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Excess heat capacity for low-molecular-weight amorphous polystyrene below the glass-transition temperature: influence of end groups

Polymer Journal volume 52, pages 575–580 (2020)Cite this article

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Abstract

In this work, we analyze the absolute heat capacity below the glass-transition temperature Tg for two types of amorphous polystyrene with differing low-molecular weights. Both amorphous polystyrenes have excess heat capacities that cannot be reproduced by skeletal and group vibrations from 70 K to Tg, which differs from the results for amorphous polystyrene with large molecular weights. The excess heat capacity is analyzed using the Schottky model. The ratio of the degrees of freedom of the Schottky model NSC for PS-A300 and PS-A500 (NSC,PS-A300/NSC,PS-A500) is 1.6, which reflects the ratio of the end groups per molecule ((i.e., the number of monomer units of PS-A500/the number of monomer units of PS-A300 = 5/3) = 1.7), and the resulting excitation energy (=31 meV) is consistent with that determined using inelastic neutron scattering (=30 meV).

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Acknowledgements

The authors would like to thank Enago (www.enago.jp) for the English language review.

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Authors and Affiliations

  1. Graduate School of Engineering, Chiba Institute of Technology, 2-1-1 Shibazono, Narashino, Chiba, 275-0023, Japan

    Marika Yokota, Eri Nishiyama, Jun Fujimura & Itaru Tsukushi

  2. Department of Mathematics and Science, School of Science and Engineering, Kokushikan University, 4-28-1 Setagaya, Setagaya-ku, Tokyo, 154-8515, Japan

    Eri Nishiyama

  3. Research Center for Thermal and Entropic Science, Graduate School of Science, Osaka University, 1-1 Machikaneyama-cho, Toyonaka, Osaka, 560-0043, Japan

    Jun Fujimura

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Correspondence to Itaru Tsukushi.

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Yokota, M., Nishiyama, E., Fujimura, J. et al. Excess heat capacity for low-molecular-weight amorphous polystyrene below the glass-transition temperature: influence of end groups. Polym J 52, 575–580 (2020). https://doi.org/10.1038/s41428-020-0310-4

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