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 | Effect of Triethanolamine and Benzaldehyde on the Storage Stability of Polystyrene Ammonium Perchlorate Propellant
Author : Kishore, K.;Gayathri, V.;Dharumaraj, G.V.
Source : Defence Science Journal ; Vol:36(4) ; 1986 ; pp 381-387
Subject : 66 Chemical Technology;662.3 Propellants
Keywords : Dynamic thermogravimetry;Ambient temperature;Ballistic stability
Abstract : The effect of triethanolamine and benzaldehyde on the stability of polystyrene has been studied by dynamic thermogravimetry (TG). Slower decomposition of polymer in the presence of these compounds indicates their inhibiting ability on the oxidation of the polymer. The burning rate measurements of polystyrene (PS)/ammonium perchlorate (AP) propellants at ambient temperature and pressure shows an increase with the storage time. The percentage change in the burning rate of the propellants containing aldehyde and amine is less during the ageing which indicates the increased stability of the propellants. The safe-life time of the propellants for the ballistic stability has been calculated from the activation energy for the ageing process using an Arrhenius type equation. The safe-life of the propellants containing triethanolamine and benzaldehyde is more than the neat propellant. |
| | Preliminary Studies on Subsoil Temperatures at Jodhpur
Author : Mokhashi, B.G. ;Sharma, G.S.;Kaushik, S.B.
Source : Defence Science Journal ; Vol:15(1) ; 1965 ; pp 30-35
Subject : 631.4 Soil Science
Keywords : Ambient Temperature ;Wave;Diurnal Temperature;Jodhpur
Abstract : Diurnal temperature profiles of Jodhpur soil in relation to depth on a few selected days of four different months have been presented. Thermal diffusivity of the soil has been estimated by three different methods and the values, obtained by one of these methods, have been utilized for evaluating the depth of penetration of diurnal temperature wave, which is found to be 50.1 cm on the average. Certain other aspects of surface temperature in relation to ambient temperature, have been discussed. |
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