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Anisotropic rotational dynamics of rod-like low-mass molecules in polycarbonate

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Abstract

Comparison of the dielectric relaxation (DR) behaviors of two polar rod-like low-mass molecules (LMs), cyanobiphenyl (CB) and 5-phenyl-2,3′-bipyridine (PBP), in antiplasticized polycarbonate (PC) revealed that rotations around the short and long axes of the LMs appeared from 60 to 125 °C (β region) and from −150 to −50 °C (γ region), respectively. The cooperativity between the local dynamics in PC, measured by dynamic mechanical analysis, and the rotation of the LMs around the short axis was examined based on the relaxation times and activation energies for the LMs (CB and PBP) and PC. The dynamic cooperativity involved the antiplasticization of PC. In contrast, the rotation of the LM (PBP) around its long axis was independent of the local motion in PC, resulting in no contribution to the antiplasticization phenomenon.

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Acknowledgements

This work was partly supported by JSPS KAKENHI (Grant Number 19K05613) (SN) and the Sasakawa Scientific Research Grant from the Japan Science Society (MM). The DMA measurement was supported by the Equipment Sharing Division, Organization for Co-Creation Research and Social Contributions, Nagoya Institute of Technology.

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  1. Department of Life Science and Applied Chemistry, Graduate School of Engineering, Nagoya Institute of Technology, Gokiso-cho, Showa-ku, Nagoya, Aichi, 466-8555, Japan

    Mai Maeda, Shogo Nobukawa & Katsuhiro Inomata

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  1. Mai Maeda
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  2. Shogo Nobukawa
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Correspondence to Shogo Nobukawa.

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Maeda, M., Nobukawa, S. & Inomata, K. Anisotropic rotational dynamics of rod-like low-mass molecules in polycarbonate. Polym J 54, 21–31 (2022). https://doi.org/10.1038/s41428-021-00562-3

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