合成酸化防止剤の熱安定性
1994 年 43 巻 11 号 p. 1022-1026
詳細
1994 年 43 巻 11 号 p. 1022-1026
By programmed thermogravimetry (TG), weight loss of 8 synthetic antioxidants was examined, and thermostability was determined from initial temperatures based on TG and decomposition time at 5 % by isothermal TG. Antioxidant content in residual substances was determined at 25 % weight loss by TG. The results obtained are summarized as follow :
1) For programmed TG, curves for synthetic antioxidants showed characteristic weight loss patterns depending on the type of antioxidant. Weight loss patterns were not influenced by atmospheric gas used (air and nitrogen).
2) At 25 % weight loss by TG, phenolic antioxidant content in residual sabustances exceeded 90 % in both gases. Gallate content was less than that observed for phenolicis.
3) Synthetic antioxidant thermostability increased in the order of NDGA>DG>OG>PG>THBP>TBHQ>BHA>BHT as determined from TG data.
