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Soft-and hard-segment phase segregation of polyester-based polyurethane

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Abstract

Polyester based polyurethanes were synthesized from 4,4′-methylene bis(phenyl isocyanate) (MDI) with butanediol as a chain extender and low molecular weight polyester-diol as a soft segment. Three polyesters were used in the synthesis of polyurethanes. Two of the polyesters, with molecular weight Mn = 2,660 and 2,155, were synthesized from adipic acid and 1,6-hexanediol, which had an even number of carbon atoms (polyester-6-6-1 and polyester-6-6-2). The other polyester with Mn = 2,770 was synthesized from pimelic acid and 1,5-pentanediol, which had an odd number of carbon atoms (polyester-7-5). Polyester-6-6-1 and polyester-6-6-2 consisting of even carbon monomers, had a higher degree of crystallinity at room temperature than polyester-7-5, which consists of an odd number of carbon monomers. The effect of polyester molecular weight and soft and hard-segmental geometric structure on the soft-and hard-segmental phase segregation was studied using differential scanning calorimetry (DSC), Fourier transform infrared spectroscopy (FTIR), and small angle X-ray scattering (SAXS).

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Authors and Affiliations

  1. Department of Chemical Engineering, Yuan-Ze University, Taoyuan, Nei-Li, 32026, Taiwan

    Kun-San Chen, T. Leon Yu & Yung-Sin Chen

  2. Department of Engineering and System Science, National Tsing-Hua University, Hsinchu, 30043, Taiwan

    Tsang-Lang Lin & Wen-Jiun Liu

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  1. Kun-San Chen
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  2. T. Leon Yu
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  3. Yung-Sin Chen
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Correspondence to T. Leon Yu.

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Chen, KS., Leon Yu, T., Chen, YS. et al. Soft-and hard-segment phase segregation of polyester-based polyurethane. J Polym Res 8, 99–109 (2001). https://doi.org/10.1007/s10965-006-0139-3

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  • DOI: https://doi.org/10.1007/s10965-006-0139-3

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