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Unlike ionic or small covalent molecules, polymers do not form crystalline solids due to the diffusion limitations of their long-chain structures. However, polymers contain microscopic crystalline domains separated by amorphous domains.
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High-Contrast and Fast Photorheological Switching of a Twist-Bend Nematic Liquid Crystal
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Structural differences between cold- and melt-crystallized poly(trimethylene terephthalate) samples.

Zhen Chen1, Shouke Yan

  • 1State Key Laboratory of Polymer Physics and Chemistry, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China.

Applied Spectroscopy
|March 5, 2013
PubMed
Summary
This summary is machine-generated.

Structural differences in poly(trimethylene terephthalate) (PTT) crystallization were studied. Melt-crystallized PTT shows more stable CH2 segments due to higher chain mobility compared to cold-crystallized PTT.

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Area of Science:

  • Polymer Science
  • Materials Science
  • Spectroscopy

Background:

  • Poly(trimethylene terephthalate) (PTT) is a polyester with unique properties.
  • Understanding crystallization behavior is crucial for tailoring material properties.
  • Cold and melt crystallization processes can lead to different structural arrangements.

Purpose of the Study:

  • To investigate structural differences between cold- and melt-crystallized PTT.
  • To elucidate the arrangement of crystalline chain segments based on crystallization method.
  • To understand the stability of different segments during crystallization.

Main Methods:

  • Time-resolved Fourier transform infrared (FTIR) spectroscopy was employed.
  • Characteristic infrared bands of phenylene, CH2, and C-O-C segments were monitored.
  • Analysis focused on structural changes during cold and melt crystallization.

Main Results:

  • Alignment of phenylene rings and C=O groups is similar in both crystallization methods.
  • Alignment of CH2 segments differs significantly between cold- and melt-crystallized PTT.
  • CH2 segments are more stable in melt-crystallized PTT than in cold-crystallized PTT.

Conclusions:

  • Crystallization environment influences CH2 segment alignment and stability in PTT.
  • Melt crystallization allows higher chain mobility, leading to more stable flexible segments.
  • Cold crystallization restricts CH2 segments, causing cooperative changes and reduced stability.