Effects of Thymolphthalein on Thermo-oxidative Stabilities of HDPE

Effects of 3,3-bis(4-hydroxy-2-methyl-5-propan-2-ylphenyl)-2-benzofuran-1-one (thymolphthalein) on thermooxidative stabilities of HDPE in both melt and solid states was investigated using differential scanning calorimetry (DSC) and Fourier transform infrared (FTIR) spectroscopy, respectively. It was shown that thymolphthalein modifies the thermo-oxidative stabilities of the polymer in both solid and melt states. Its efficiency in thermo-oxidative stabilization of HDPE is comparable to that of Irganox 1010, a commercially used antioxidant for polyethylene. There is a proportional relationship between the stabilization effect of thymolphthalein and its concentration in the polymer. On the basis of the obtained results, the thermo-oxidative stabilizing activity of thymolphthalein was described in terms of the activity of phenolic and allylic hydrogens present in the molecular structure of thymolphthalein.

کلیدواژه ها:

polyethylene ، Thymolphthalein ، Thermal oxidation ، Thermo-oxidative stability ، antioxidant