In case you are wondering this is the summary of a study on the wood.
In this work, the modification of fast-growing poplar using vacuum heat treatment was studied, and the changes in physical properties, mechanical properties, and corrosion resistance were analyzed.
From this study, it can be concluded that the color of poplar’s surface became deeper with higher treatment temperatures. The dimensional stability of heat-treated wood increased with increasing temperature and time. The mechanical properties of treated wood decreased, and the corrosion resistance of untreated poplar was weaker than heat-treated poplar. The corrosion resistance of treated poplar improved with increasing temperature and time.
The vacuum heat treatment improved the dimensional stability and durability of poplar but reduced its mechanical strength. Because of this, further improvements in the mechanical strength of poplar are needed.
https://bioresources.cnr.ncsu.edu/resources/effects-of-heat-treatment-under-vacuum-on-properties-of-poplar/