Morphology of poly(styrene‐block‐dimethylsiloxane) copolymer films |
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Authors: | Ningjing Wu Anna Zheng Yongmin Huang Honglai Liu |
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Affiliation: | 1. Key Laboratory for Rubber and Plastics Engineering of the Ministry of Education, Qingdao University of Science and Technology, Qingdao 266042, China;2. Key Laboratory for Ultrafine Materials of the Ministry of Education, East China University of Science and Technology, Shanghai 200237, China;3. State Key Laboratory of Chemical Engineering, East China University of Science and Technology, Shanghai 200237, China |
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Abstract: | The morphologies of poly(styrene‐block‐di‐methylsiloxane) (PS‐b‐PDMS) copolymer thin films were analyzed via atomic force microscopy and transition electron microscopy (TEM). The asymmetric copolymer thin films spin‐cast from toluene onto mica presented meshlike structures, which were different from the spherical structures from TEM measurements. The annealing temperature affected the surface morphology of the PS‐b‐PDMS copolymer thin films; the polydimethylsiloxane (PDMS) phases at the surface were increased when the annealing temperature was higher than the PDMS glass‐transition temperature. The morphologies of the PS‐b‐PDMS copolymer thin films were different from solvent to solvent; for thin films spin‐cast from toluene, the polystyrene (PS) phase appeared as pits in the PDMS matrix, whereas the thin films spin‐cast from cyclohexane solutions exhibited an islandlike structure and small, separated PS phases as protrusions over the macroscopically flat surface. The microphase structure of the PS‐b‐PDMS copolymer thin films was also strongly influenced by the different substrates; for an asymmetric block copolymer thin film, the PDMS and PS phases on a silicon substrate presented a lamellar structure parallel to the surface at intervals. © 2007 Wiley Periodicals, Inc. J Appl Polym Sci 104: 1010–1018, 2007 |
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Keywords: | atomic force microscopy (AFM) morphology polysiloxanes polystyrene |
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