Posted: Mar 10, 2017 4:18 pm
Here's my layperson's guess: without an atmosphere of oxygen, the stuff that makes up wood will either melt or react with the other stuff, depending on the chemistry. Eventually, everything will break apart into gas and, eventually, plasma.
ETA
Aaaand... I found something on Reddit:
https://www.reddit.com/r/askscience/com ... _a_vacuum/
ETA
You may end up with charcoal.
ETA
Aaaand... I found something on Reddit:
Heating a complex composite (a mixture of different materials) like wood will cause the components to either melt individually, react or decompose. The polymers that make up wood (cellulose, hemocellulose and lignin mainly) are made up of sugar or lignol units that contain oxygen... excessive heat will cause these units to decompose to form their most stable configurations: singular, gaseous molecules like CO2 and H2O, or simple elemental deposits like carbon will form, their ratio dictated by the ratio of the elements in the wood itself.
https://www.reddit.com/r/askscience/com ... _a_vacuum/
ETA
You may end up with charcoal.