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This study introduces a new model for strain-induced crystallization in elastomers, explaining hysteresis through polymer aggregation. The model accurately predicts crystallization behavior in natural rubber under various conditions.

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Area of Science:

  • Polymer Science
  • Materials Science
  • Physical Chemistry

Background:

  • Elastomers exhibit strain-induced crystallization, a phenomenon crucial for their mechanical properties.
  • Understanding the thermodynamic and kinetic aspects of this process is essential for material design.
  • Existing models may not fully capture the complex behavior, including hysteresis.

Purpose of the Study:

  • To develop a comprehensive model for strain-induced crystallization in elastomers.
  • To incorporate concepts from micellar solution theory into polymer crystallization.
  • To explain the observed hysteresis in elastomer behavior under strain.

Main Methods:

  • Combining Flory's polymer theory with micellar solution crystallization theory.
  • Developing a model based on the free energy difference between isolated and aggregated polymer segments.
  • Validating the model against experimental data for natural rubber.

Main Results:

  • The proposed model successfully explains strain-induced crystallization in elastomers.
  • Hysteresis is accounted for by changes in free energy due to polymer aggregation.
  • Good qualitative and semiquantitative agreement was achieved with natural rubber crystallization data.
  • The model also qualitatively describes stress hysteresis.

Conclusions:

  • The new model provides a robust framework for understanding strain-induced crystallization and hysteresis in elastomers.
  • It offers insights into the role of polymer aggregation in the crystallization process.
  • The model's predictive capability is demonstrated for natural rubber under varying conditions.