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This study reveals how heating poly(ether-b-amide) (PEBA) segmented copolymers affects their structure and properties. Above a critical temperature, irreversible crosslinking dominates, significantly altering rheological, crystallization, and mechanical behaviors.

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Area of Science:

  • Polymer Science
  • Materials Science
  • Rheology

Background:

  • Poly(ether-b-amide) (PEBA) segmented copolymers exhibit complex behavior due to microphase separation.
  • Understanding temperature-dependent structural evolution is crucial for material applications.

Purpose of the Study:

  • To investigate the temperature dependence of PEBA rheological properties under oscillatory shear flow.
  • To elucidate the roles of microphase separation and crosslinking in microstructural evolution.

Main Methods:

  • Oscillatory shear rheology was employed to study PEBA samples at varying temperatures.
  • Dynamic storage modulus was analyzed to determine microstructural changes.
  • Key transition temperatures (T_cross) were identified.

Main Results:

  • Microphase separation and irreversible crosslinking significantly influence the dynamic storage modulus.
  • Heating above T_cross leads to dominant crosslinking, altering microstructure.
  • Increased crosslinking enhances strain hardening during uniaxial stretching.

Conclusions:

  • PEBA microstructure evolution upon heating can be categorized into three domains: homogenous, microphase separation dominating, and crosslinking dominating.
  • Irreversible crosslinking above T_cross impacts rheological, crystallization, and mechanical properties.
  • Crosslinking content is a key factor in PEBA's mechanical performance.