Nuclear Science and Techniques

《核技术》(英文版) ISSN 1001-8042 CN 31-1559/TL     2018 Impact factor 0.961

Nuclear Science and Techniques ›› 1997, Vol. 8 ›› Issue (4): 221

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Studies on microdomain structure in segmented polyether polyurethaneureas by positron annihilation lifetime and small-angle X-ray scattering

Yin Chuan-Yuan1, Gu Qing-Chao2   

  1. 1 Department of Physics, Nanjing University, Nanjing 210093;
    2 Department of Polymer Science and Engineering, Nanjing University, Nanjing 210093
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Yin Chuan-Yuan, Gu Qing-Chao. Studies on microdomain structure in segmented polyether polyurethaneureas by positron annihilation lifetime and small-angle X-ray scattering.Nuclear Science and Techniques, 1997, 8(4): 221

Abstract: The microdomain structure of segmented polyether polyurethaneureas is investigated by means of positron annihilation lifetime spectroscopy, small-angle X-ray scattering and differential scanning calorimetry. The experimental results show that the decrease in the domain volume and free volume results from the increase in the hard segment (polyurethaneurca segment) contents as the number-average molecular weight Mn of the soft segments (polyethylene glycol segments) is the same, and that the increase in domain volume and free volume result from the increase in the Mn of the soft segments when the hard segment content is the same or nearly the saıne. These results demoustrate that positron annihilation lifetime spectroscopy is a sensitive technique to probe the microdomain structure in polymers.

Key words: Positron annihilation, Small angle, X-ray scattering, Scgmented polyether polyurethaneurea, Domain structure, Glass transition te?nperabure