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Untitled - Sciencemadness Dot Org

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HMX<br />

5. THERMAL PROPERTIES<br />

46<br />

5.1 Phase Changes.6-8<br />

Latent Heat<br />

‘be<br />

Temperaturea<br />

w W/d (kcal/mole)<br />

Solid-to-solid<br />

Bba<br />

atoy<br />

ato6<br />

Solid-to-liquid<br />

a*<br />

;<br />

Solid-to-gas<br />

102-104<br />

Metastable<br />

160-164<br />

2.0 0.6<br />

--_ ___<br />

7.8 2.3<br />

256-257 _-_ --_<br />

246-247 50.0 17.0<br />

279-280 _-_ __-<br />

280-281 --_ ---<br />

--- 141.4 41.8gb<br />

---------<br />

“There is some controversy about the temperature stability ranges of the four HMX<br />

polymorphs. These data are from Ref. 8.<br />

Vomputed from the vapor pressure data presented in Sec. 5.2.<br />

5.2 Vapor Pressure.B<br />

A least squares fit to these data gives<br />

Temperature Vapor Pressure<br />

(“(2<br />

(mm Hg x 10’)<br />

97.6 0.032<br />

108.2 0.164<br />

115.6 0.385-0.419<br />

129.3 2.830-2.870<br />

log,, P(mm Hg) = 16.18 - 41 890/4.576 T(K) .<br />

r

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