1993 Fiscal Year Final Research Report Summary
Surface Structure and Dynamics of Functional Block Copolymer
| Project/Area Number |
03044059
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| Research Category |
Grant-in-Aid for international Scientific Research
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| Allocation Type | Single-year Grants |
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| Section | Joint Research |
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| Research Institution | Tokyo Institute of Technology |
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Principal Investigator |
NAKAHAMA Seiichi Tokyo Institute of Technology, Faculty of Engineering, Professor, 工学部, 教授 (90016410)
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| Co-Investigator(Kenkyū-buntansha) |
CASTNER David G. University of Washington, Dept. of Chemical Engr., Professor, 化学工学科, 教授
RATNER Buddy D. University of Washington, Dept. of Chemical Engr., Professor, 化学工学科, 教授
HIRAO Akira Tokyo Institute of Technology, Faculty of Engineering, Associate Professor, 工学部, 助教授 (00111659)
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| Project Period (FY) |
1991 – 1993
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| Keywords | Hydrophobic-hydrophilic block copolymer / Surface structure / Anionic living polymerization / Contact angle / Transmission electron microscopy / XPS / Surface reconstruction / SIMS |
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| Research Abstract |
Hydrophilic-hydrophobic block copolymers, poly(2,3-dihydroxypropyl methacrylate) (PDIMA)-b-polystyrene, PDIMA-b-poly(4-octylstyrene), and PDIMA-b-polyisoprene, have been synthesized by anionic living polymerization. The weight % of PDIMA was around 50 %. The surface structures of the block copolymers were investigated by transmission electron miroscopic(TEM) observation, XPS and contact angle(CA) measurements.
The specimens for TEM observation were cast from 3% DMF or THF/methanol solution. The dry and wet samples were fixed and stained with OsO4 vapor solution, respectively. The sample embedded in epoxy resin were cut into the ultra thin sections. The specimens for XPS and CA measurements were prepared by spin-coating onto a glass disk. After treatment of the film under various conditions, as-cast, soaking in water, and annealing at 100^ﾟC in air after soaking in water, CA of water was measured.
TEM observation of the as-cast film of PDIMA-b-polystyrene showed that the outermost surface was completely covered with polystyrene layer. After soaking in water for 30 min, the top layer of polystyrene was completely disappeared to lead hydrophilic surface. In the case of PDIMA-b-polyisoprene, the hydrated morphology was also observed inside of the film. The XPS measurement gave the consistent results with those of the TEM observation. The contact angle measurement was successful for the PDIMA-b-polystyrene film, but not for the PDIMA-b-poly(4-octylstyrene) and PDIMA-b-polyisoprene films. This is because of rapid rearrangement of the surface structure at the water-polymer interface.
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