Fracture Behavior of Polycarbonate/Polyestercarbonate Blends
- Fracture Behavior of Polycarbonate/Polyestercarbonate Blends
- 이용범; 이춘수; 김대식; 김종현; 조재영; 이상수
- polycarbonate; polyestercarbonate; blend; thickness sensitivity; ductile-brittle transition
- Issue Date
- 폴리머; Polymer(Korea)
- VOL 35, NO 6, 537-542
- Fracture behaviors of polycarbonate (PC)/polyestrercarbonate (PEC) blends and their miscibility
have been examined to find out the mechanism of ductilie-brittle transition of fracture behavior which would
be a main governing factor on the thickness sensitivity of impact strength of PC. Tg measurement showed
that PEC with carbonate content higher than 30 mol% was miscible with PC. In notched Izod impact test of
PC ductile-brittle transition occurred in the range of 4 to 5 mm thickness. The impact strength of miscible
PC/PEC5 blends ductile-fractured in the thin specimens decreased with increasing PEC5 content, which
was in accordance with the decrease of elongation at break in tensile test. In the brittle fracture of the thick
specimens the impact strength was well correlated with the plastic zone size in the vicinity of the notch tip.
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