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1176521 
Journal Article 
Influence of ABS type on morphology and mechanical properties of PC/ABS blends 
Lombardo, BS; Keskkula, H; Paul, DR 
1994 
Yes 
Journal of Applied Polymer Science
ISSN: 0021-8995
EISSN: 1097-4628 
54 
11 
1697-1720 
WOS:A1994PQ93600013 
The morphology and the mechanical properties of polycarbonate (PC) blends with different acrylonitrile-butadiene-styrene (ABS) materials were investigated. PC/ABS blends based on a mass-made ABS with 16% rubber and large (0.5-1 mu m) rubber particles are compared to blends based on an emulsion-made ABS with 50% rubber and small, monodisperse (0.12 mu m) rubber particles over the full range of blend compositions. The blends with the bulk ABS showed excellent impact strength for most compositions, and those containing 50 and 70% PC exhibited ductile to brittle transition temperatures below that of PC. The blends with the emulsion ABS showed excellent toughness in sharp notch Izod impact tests at room temperature and in standard notch Izod impact tests at low temperatures near the T-g of the rubber. By melt blending the various ABS materials with a styrene-acrylonitrile (SAN 25) copolymer, materials with lower rubber concentrations were obtained. These materials were used in blends with PC to make comparisons at constant rubber concentrations of 5, 10, and 15%. The results of this investigation show that brittle ABS materials can produce tough PC-ABS blends. It is apparent that small rubber particles toughen PC-ABS blends at lower rubber concentrations and at lower temperatures than is possible with large rubber particles. However, additional work is needed to understand the nature of toughening in these PC-ABS blends with different rubber phase morphologies. It is of particular interest to understand the exceptional ductility of some of the blends at low temperatures. (C) 1994 John Wiley and Sons, Inc.