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Competition between phase separation and crystallization in a PCL/PEG polymer blend captured by synchronized SAXS, WAXS, and DSC

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Abstract

We conducted simultaneous, small-angle, X-ray scattering/differential scanning calorimetry (SAXS/ DSC) and simultaneous, wide-angle, X-ray scattering (WAXS)/DSC measurements for a polymer blend of poly(ε-caprolactone)/poly(ethylene glycol) (PCL/PEG). The time-dependent SAXS/DSC and WAXS/DSC results, measured while the system was quenched below the melting temperature of PCL from a melting state, revealed the competitive behavior between liquid-liquid phase separation and crystallization in the polymer blend. The time-dependent structural evolution extracted from the SAXS/WAXS/DSC results can be characterized by the following four stages in the PCL crystallization process: the induction (I), nucleation (II), growth (III), and late (IV) stages. The influence of the liquid-liquid phase separation on the crystallization of PCL was also observed by phase-contrast microscope and polarized microscope with 1/4λ compensator.

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Authors and Affiliations

  1. National Synchrotron Radiation Research Center, 101 Hsin-Ann Road, Hsinchu Science Park, 30076, Hsinchu, Taiwan

    Wei-Tsung Chuang, U-Ser Jeng & Hwo-Shuenn Sheu

  2. Department of Polymer Engineering, National Taiwan University of Science and Technology, 10673, Taipei, Taiwan

    Po-Da Hong

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  1. Wei-Tsung Chuang
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  2. U-Ser Jeng
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  3. Hwo-Shuenn Sheu
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  4. Po-Da Hong
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Correspondence to U-Ser Jeng.

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Chuang, WT., Jeng, US., Sheu, HS. et al. Competition between phase separation and crystallization in a PCL/PEG polymer blend captured by synchronized SAXS, WAXS, and DSC. Macromol. Res. 14, 45–51 (2006). https://doi.org/10.1007/BF03219067

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  • DOI: https://doi.org/10.1007/BF03219067

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