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Conformations of hydrogenated ring-opened poly(norbornene)s in dilute solution

Polymer Journal volume 56, pages 153–161 (2024)Cite this article

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Abstract

The characteristic ratios C∞ of syndiotactic, isotactic, and atactic hydrogenated ring-opened poly(norbornene)s, H-poly(NB)s, were determined in 1,2,4-trichlorobenzene (TCB) at 140 °C with molecular dynamics simulations and size exclusion chromatography with a multiangle light-scattering online detector (SEC-MALS). The C∞ results were 11, 14 and 12 for syndiotactic, isotactic and atactic H-poly(NB), respectively, all of which were consistent with the rotational isomeric state model. These C∞ values for H-poly(NB)s were definitely larger than those for polyethylene and syndiotactic and isotactic polypropylenes. The stiffness of the H-poly(NB) chains was induced by the internal rotations of two main-chain bonds included in the cyclopentane ring in each H-poly(NB) repeat unit, which were restricted near the trans conformation.

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Acknowledgements

The authors thank Mr. Yoshinori Matsumoto (Tosoh Analytical Technology Center) for his cooperation in SEC-MALS measurements.

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Author notes

  1. Yuki Nakama

    Present address: Zeon Corporation R&D Center, 1-2-1 Yako, Kawasaki-ward, Kawasaki, Kanagawa, 210-9507, Japan

  2. Takahiro Sato

    Present address: Osaka Study Center, The Open University of Japan, 4-9-23, Onohara-Higashi, Minoh, Osaka, 562-0031, Japan

Authors and Affiliations

  1. Department of Macromolecular Science, Osaka University, 1-1 Machikaneyama-cho, Toyonaka, Osaka, 560-0043, Japan

    Yuki Nakama & Takahiro Sato

  2. Zeon Corporation R&D Center, 1-2-1 Yako, Kawasaki-ward, Kawasaki, Kanagawa, 210-9507, Japan

    Satoshi Natori & Shigetaka Hayano

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  1. Yuki Nakama
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  4. Takahiro Sato
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Contributions

YN and TS planned and directed the project; SH synthesized the samples; YN conducted the experiments. SN conducted MD simulations; TS formulated the theory; YN and TS analyzed the SEC-MALS data and calculated the characteristic ratios on the basis of the RIS model. YN, SN and TS wrote the manuscript. All authors have approved the final version of the manuscript.

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Correspondence to Takahiro Sato.

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Nakama, Y., Natori, S., Hayano, S. et al. Conformations of hydrogenated ring-opened poly(norbornene)s in dilute solution. Polym J 56, 153–161 (2024). https://doi.org/10.1038/s41428-023-00852-y

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