitate to prepare the precursor pigment powder, and then the nano-scale pigment powder could be obtained by calcinations. The pigment powder exothermic structure and optical properties were characterized trough scanning electron microscopy, X-ray diffraction, IR-2dual-wave emissivity measuring instrumentand, tunable lasers for carbon dioxide at10.6μm. It showed that the reaction system was stabilized when m(Al):m(CrCl3.6H2O):m(SnCl4.5H2O) was1:1.2:0.5, and the amount of citric acid, which was selected as dispersing agent through ultrasonic dispersion, was8%to aluminum powder. Moreover the reaction time was4hours when the temperature was50℃,and the range of the value of pH was8. Under this condition, flake aluminum was coated more completely, and the nano-pigment prepared had lower infrared emissivity and better anti laser reflection performance.Poly-α-naphthylamine nano-composite was prepared using nano-pigment powder as fillerand poly-α-naphthylamine as continuum by ultrasonic emulsion polymerization. The infrared emissivity of nano-composite membrane at8～14μwas analyzed by infrared emissivity measuring instrument, and it was used tunable lasers for carbon dioxide to measured the laser reflection performance at10.6μm, and the micro morphology was studied by scanning electron microscopy. The results showed that with the amount of pigment power increasing the infrared emissivity at8～14μm and the laser reflection performance at10.6μm of nano-composite were decreased firstly, and then increased slowly. When the addition amount of pigment power was20%, the infrared emission of the material could be reduced to0.61, the laser reflecting energy was reduced to0.91%.Moreover the nano-composite material achieved the requirements of the IR-Laser compatible stealth.