Effect of nano TiO2 on state of cure and pyrolytic reaction of phenol-formaldehyde resin

Phenol-formaldehyde resin is used as the most adhesive to produce waterproof plant-based composite. However, this product contains phenol and formaldehyde which can be easily released to pollute air. Based on the single-factor method, the effect of nano TiO ₂ on situation of cure and pyrolytic reaction of PF resin was studied by FT-IR and Py-GC/MS. The result of FT-IR spectrograms showed that the absorbencies of Ar-OH, Ar and Ar-O-Ar of PF/TiO ₂ composite were lower than that of PF, and there were no peaks of PF/ TiO ₂ composite at 820 cm ^-1 and 760 cm ^-1 , indicating that nano TiO ₂ couldn't improve the situation of cure of PF resin. There were components including carbon dioxide, D,.alpha.-tocopherol, 1,3-bis(trimethylsilyl) benzene, phenol from PF resin in 590degC He gas. However, the 20 compounds including phenol,2,4,6-trimethyl-, phenol, 2-methyl-, phenol, 2,4-dimethyl-, benzene,1,3-dimethyl-, 9-anthracenamine,9,10- dihydro-, phenol,2-ethyl-, benzene,1,2,3-trimethyl-, phenol were identified by Py-GC/MS after PF/TiO ₂ composite was pyrolyzed in 590degC He gas, and phenol and phenol derivants were found in the compounds. The result showed that nano TiO ₂ could effectively delay the pyrolysis of PF resin.