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Journal of Materials Science

, Volume 42, Issue 14, pp 5661–5665 | Cite as

Crystalline-amorphous phase transition of hyperbranched polyurethane phase change materials for energy storage

  • Qi Cao
  • Pengsheng LiuEmail author
Article

Abstract

Hyperbranched polyurethane solid–solid phase change material (HB-PUPCM) has been prepared via a two-step process. The phase transition behaviors and morphologies of these HB-PUPCM films were investigated using differential scanning calorimetry (DSC), wide-angle X-ray diffraction (WAXD) and polarizing optical microscopy (POM). PEG soft segment in the polyurethane was found to be crystalline at room temperature. However, when the temperature was raised to PEG’s melting point, polyurethane did not melt into the liquid state as in the case of pure PEG but changed to an amorphous solid state. In HB-PUPCM, PEG’s molecules probably are tied to the hard segment chain so strongly by the chemical bonds that they cannot change to a liquid state but change to the amorphous state in the transition processing.

Keywords

Differential Scanning Calorimetry Dynamic Mechanical Thermal Analysis Phase Change Material Hard Segment Polarize Optical Microscopy 

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Copyright information

© Springer Science+Business Media, LLC 2007

Authors and Affiliations

  1. 1.College of ChemistryXiangtan UniversityXiangtanP.R. China

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