RESEARCH FOR HIGH TEMPERATURE ELASTOMERIC INSULATION MATERIALS
Abstract
The quantity of carbon-aceous residue formed by thermal decomposition of the rubber can be increased by using a supported Ni catalyst for part of the refractory normally used in an elastomeric insulating material. Ni metal catalysts are more effective in saturated rubbers than in diene rubbers. Initial decomposition products from a butyl rubber appear to be more susceptible to catalytic cracking than those from an ethylenepropylene rubber. In all cases, increased yields of carbonaceous residue were accompanied by increase in total quantity of H gas. Refractory support used for the Ni metal catalyst greatly influences activity of the catalyst and appears to affect the strength of the resulting char layer. Increasing C to C crosslinkages in an ethylene- propylene rubber does not increase the quantity of char. Thermal decomposition of 2 uncured commercial elastomeric insulating materials showed the rubbers employed yield a small amount of char. Calculations show that transpirational heating of H gas is the most important mechanism by which a thermally decomposing rubber can absorb heat in an ablating elastomeric insulating material. The heat sink effect of the C is the next most important mechanism.
Document Details
- Document Type
- Technical Report
- Publication Date
- Mar 15, 1963
- Accession Number
- AD0406932
Entities
People
- Anthony F. Wilde
- Joseph J. Byrne
Organizations
- Monsanto