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PBX 9011<br />

76<br />

5.5 Coefficient of Thermal Expansion.<br />

Density Coefficient of Expansion<br />

(s/cm*) (WC)<br />

1.752 22.2 x 1o-e<br />

5.6 Heats of Combustion and Formation.<br />

AH;<br />

Constituent (kcal/mole)<br />

HMX -660.7<br />

5.7 Thermal Decomposition Kinetics.4<br />

Property<br />

Temperature Range<br />

(“C)<br />

AH;<br />

(kcal/mole)<br />

25 < T < 74<br />

11.3<br />

Decomposition energy 500 Cal/g<br />

Activation energy 52.7 kcal/mole<br />

Pre-exponential factor 5 x 10%<br />

5.8 Other Thermal Stability Test Results.<br />

Vacuum<br />

Test Results<br />

DTA and pyrolysis<br />

0.3-0.9 ml/g of gas evolved<br />

after 48 h at 120°C<br />

See Fig. 2

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