| Project/Area Number |
17550120
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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 |
Polymer chemistry
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| Research Institution | Kanagawa University |
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Principal Investigator |
YOKOZAWA Tsutomu Kanagawa Univ., Dept.of Material and life Chemistry, Professor, 工学部, 教授 (80182690)
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| Co-Investigator(Kenkyū-buntansha) |
YOKOYAMA Akihiro Kanagawa Univ., Dept.of Material and Life Chemistry, Assistant Professor, 工学部, 助教 (50343637)
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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 |
¥3,500,000 (Direct Cost: ¥3,500,000)
Fiscal Year 2006: ¥1,600,000 (Direct Cost: ¥1,600,000)
Fiscal Year 2005: ¥1,900,000 (Direct Cost: ¥1,900,000)
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| Keywords | Chain-growth polycondensation / Polycondensation / Polythiophene / Polyphenylene / Conducting polymer / Living polymerization / Metalic Catalyst / Coupling reaction |
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| Research Abstract |
We have reported that the polycondensation of 2-bromo-5-chloromagnesio3-hexylthiophene with Ni(dppp)Cl_2 proceeds in a chain polymerization manner to yield head-to-tail poly(3-hexylthiophene) (HT-PHT) with low polydispersities and that the M_n of HT-PHT is controlled by the feed ratio of the monomer to Ni catalyst. In this research, we study the generality of this new type chain-growth polymerization that proceeds with transfer of the catalyst to the polymer end group.
1. Effect of side chain of thiophene monomers A thiophene monomer with the methoxyethoxyethoxymethyl group underwent catalyst-transfer chain-growth polymerization in the presence of Ni(dppe)Cl_2 instead of Ni(dppp)Cl_2, which was the most effective catalyst for the catalyst-transfer chain polymerization of the hexyl counterpart.
2. TEffect of aromatic ring of the monomer A phenylene monomer was turned out to undergo catalyst-transfer chain-growth polymerization with Ni(dppe)Cl_2 in the presence of LiCl to afford polyphenylene with a defined molecular weight and a low polydispersity. The use of LiCl is crucial, and the polymer with broad molecular weight distribution was obtained in the absence of LiCl.
3. Polymerization of Pyrrol monomer An N-hexyl pyrrol monomer was polymerized with Ni(dppe)Cl_2 in the presence of dppe to yield well-defined polypyrrol. The polymerization behavior shows living polymerization character in a manner similar to the polymerization of the above monomers.
4. Synthesis of block copolymers We first synthesized polythiophene block copolymers having different side chains. Furthermore, the block copolymers of polythiophene and polyphenylene, and the block copolymers of polythiophene and polypyrrol were synthesized in a controlled fashion. We found that the order of the polymerization of monomers were important for the synthesis of well-defind block copolymers from different aromatic monomers.
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