Burning solids Flashcards
pyrolysis of wood
thermal decomposition to produce lower molecular mass compounds with out oxygen
because wood = cellulose it burns easily
thermoplastics
- linear chains, reversible melting
- melts before it ignites and can be spread by burning droplets/ pools
thermoset
-cross link structure, does not melt
- decomposes and leaves char, burns like wood
thermoset decomp - end chain scission
removes monomer from end of backbone
thermoset decomp - random scission
main chain broken at random points until small sections are made
thermoset decomp - chain stripping
back bone intact but molecules not part of the main chain break away
thermoset decomp - crosslinking
more crosslinking added - generates char
burning metals
Al- can burn but is rare
Mg- burns with a bright white flame; not extinguished by water