| 초록 |
Characteristics of polymers such as modulus, viscosity, density etc. are important factor in engineering design. However, most polymeric materials are easily oxidized by free radicals, and changes in their characteristics depend on degree of oxidation, which can lead to functional failure. Diverse studies have been conducted to reduce the oxidation of polymers, and most studies presuppose mixing stabilizers at the molecular level. In this study, we mixed polydimethylsiloxane (PDMS) with antioxidants, i.e., tannic acid, irganox1010 and naringenin in micron sized particle forms and investigated their characteristic changes after oxidation. During oxidation at 250 ℃ for 3 days, Young’s modulus of neat PDMS increased by 40 fold after oxidation, whereas PDMS containing 1 wt% of antioxidant increased under 3 fold after oxidation. FT-IR spectroscopy of PDMS containing antioxidant showed much smaller changes in their oxidation peak shifts compared to neat PDMS according to oxidation time. |
