Dynamic mechanical and thermal analysis of crystallinity development in Kel-F 800 and TATB/Kel-F 800 plastic bonded explosives: Part 1, Kel-F 800

Conference · Wed Jun 01 04:00:00 EDT 1988

OSTI ID:6932588

Hoffman, D M; Matthews, F M; Pruneda, C O

Dynamic mechanical and differential scanning calorimeter measurements were made on Kel-F 800, a copolymer of chlorotrifluoroethylene and vinylidene fluoride, as a function of time. Samples annealed over a 30-day period at 50/degree/C showed reduced relaxation strength in the glass-transition which directly correlated with the development of between 10 and 15% crystallinity in this polymer. Kel-F 800 samples were thermally cycled from /minus/54 to 74/degree/C without annealing for 12, 24, and 36 cycles developed only about half the crystallinity of annealed samples. Kel-F 800 which was annealed 30 days and subsequently subjected to the above thermal cycling retained almost all of the crystallinity which developed during the annealing process. These results indicate that Kel-F 800 copolymer crystallizes at an extremely slow rate, but as long as the thermal excursion remains below the major melting peak most of the crystallinity remains. 11 refs., 5 figs., 1 tab.

• Research Organization: Lawrence Livermore National Lab., CA (USA)
• DOE Contract Number: W-7405-ENG-48
• OSTI ID: 6932588
• Report Number(s): UCRL-98560-Pt.1; CONF-8810123-1-Pt.1; ON: DE88014154
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360602* -- Other Materials-- Structure & Phase Studies
45 MILITARY TECHNOLOGY, WEAPONRY, AND NATIONAL DEFENSE
450100 -- Military Technology
Weaponry
& National Defense-- Chemical Explosions & Explosives
AMORPHOUS STATE
ANNEALING
BINDERS
CHEMICAL EXPLOSIVES
CRYSTALLIZATION
ENTHALPY
EXPLOSIVES
FUSION HEAT
HEAT TREATMENTS
KEL-F
ORGANIC CHLORINE COMPOUNDS
ORGANIC COMPOUNDS
ORGANIC FLUORINE COMPOUNDS
ORGANIC HALOGEN COMPOUNDS
ORGANIC POLYMERS
PHASE TRANSFORMATIONS
PHYSICAL PROPERTIES
POLYETHYLENES
POLYMERS
POLYOLEFINS
TATB
THERMAL CYCLING
THERMODYNAMIC PROPERTIES
TRANSITION HEAT