2022 Fiscal Year Final Research Report
'Advanced' Polymer Main-Chain Exchange Reaction Applicable in Solid-State and Self-Healing Materials
| Project/Area Number |
20K21219
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| Research Category |
Grant-in-Aid for Challenging Research (Exploratory)
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| Allocation Type | Multi-year Fund |
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| Review Section |
Medium-sized Section 35:Polymers, organic materials, and related fields
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| Research Institution | Shinshu University |
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Principal Investigator |
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| Project Period (FY) |
2020-07-30 – 2023-03-31
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| Keywords | 共役置換反応 / メカノケミカル重合 / メカノケミカル分解 / 主鎖切断 / 不飽和ポリエステル / ビトリマー |
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| Outline of Final Research Achievements |
The mechanochemical polymerization of bis[2-(bromomethyl)acrylate] and dicarboxylic acid was catalyzed by a tertiary amine. This technique was particularly effective in the polymerization of insoluble monomers. The obtained poly(conjugated ester)s were decomposed by mechanically mixing with diethylamine by the conjugate substitution reaction . The polymers were decomposed even in the glassy state, although the strong interaction between polymer chains, particularly in crystalline phase, surpressed decomposition. The conjugate substitution reaction in solid state was also applied to prepare vitrimers using a copolymer of acrylic acid and ethyl acrylate and bis[2-(bromomethyl)acrylate]. The obtained network polymers behaved of typical crosslinked structure in dynamic mechanical analysis, whereas they exhibited plasticity in the presence of a tertiary amine catalist and stress-relaxation, which are characteristic perfomances as a vitrimer.
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| Free Research Field |
高分子化学
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| Academic Significance and Societal Importance of the Research Achievements |
室温，常圧，短時間，無溶媒で重合する，低環境負荷なポリエステル製造法を提供した．また，従来合成困難であった，難溶性モノマーの重合も実現した．さらに，同じ反応機構・プロセスでの高分子分解も実現した．研究では反応解析を容易にするため，合成と分解が不可逆的に進行する系を採用したが，その成果は，メカノケミカルな共役置換反応を酢酸等によるカルボン酸交換反応に応用した，ケミカルリサイクルへの可能性を示した．研究の終盤では，プレス成形や応力緩和が可能なビトリマー材料を創成した．この材料は自己修復性等も期待されることから，さらなる研究に繋がっている．
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