Investigation of the pore structure in glass-like carbon prepared from furan resin

Small-angle X-ray scattering (SAXS) measurements were carried out on glass-like carbons (GCs) prepared from furan resin at 950°C and thereafter treated at various temperatures. The scattering intensities grow gradually with increasing heat-treatment temperature (HTT) up to 1600–1800°C, and then the intensities increase abruptly at HTT higher than 1800°C. HTT dependence of the reciprocal width for the 002 peaks shows a similar behavior. Distance distribution functions (DDFs) were obtained by the Fourier transform of the SAXS intensities, from which the changes of the gyration radius and the shape of pores in the GC with increase of HTT are discussed. The HTT dependence of the structural change of the GCs from furan resin is almost the same as that of GCs from phenolic resin. However, it was found that the GC prepared at 1200°C from furan resin shows a peculiar behavior, namely, the largest interlayer spacing in the carbon matrix and the smallest value of the gyration radius for pores.