Modified phenolic resin was prepared using thermal prepolymerization between barium-phenolic resin
and modifier. The cured modified phenolic resin with regular size and shape was prepared using the technology of
compress moding, and then, it was carbonized at the temperature of 400℃ and 700℃ to prepare the carbonized samples,
which was used to measure density, weight loss, and shrinkage ratio. The influence of modifier on the morphology,
surface area, thermal insulation properties and compression strength was also studied. The results of scanning electron
microscope (SEM) showed that after calcinations at 700℃, the “ coral-like ” carbon structure was observed
with the nanopores in a range of between 30 to150 nm and a relatively high brunauer-emmett-teller (BET) surface area
of 464 m2 / g. Compared to the carbonized sample from unmodified phenolic resin, the test of insulation properties
and mechanical properties showed that the thermal conductivity of modified phenolic resin was reduced by 45． 57%,
but still retained good compression strength.