We talked about it in our chemistry class but we couldn't get to a conclusion, any help?
NO, we can't melt wood!
From primary level we have learned that solid melts to liquid at certain temperature and on increasing the temperature further it change into gaseous. But that is not the case always.
The problem with melting wood revolves around what combustion is, and what temperature the combustion of wood happens at. Combustion, also known as burning, is simply a chemical reaction that takes place where the combustible material (in this case wood) in the presence of an oxidizer (usually the air around the fire) changes its chemical composition and decomposes the material into other chemicals. The process is one that’s exothermic. As such, light and heat can be released.
Wood is mostly made up of things like cellulose, lignin, and water. As wood combusts, it’s broken down into products like charcoal, water, methanol, and carbon dioxide. Unlike water turning back into ice, if you cooled down the resulting products of burning wood, it obviously does not change back to its original composition.
All materials that combust will have a natural temperature at which the process will begin taking place. The higher the temperature, the quicker the process becomes (usually). If that temperature is lower than the temperature at which the material will melt, that material will never (naturally) melt because it just turns into other chemicals.
As for wood, it will begin a process known as pyrolysis at temperatures around 500-600 degrees Fahrenheit. Pyrolysis is also an exothermic reaction that tends to be self sustaining. At these temperatures, wood will begin giving off up to 100 chemicals, including methane and methanol (the same stuff they put as additives in gasoline), that will begin to burn. Once those chemicals begin burning, they will increase the temperature and the remaining char (the burned black bits present after the fire goes out) left behind will begin to further decompose, things like calcium, potassium and magnesium.
Theoretically, it may be possible, but hasn't been proven.
According to this article, wood cannot even be melted in a vacuum, but may be able to melt under high pressure.