Effect of antioxidant 1010 on properties of polyoxymethylene

Antioxidant 1010 and copolyamides（COPA）were used as large molecules free radical scavenger and formaldehyde absorbents for polyoxymethylene（POM）respectively，to investigate the ultraviolet（UV）aging properties of the blend. The effect of different compositions on mechanical properties and microstructure of POM was studied. Analysis with polarized light microscopy（PLM）and differential scanning calorimetry（DSC）showed crystallizing nucleation effects of antioxidant and COPA on POM. The contents of both antioxidant and COPA of 0.5% gave the best performance of UV aging. Mechanical properties were also excellent. TGA results showed that decomposition temperature of the blend was higher. The blend presented typical non-Newtonian fluid behavior，and when antioxidant contents was less than 0.5%，its complex viscosity was higher than POM. After UV ageing，the complex viscosity of the blend was also higher than POM.