Effect of Microphase Separation Conditions in a Resol Resin/Ethylene Glycol System on the Properties of Its Pyrolysates

摘要

We have studied the effect of polymerization-induced phase separation (PIPS) step conditions in a resol phenol-formaldehyde resin-ethylene glycol system on the physicochemical properties of carbon samples obtained after post-curing and pyrolysis. The results demonstrate that raising the PIPS step temperature leads to a decrease in macropore size and increase in the total mesopore volume. Pyrolysis of cured samples obtained at a PIPS step duration shorter than or equal to the gelation time leads to a "collapse" of the pore structure formed in the microphase separation step. Pyrolysis of cured samples after a PIPS step whose duration considerably exceeds the gelation time leads to shrinkage of the samples, without changes in their density or pore structure. PIPS step conditions have an insignificant effect on the structure of the carbon skeleton, which consists of X-ray amorphous carbon containing crystalline graphite inclusions.