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نشریه دانشکده فنی | ||
Article 7, Volume 34, Issue 2 - Serial Number 1149, August 2000 PDF (428.7 K) | ||
Abstract | ||
The kinetics of reaction between HTPB (Hydroxyl Terminated Polybutadiene) and TDI (Toluene Diisocyanate) bas been investigated. Back procedure is used for determination of extent of reaction. In this procedure the additives will not disturb the experiments. The reaction was only investigated up to gel point, because of unreproducibility for postgel samples. The extent of reaction was measured at four different temperatures for polymeric binder and the constants of apparent second order rate equation were obtained. Because of different situation of isocyanate groups in TDI a break appears in the said quadratic curves. Also cure ratio parameter (R or equivalent ratio of NCD to OH) was varied, but the effect of variation of this ratio on the rate of reaction was not very much sensible (R was varied from 0.84 to 0.95). Finally the effect of Ammonium perchlorate was studied. It is found that as the extent of this additive is increased, its reducing effect of reaction rate wi)) increase, and as Ammonium perchlorate sizing becomes larger the rate of reaction will decrease. | ||
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