日本ゴム協会誌
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97 巻, 1 号
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  • 動的結合と静的共有結合を含む マルチネットワークシステム「熱可塑性と耐クリープ性の両立」1　水素結合 -1
    知野 圭介
    2024 年 97 巻 1 号 p. 3-8
    発行日: 2024年
    公開日: 2024/01/25
    DOIhttps://doi.org/10.2324/gomu.97.3
    ジャーナル 認証あり
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    In general, rubber has a weak interaction between molecular chains, so if it is not crosslinked, it will flow and cannot withstand actual use. Covalent crosslinked rubber has high mechanical properties due to the strong bonding force of crosslinking, but it is difficult to reshape and recycle because of the difficulty to cleave the crosslink. On the other hand, thermoplastic elastomers use physical interactions between molecular chains (physical crosslinking) to suppress fluidity and express physical properties. Therefore, although it can be reshaped by disconnecting the physical crosslink due to heat, it lacks heat resistance (creep resistance). Heat resistance (creep resistance) is very important in industrial materials, but thermoplasticity and heat resistance have a trade-off relationship. As an attempt to break this trade-off, many studies have been reported to use dynamic bonds such as hydrogen bonds, ionic bonds, and dynamic covalent bonds for crosslinking. However, this trade-off has not been resolved. In recent years, for the purpose of improving heat resistance and creep resistance, attempts have been made to introduce static covalent bonds to dynamic bonding crosslinks, which will be explained in this lecture.

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  • 今一度考えたい架橋ゴムの構造と物性発現のメカニズム
    （その1）おぼろげながら見えてきた架橋ゴムの構造
    深堀 美英
    2024 年 97 巻 1 号 p. 9-15
    発行日: 2024年
    公開日: 2024/01/25
    DOIhttps://doi.org/10.2324/gomu.97.9
    ジャーナル 認証あり
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    Recent studies concerning structure of cross-linked rubber verified experimentally and theoretically are summarized, where is shown that the real structure is different significantly from a molecular cross-linked model known conventionally. (1) Cross-linked rubber consists of heterogeneous structure of cross-linked phase and uncross-linked phase where both the phases are separated making co-continuous structure. Volume fraction in the system is 65~70% for the cross-linked phase and 30~35% for the uncross-linked phase. (2) The cross-linked phase is crosslinked tightly in a molecular scale, then it hardly deforms at an external deformation. In contrast, the uncross-linked phase seems not to be crosslinked keeping the original uncross-linked and liquid state, thus it mainly deforms under the external deformation and absorbs most solvents in a swelling test. (3) AFM image describes the crosslinked structure of rubber almost correctly, where the phase-separated structure is shown clearly as indicated by the simulation.

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