HIgh-temperature electrical conductivity and thermal decomposition of Sylgard 184 and 184/GMB
These properties were determined to 600 to 700/sup 0/C in air and nitrogen environments. The material is a silicone-based dielectric and is used as an encapsulant for electronic components. The 184/GMB material contains glass microballoons. The thermal decomposition characteristics were determined from mass loss and vaporization species (mass spectroscopy) measurements. Results show only minor weight loss in air up to 300/sup 0/C and in nitrogen to 400/sup 0/C. There is a peak in the conductivity at approx. 300/sup 0/C which results from the volatilization of (Si (CH/sub 3/))/sub n/ with some dehydration. At and above 400/sup 0/C, weight loss is much more pronounced and the conductivity is dependent upon the atmosphere and upon the presence of glass microballoons. The conductivity characteristics in air are similar to those in nitrogen, except there is a peak in air at 490 to 530/sup 0/C due to combustion and there is a shift to lower temperatures. This indicates that the oxygen accelerates decomposition. 184/GMB exhibits an enhanced conductivity above approx. 500/sup 0/C. Similar results are observed for materials with islica microballoons (184/GMB-S) and ceramic microballoons (184/CMB). This suggests that the microballons may help form a network of interconnected conductive pathways in the residual material. The material without microballoons is highly fractured. 18 figures, 5 tables.
- Research Organization:
- Sandia National Labs., Albuquerque, NM (USA)
- DOE Contract Number:
- AC04-76DP00789
- OSTI ID:
- 6463448
- Report Number(s):
- SAND-82-1283; ON: DE83005810
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
COMPOSITE MATERIALS
ELECTRIC CONDUCTIVITY
PYROLYSIS
SILICONES
AIR
ELECTRONIC EQUIPMENT
ENCAPSULATION
EXPERIMENTAL DATA
GLASS
HIGH TEMPERATURE
LOSSES
MICROSPHERES
NITROGEN
TEMPERATURE DEPENDENCE
WEIGHT
CHEMICAL REACTIONS
DATA
DECOMPOSITION
ELECTRICAL PROPERTIES
ELEMENTS
EQUIPMENT
FLUIDS
GASES
INFORMATION
MATERIALS
NONMETALS
NUMERICAL DATA
PHYSICAL PROPERTIES
POLYMERS
SILOXANES
THERMOCHEMICAL PROCESSES
360405* - Materials- Polymers & Plastics- Degradation & Erosion- (-1987)
360404 - Materials- Polymers & Plastics- Physical Properties- (-1987)