RESUMEN
Objective To develop a nonaqueous electrolyte electrochemical detector in order to solve the problems of shorter average life span and operating temperature range in aqueous electrolyte electrochemical detector for unsymmetrical dimethyl hydrazine(UDMH).Methods Nonaqueous electrolyte was utilized in this kind of electrochemical detector comprised of n-mehyl-2-pyrrolidone with conductive compatible salts,such as tetrabutyl ammonium tetrafluoroborate,which had much lower evaporating pressure and freezing point than aqueous electrolyte ones.Three-electrode potential electrochemical system was also used,composing a sensing electrode,a counter electrode and a reference electrode.The three electrodes were all teflon-bonded diffusion electrodes which were prepared by spraying the noble metal catalyst dispersion onto the Teflon film.Results The experiment result showed that the average life span could be over two years compared with the aqueous electrolyte electrochemical detector of one year life span.Operating temperature range was expanded to-20 ℃～+40 ℃.However,the response time was nearly five minutes.Conclusion The detector can be used for leakage checking in the places where a large quantities of UDMH are used or stored.
RESUMEN
The experiment method of "Liquid-vapor" permeation for nitro oxidizer's skin protective materials by the indicator of pH test paper is developed,and the method for cankerous testing and evalution roles are confirmed too.The result of the experiment shows that butyl rubber and halogenated butyl rubber have better protective performances for "liquid-vapor" permeation of nitro oxidizer,while fluorine rubber,polyethylene and polyterafluoroethylene have better cankerous protection capabilities.
RESUMEN
Objective To explore the method of permeability for skin protective materials of rocket propellant based on the design and make of sealing container. Methods The propellant mass permeated per minute and per square centimeter was calculated by testing the mass through the sample at the fixed time in the sealing container. Results The method of permeability for skin protective materials against rocket propellant was developed by the mass variation of propellant in the sealing container. The limits of 100?g /(cm2?min) was raised to assess if the material had the protection ability. In the meantime, the reliability of material protection behavior was improved. Conclusion The science of the method developed is confirmed by comparing the permeation performance of protection materials at home and abroad, and the method can be the basis to assess the ability of protection materials.