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| Volume 1, Issue 01 - 2006, January |
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| 3 |
Effect of Diblock Copolymers on the Film Structure of Spin Cast Polymer Blends |
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| Pages 23-34 |
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| J. RACZKOWSKA1, A. BUDKOWSKI1,*, J. RYSZ1, P. CZUBA1, M. LEKKA, A. BERNASIK3 |
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1 M. Smoluchowski Institute of Physics, Jagellonian University, Reymonta 4, 30-059 Krakow, Poland
2 Institute of Nuclear Physics, Polish Academy of Sciences, Radzikowskiego 152, 31-342 Krakσw
3 Faculty of Physics and Applied Computer Science, AGH-University of Science and Technology,
Mickiewicza 30, 30-059 Krakow |
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| Received 7 July 2005 ; accepted 3 November 2005 |
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| Thin films of polystyrene (PS)/ poly(methyl methacrylate) (PMMA) blends (50/50, w/w, binary composition) with PS-PMMA diblock copolymers added (weight fraction ΦC = 0-0.10) have been spin cast on gold from toluene solutions and examined with atomic and lateral force microscopy combined with selective dissolution. All films consist of PMMA lamella, adjacent to substrate, and lateral phase arrangement, facing surface and characterised by length scale R. Three types of film structure were observed: For ΦC = 0, surface undulations developed into isolated PMMA protrusions (2.5 ≤R≤5.1 μm) suggest interfacial (dewetting) instability of transient bilayer PS/PMMA, modified when diblocks segregate at interface. For ΦC=0.05, R is reduced to ~ 1 μm and micelle-like circular PMMA islands are formed. For higher copolymer content, some of these islands become elongated and for ΦC = 0.10 yield almost bicontinuous morphologies (with R ~ 2 μm) resembling emulsion. |
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