抄録
The effects of the degree of polymerization, stabilizer and reformer on the fatigue crack propagation of polyvinyl chloride were studied from the view point of fracture mechanics and fractographic consideration. The fatigue crack growth rate decreased with an increase in the degree of polymerization at the same stress intensity factor range. The rate for the specimen PVC (Pb) was lower than that of PVC (Sn). This result was explained by macroscopic and microscopic observation on fracture surface. The rate for the specimen PVC (Pb)/MBS increased with an increase in the amount of reformer MBS, but that for the specimen PVC (Sn)/MBS depended upon both the quantity and the dispersion state of reformer.
Striations and tear lines were observed on the fatigue fracture surface of PVC(Sn). Ripple-like and tear patterns were observed on the fracture surface of PVC (Sn)/MBS, while, dimple patterns were observed on the fracture surfaces of PVC(Pb) and PVC(Pb)/MBS.
