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A small-angle X-ray scattering study of microphase separation transition of polyurethanes: Effect of hard segments

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Abstract

Three segmented polyurethane block copolymers PU-M, PU-X and PU-T containing different diisocynates, diphenylmethane-4,4'-diisocyanate (MDI), xylene diisocyanate (XDI) and 2,4-toluene diisocyanate (TDI) respectively with the same chain extender 1,4-butanediol (BD) and soft segment polyester-diol were investigated by small-angle X-ray scattering (SAXS). Microphase separation transition (MST) occurred due to the thermodynamic incompatibility between the soft and hard segments. The long domain spacing, interfacial thickness (or transition layer thickness), core zone, and lamellar thickness were determined for these three different polyurethanes from one dimension correlation function after the Fourier transformation of small-angle X-ray scattered intensity curve based on the Strobl and Schneider model. The structural parameters for these three polyurethanes determined from the scattering measurements indicate that the degrees of microphase separation are in the following sequence: PU-M > PU-X > PU-T.

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Authors and Affiliations

  1. Department of Chemical Engineering, National Tsing Hua University, 30043, Hsinchu, Taiwan, ROC

    Kung Linliu & Show-An Chen

  2. Department of Chemical Engineering, Yuan-Ze Institute of Technology, 32026, Nei-Li, Taiwan, ROC

    T. L. Yu

  3. Department of Nuclear Engineering and Engineering Physics, National Tsing Hua University, 30043, Hsinchu, Taiwan, ROC

    Tsang-Lang Lin, Chih-Hao Lee & Ji-Jung Kai

  4. Department of Nuclear Science, National Tsing Hua University, 30043, Hsinchu, Taiwan, ROC

    Szu-Li Chang

  5. Center for Small-Angle Scattering Research, Solid State Division, Oak Ridge National Laboratory, 37831-6377, Oak Ridge, Tennessee, USA

    J. S. Lin

Authors
  1. Kung Linliu
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  2. Show-An Chen
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  4. Tsang-Lang Lin
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  6. Ji-Jung Kai
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Linliu, K., Chen, SA., Yu, T.L. et al. A small-angle X-ray scattering study of microphase separation transition of polyurethanes: Effect of hard segments. J Polym Res 2, 63–70 (1995). https://doi.org/10.1007/BF01493435

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