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6665911 
Journal Article 
Phase structure of binary and ternary polycarbonate blends 
Lednicky, F; Hromadkova, J; Kolarik, J; , 
1999 
1 
Polymer Testing
ISSN: 0142-9418
EISSN: 1873-2348 
ELSEVIER SCI LTD 
OXFORD 
18 
2 
123-134 
English 
WOS:000079900500004 
Phase structures of binary and ternary blends of polycarbonate (PC) with poly(styrene-co-acrylonitrile) (PSAN), and poly(methyl methacrylate-co-styrene) (PMMAS) were examined by transmission (TEM) and/or scanning transmission electron microscopy (STEM). Osmium or ruthenium tetroxides were applied to ultrathin sections and significant differences in the staining of phases were observed: PC was stained most intensely, while staining of the PSAN- and PMMAS-rich phases was affected by the concentration of the dissolved (partially miscible) PC. The blends within the phase inversion interval contained both PC continuous and PC dispersed phases, which were observed at different places on the sample cross-section. Three-phase structure, found in ultrathin sections of binary blends and confirmed on plasma-etched cut surfaces, is discussed from the point of view of likely artefacts; a possible interpretation considers nonuniform blending in the melt. (C) 1999 Elsevier Science Ltd. All rights reserved.