改質ポリ塩化ビニルとポリカーボネートの計装化シャルピー衝撃特性の比較 A Comparison between Instrumented Charpy Impact Properties of Reformed Polyvinyl Chloride and Polycarbonate

Polyvinyl chloride which is reformed for impact resistance (Hi-PVC) and polycarbonate (PC) which has excellent impact resistance properties are tested by using an instrumented Charpy impact tester. Effects of temperature and notch root radius on the specific absorbed energy, the maximum load and the fractographs are studied. It is found that the specific absorbed energy of the Hi-PVC specimen does not relate to the notch root radius below 0℃ and the value is lower, but it increases rapidly at 20℃. The Hi-PVC specimen represents the brittle fracture similar to the PVC specimen below 0℃. The PC specimen initiates many microvoids at the notch surface as the notch root radius is larger above 0℃. Similarly, the Hi-PVC specimen initiates the trend which has many microvoids due to the rubber particles at the notch tip at 20℃.