| Budget Amount *help |
¥19,110,000 (Direct Cost: ¥14,700,000、Indirect Cost: ¥4,410,000)
Fiscal Year 2014: ¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000)
Fiscal Year 2013: ¥3,510,000 (Direct Cost: ¥2,700,000、Indirect Cost: ¥810,000)
Fiscal Year 2012: ¥13,910,000 (Direct Cost: ¥10,700,000、Indirect Cost: ¥3,210,000)
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| Outline of Final Research Achievements |
Telechelic polyisoprene (Mw=92k) was synthesized by an anionic polymerization and it was cyclized by end-to-end ring closure reaction in good and poor solvents under dilute conditions to synthesize unknotted/knotted ring polymers. The ring polymers obtained were separated from the cyclization reaction products by precipitational fractionation. By SEC-MALS measurements of the fractionated samples, it has been found that two ring polymers have almost the same molecular weight, while the ring formed in poor solvent reveals the smaller chain dimension than that of the ring formed in good solvent. These results clearly indicate the evidence of the formation of knotted ring polymers. To prepare polymer brush for the topology observation of a single molecule by AFM, grafting reaction was carried out to polyisoprene. From the AFM observation, architecture of knotted ring such as trefoil knot was clearly observed brushed ring formed in in poor solvent.
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