Radiation effects on polypropylene for sterilization.
In order to improve the resistance of gamma-radiation sterilization of polypropylene (PP), the formulations of the additives such as antioxidants, crosslinking agent, and trans-stilbene oxide (StO) have been carried out. The irradiated PP and ethylene-propylene copolymer samples with control and additives were characterized by mechanical tester, colorimetry, and Fourier transform infrared spectroscopy with total attenuated reflectance mode (FTIR-ATR). Crosslinking agent and StO formulated PP showed remarkable radiation resistance and minimum discoloration. Also, radiation resistance of ethylene-propylene copolymers with 3% of ethylene contents was better than that of PP homopolymers in the case of no additives. The proposed mechanisms of radiation stabilization with additives are also discussed.
Khang
G
G
Biomaterials Laboratory, Korea Research Institutes of Chemical Technology, Taejon, Korea.
Lee
H B
HB
Park
J B
JB
D000975:Antioxidants / Q000737:chemistry; D003432:Cross-Linking Reagents / Q000737:chemistry; D005720:Gamma Rays; D008422:Materials Testing; D011126:Polypropylenes / Q000528:radiation effects*; D011829:Radiation Dosage; D017550:Spectroscopy, Fourier Transform Infrared; D013242:Sterilization / Q000379:methods*; D013267:Stilbenes / Q000737:chemistry
D000975:Antioxidants; D003432:Cross-Linking Reagents; D011126:Polypropylenes; D013267:Stilbenes; C025906:stilbene oxide