Kinetics of Curing Reaction of Novolak-type Phenol Formaldehyde Resin from Phenolated Wood

The curing behaviors and kinetics of novolak-type phenolic resin from phenolated wood(PWF) were investigated with DSC.Thermal degradation properties and structure of cured PWF were analyzed by means of TG and FTIR,respectively.The curing reaction of PWF was compared with that of traditional novolak-type phenol formaldehyde resin(PF).The results showed that the amount of curing agent——hexamethylene tetramine(HMTA) had great influence on curing of PWF.When the mass ratio of HMTA and resin was 100:10,apparent activation energy of curing reaction of PWF was 107.76 kJ/mol,which was lower than 141.35 kJ/mol of PF.There was little effect of curing agent content on the order of curing reaction of PWF,and the order of PWF curing reaction was constantly 0.95,the same as PF's.Curing temperature of PWF was from 135 to 137 ℃ by extrapolating Tp-β.TG curve of cured PWF followed the similar trend as that of cured PF during the range of 30 to 291 ℃.Both were thermal stable and had no weight loss before 200 ℃ and they began to loss weight with further increasing of temperature.The temperatures of thermal degradation of cured PWF and PF were 291 and 296 ℃,respectively.The structure of cured PWF was nearly similar to that of cured PF confirmed by IR.