| Project/Area Number |
17550121
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Functional materials chemistry
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| Research Institution | Hokkaido University |
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Principal Investigator |
YE Shen Hokkaido University, Catalysis Research Center, Associate Professor, 触媒化学研究センター, 助教授 (40250419)
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| Co-Investigator(Kenkyū-buntansha) |
グン 剣萍 北海道大学, 大学院・理学研究科, 教授 (20250417)
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| Project Period (FY) |
2005 – 2006
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| Project Status |
Completed (Fiscal Year 2006)
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| Budget Amount *help |
¥3,600,000 (Direct Cost: ¥3,600,000)
Fiscal Year 2006: ¥1,400,000 (Direct Cost: ¥1,400,000)
Fiscal Year 2005: ¥2,200,000 (Direct Cost: ¥2,200,000)
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| Keywords | Polymer surface structure / Surface physical property / Surface vibration spectroscopy / Molecular structure at interface / Surface biocompatibility / Sum frequency generation (SFG) / Water / Interface |
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| Research Abstract |
Physical properties and functionalities of soft materials such as polymer and LB films are significantly dependent on their surface/interface molecular structures. Our researches focus upon exploring the molecular structures on the surface and/or interface of the functional organic thin films, by a surface-sensitive non-linear optical vibration spectroscopy, sum frequency generation (SFG), while such structural information is hard to be obtained by the conventional vibration spectroscopy such as infrared (IR) absorption and Raman scattering.
The present research is mainly focused on (1) poly(acrylate) and their co-polymer thin films, (2) polyimide thin films and (3) LB multilayer thin films, in different environments. It is clearly found that most of these polymer materials have ordered structures on the surface although their bulk structures are completely random. The surface structures can be associated with their surface properties. For example, when the poly(2-methoxyethyl acrylate) (PMEA) was immersed into water, a hydrogen bonding between carbonyl group and water molecule was only observed on its surface but not in its bulk. This kind of hydrogen bonding was hard to observe in other poly(acrylate)s and therefore, is expected to related with PMEA's excellent biocompatibility. On the other hand, the surface structures of the poly(acrylate)s are almost identical after rubbing treatment. This is in contrast with polyimide films. A large anisotropic structural feature was observed on the polyimide surface after simple rubbing treatment. The rubbing-induced surface reorientation is dependent on the function groups and π-π stacking of the polyimide. Detailed structural changes on the polyimide surface were analyzed from the SFG results. Furthermore, SFG measurements were also carried out to probe the structure on the any layer-layer interface in a multilayer LB film based on a theoretical model developed by our group recently.
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