ANNEALING EFFECTS ON THE YIELD AND FRACTURE OF BISPHENOL-A AND 4,4'-DIHYDROXYDIPHENYL COPOLYCARBONATES

摘要

The annealing effects on yield and fracture behavior of two different polycarbonates, one bisphenol-A-based (BPA) and one copolycarbonate of BPA and 4,4'-dihydroxydiphenyl (DOD), have been investigated. Annealing increases the yield stress, decreases the tan 5 intensity at 80°C, and decreases the resistance to crack growth in both materials. The DOD material shows a slightly increased resistance to annealing compared to the conventional polycarbonate based on relative post-yield stress drops and tearing moduli of the materials.