The phenolic resins (PR) was reinforced with carbon nanotubes (CNTs) to improve its electrical, thermal and mechanical properties with CNTs in different contents. The results indicate that by adding multi wall carbon nanotubes (MWNTs) up to 10% in weight, the thermal conductivity of the nanocomposites can increase from 0.612 to 1.473 Wrn-1 K-1 while the electric conductivity increase significantly from 0 to 135.52 ms. In order to further disperse the MWNTs in PR, two different methods to modify MWNTs, such as carboxyl MWNTs (c- MWNTs) and surfactant (sodium dodecyl sulfate, or SDS) modified MWNTs (SDS-MWNTs), were adopted. The transmission electron microscopy (TEM) images reveal that the length of the c-MWNT becomes much shorter, while the length of SDS-MWNT has no significant change. Measurements by ultraviolet-visible (UV-vis) spectrophotometer indicate that for MWNT s dispersion in alcohol the absorption spectrum of c-MWNTs dispersion is much higher than both the SDS-MWNTs and the as-grown MWNTs dispersion. In addition, with better dispersion of SDS-MWNTs in PR, both the electrical and the thermal conductivity of SDS-MWNT/PR nanocomposites are found higher. However, the lower thermal conductivity of c-MWNTs/PR composites may be attributed to shortening of the MWNTs by the attack of acidic treatment.
All Science Journal Classification (ASJC) codes
- Physics and Astronomy(all)