Abstract
Entropic elasticity, a property typical of rubbers and well known in organic polymers with appropriate network structures, is not known to occur in oxide glasses1,2. Here, we report the occurrence of entropic elasticity in phosphate-glass fibres with highly anisotropic structures, drawn by mechanical elongation from supercooled liquids. We observed a large lengthwise shrinkage of ~35% for phosphate glasses with an enhanced one-dimensional structure, as well as a distinct endotherm on reheating them up to temperatures between that of the glass transition temperature and the softening temperature. Our results strongly suggest the possibility of designing oxide glasses with a rubbery nature at high temperatures.
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Acknowledgements
A part of the present research was supported by the fund from the MEXT Element Strategy Initiative to form core research centres. We would like to thank S. Kohara and H. Tajiri (Japan Synchrotron Radiation Research Institute, JASRI), Y. Benino (Okayama University), and N. Shimizu and H. Takagi (High Energy Accelerator Research Organization, KEK) for insightful discussions. High-energy X-ray diffraction experiments were performed at the BL04B2 beamline of SPring-8 with the approval of the Japan Synchrotron Radiation Research Institute (Proposal No. 2014A1096).
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S.Inaba and S.Ito designed and ran the experiments and analysed the data. All authors discussed the results, commented on the study and co-wrote the manuscript.
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Inaba, S., Hosono, H. & Ito, S. Entropic shrinkage of an oxide glass. Nature Mater 14, 312–317 (2015). https://doi.org/10.1038/nmat4151
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DOI: https://doi.org/10.1038/nmat4151
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