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Area of Science:

  • Polymer Science
  • Materials Science
  • Crystallization Kinetics

Background:

  • Cationic dyeable polyester (CDP) production faces challenges due to complex crystallization behavior.
  • Polar sulfonate groups influence CDP's stability and processing characteristics.

Purpose of the Study:

  • To investigate the non-isothermal crystallization behavior of CDP with varying sulfonate group content.
  • To understand the impact of sodium isophthalic acid-5-sulfonate (SIPA) on CDP's crystallization kinetics and thermal properties.

Main Methods:

  • Copolyesters synthesized via one-step feeding of SIPA, PTA, and EG.
  • Non-isothermal crystallization analyzed using Differential Scanning Calorimetry (DSC).
  • Crystallization kinetics modeled using Jeziorny, Ozawa, and Mo equations; activation energy determined via Kissinger equation.

Main Results:

  • Increasing SIPA content lowered crystallization temperature and enhanced molecular chain relaxation.
  • Metastable crystals and double melting peaks observed at low cooling rates (2.5-5 °C/min).
  • Cold crystallization peaks appeared at higher cooling rates (10-20 °C/min) due to increased sulfonate aggregation.
  • Nucleation density, growth rate, and activation energy for crystallization decreased with higher SIPA content.

Conclusions:

  • SIPA content significantly affects CDP crystallization behavior, leading to complex thermal transitions.
  • Ionic aggregation of sulfonate groups plays a crucial role in altering chain mobility and crystal formation.
  • Higher SIPA content makes CDP crystallization more difficult, impacting processing stability and material properties.