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Variation of free volume size and content of shape memory polymer — Polyurethane — Upon temperature studied by positron annihilation lifetime techniques and infrared spectroscopy

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Abstract

Positron annihilation lifetime measurement and Fourier transform infrared spectrometry were applied to the study of temperature dependencies of free volume parameters and hydrogen bonds in segmented polyurethane, specially fabricated as a shape memory polymer. The variation of free volumes in amorphous region were correlated to that of hydrogen bonding and the shape memory mechanism of polyurethane is elucidated from a microscopic point of view. The relationship between free volume contents and the formation of hydrogen bonds significantly suggests that the shape memory occurs due to the configurational recovery of the microscopic regulation around urethane bundles of hard segment and consequent restoration of soft-segment in polyurethane.

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Authors and Affiliations

  1. Research Center for Advanced Science and Technology, The University of Tokyo, 4-6-1 Komaba, Meguro-ku, 153, Tokyo, (Japan)

    K. Ito, K. Abe, H. L. Li & Y. Ujihira

  2. Technical Headquarters, Nagoya Research & Development Center, Mitsubishi Heavy Industries Ltd., Iwatsuka-cho, Nakamura-ku, 453, Nagoya, (Japan)

    N. Ishikawa & S. Hayashi

Authors
  1. K. Ito
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  2. K. Abe
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  3. H. L. Li
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  4. Y. Ujihira
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  5. N. Ishikawa
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  6. S. Hayashi
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Ito, K., Abe, K., Li, H.L. et al. Variation of free volume size and content of shape memory polymer — Polyurethane — Upon temperature studied by positron annihilation lifetime techniques and infrared spectroscopy. Journal of Radioanalytical and Nuclear Chemistry, Articles 211, 53–60 (1996). https://doi.org/10.1007/BF02036255

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  • DOI: https://doi.org/10.1007/BF02036255

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