Humid annealing induced microphase separation in poly(N-dodecylacrylamide-b-polyethylene glycol) film
A block copolymer composed of poly(N-dodecylacrylamide) (pDDA) and polyethylene glycol (PEG) was synthesized using macro-azo-initiator containing PEG group. A thin film of pDDA-b-PEG was prepared by spin coating and the structure of the film was analyzed by X ray diffraction (XRD) and atomic force m...
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Published in | Molecular Crystals and Liquid Crystals Vol. 685; no. 1; pp. 7 - 13 |
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Main Authors | , , |
Format | Journal Article |
Language | English |
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Philadelphia
Taylor & Francis
24.05.2019
Taylor & Francis Ltd |
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Abstract | A block copolymer composed of poly(N-dodecylacrylamide) (pDDA) and polyethylene glycol (PEG) was synthesized using macro-azo-initiator containing PEG group. A thin film of pDDA-b-PEG was prepared by spin coating and the structure of the film was analyzed by X ray diffraction (XRD) and atomic force microscopy measurements. A thermally annealed film of pDDA-b-PEG formed an amorphous film with uniform surface. On the other hand, when the film was annealed at 60 ˚C under 98%RH (humid annealing), nano dots composed of PEG units were formed. The XRD spectral results indicate that pDDA block formed a highly ordered lamellar structure. It was concluded that the lamellar structure was formed by nanophase separation induced by the humid annealing. The lamellae plane is aligned parallel to the substrate surface and the dodecyl side chains were oriented perpendicular to the lamella plane. The nano dots were not formed when pDDA block took an amorphous structure. Therefore, it was concluded that lamellar structure formation of pDDA induced the microphase separation in the block copolymer to form the nanodots. |
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AbstractList | A block copolymer composed of poly(N-dodecylacrylamide) (pDDA) and polyethylene glycol (PEG) was synthesized using macro-azo-initiator containing PEG group. A thin film of pDDA-b-PEG was prepared by spin coating and the structure of the film was analyzed by X ray diffraction (XRD) and atomic force microscopy measurements. A thermally annealed film of pDDA-b-PEG formed an amorphous film with uniform surface. On the other hand, when the film was annealed at 60 ˚C under 98%RH (humid annealing), nano dots composed of PEG units were formed. The XRD spectral results indicate that pDDA block formed a highly ordered lamellar structure. It was concluded that the lamellar structure was formed by nanophase separation induced by the humid annealing. The lamellae plane is aligned parallel to the substrate surface and the dodecyl side chains were oriented perpendicular to the lamella plane. The nano dots were not formed when pDDA block took an amorphous structure. Therefore, it was concluded that lamellar structure formation of pDDA induced the microphase separation in the block copolymer to form the nanodots. A block copolymer composed of poly(N-dodecylacrylamide) (pDDA) and polyethylene glycol (PEG) was synthesized using macro-azo-initiator containing PEG group. A thin film of pDDA-b-PEG was prepared by spin coating and the structure of the film was analyzed by X ray diffraction (XRD) and atomic force microscopy measurements. A thermally annealed film of pDDA-b-PEG formed an amorphous film with uniform surface. On the other hand, when the film was annealed at 60 C under 98%RH (humid annealing), nano dots composed of PEG units were formed. The XRD spectral results indicate that pDDA block formed a highly ordered lamellar structure. It was concluded that the lamellar structure was formed by nanophase separation induced by the humid annealing. The lamellae plane is aligned parallel to the substrate surface and the dodecyl side chains were oriented perpendicular to the lamella plane. The nano dots were not formed when pDDA block took an amorphous structure. Therefore, it was concluded that lamellar structure formation of pDDA induced the microphase separation in the block copolymer to form the nanodots. |
Author | Matsui, Jun Ito, Sachiho Matsunaga, Kohei |
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Cites_doi | 10.1021/ma050394k 10.1021/cr900159v 10.1038/nmat966 10.1002/pat.276 10.1295/polymj.PJ2006039 10.1016/j.jcis.2007.04.026 10.1201/9781439894156 10.1039/c2cs35115c 10.1016/S0040-6031(02)00185-5 10.1246/cl.171188 10.1039/C6RA27994E 10.1038/pj.2009.320 10.1021/la00028a047 10.1088/1367-2630/6/1/010 |
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SubjectTerms | Annealing Atomic force microscopy Block copolymers Lamella lamellar film Lamellar structure microphase separation Microscopy nanophase separation Polyethylene glycol self-assembly Separation Spin coating Substrates Thin films X-ray diffraction |
Title | Humid annealing induced microphase separation in poly(N-dodecylacrylamide-b-polyethylene glycol) film |
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