| Budget Amount *help |
¥17,550,000 (Direct Cost: ¥13,500,000、Indirect Cost: ¥4,050,000)
Fiscal Year 2011: ¥5,070,000 (Direct Cost: ¥3,900,000、Indirect Cost: ¥1,170,000)
Fiscal Year 2010: ¥5,590,000 (Direct Cost: ¥4,300,000、Indirect Cost: ¥1,290,000)
Fiscal Year 2009: ¥6,890,000 (Direct Cost: ¥5,300,000、Indirect Cost: ¥1,590,000)
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| Research Abstract |
Phase structures of cured epoxy resins modified with several PMMA-b-PnBA-b-PMMA triblock copolymers(BCP) were studied. The BCPs synthesized by living anionic polymerization were applied as the modifiers for the epoxy resin : diglycidyl ether of bisphenol A(DGEBA). An aromatic amine, an acid anhydride and an anionic polymerization catalyst as curing agents resulted in macro-phase separation of the DGEBA/BCP blends during the cure process. However, a phenol novolac(PN) as the curing agent created nano-phase structures in the DGEBA/BCP blends by activating the self-assembling ability of the BCPs in the epoxy blends. The miscibility of the PMMA block in the BCPs to the PN cured epoxy resin was a key factor to keep the phase structures in nano size. Several nano-phase structures, such as spherical micelles, cylindrical micelles, and curved lamella-like micelles were found in the blends. The size of the nano-phases was 20-40 nm in terms of the diameter or the thickness. The types of the nano-phase structures could be controlled by the resin composition of the blends, the block composition and the molecular weight of the BCPs.
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