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Untitled - Sciencemadness Dot Org

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5.5 Coefficient of Thermal Expansion.<br />

Density<br />

k/cm”)<br />

Coefficient of<br />

Expansion<br />

w C)<br />

Temperature<br />

Range<br />

(OC)<br />

1.840 4.7 x 10-s 25 < T < 70<br />

5.6 Heats of Combustion and Formation.<br />

Constituent<br />

mz<br />

(kcal/mole)<br />

AH;<br />

(kcal/mole)<br />

HMX -660.7 11.3<br />

NC --- -200<br />

CEF --- -300.0<br />

5.7 Thermal Decomposition Kinetics.6<br />

Constituent<br />

Property PBX 9404a HMX<br />

Decomposition energy<br />

Activation energy<br />

Pre-exponential factor<br />

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

“Reflects NC decomposition.<br />

5.8 Other Thermal Stability Test Rksults.<br />

Vacuum<br />

__-<br />

31.3 kcal/mole<br />

4.3 x lo’z/s<br />

Test Results<br />

DTA and pyrolysis<br />

500 Cal/g<br />

52.7 kcal/mole<br />

5 x 1o’S/s<br />

1~3-4.0 ml/g of gas evolved<br />

after 48 hat 120°C<br />

See Fig. 2<br />

PBX 9404<br />

89

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