Effect of Carbon Nanotubes on the Microstructure and Thermal Property of Phenolic/Graphite Composite

Table 3

Apparent density and open porosity values of composites before and after pyrolysis.

Number	Composite		Apparent density (g/cm^3; ±0.01)	Open porosity (%; ±1)
1	G/P	Before pyrolysis	1.94	—
		After pyrolysis	1.82	16
2	G-CF/P	Before pyrolysis	1.86	—
		After pyrolysis	1.74	15
3	CNT-CF-G/P	Before pyrolysis	1.85	—
		After pyrolysis	1.71	10