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Unwinding globules under tension and polymer collapse
1Institut de Recherche sur les Phénomènes Hors Equilibre, 49, rue F. Joliot-Curie, Boîte Postale 146, 13384 Marseille, France. frisch@irphe.univ-mrs.fr
Summary
Polymer collapse involves pearl-like structures. Molecular dynamics reveal a sharp transition from compact globule to stretched states under force, with critical force scaling with chain length.
Area of Science:
- Polymer Physics
- Soft Matter Physics
- Computational Chemistry
Background:
- Polymer collapse is a fundamental process in polymer science.
- Pearl-like structures are known intermediates during polymer collapse.
- Understanding polymer behavior under tension is crucial for material science.
Purpose of the Study:
- To investigate the transition of polymer globules under external stretching forces.
- To determine the relationship between globule size, force, and chain length.
- To model the critical force required for globule unwinding.
Main Methods:
- Molecular dynamics simulations were employed.
- The study varied external stretching force and polymer chain length.
- A theoretical model for the globule-chain system was developed.
Main Results:
- A strong first-order-like transition from compact globule to stretched states was observed.
- Globule size was analyzed as a function of applied force and chain length.
- The critical force for globule unwinding follows N(1/3) scaling with the number of monomers (N).
Conclusions:
- Polymer globules exhibit a distinct transition under sufficient stretching force.
- The critical force for unwinding demonstrates a predictable scaling relationship with polymer chain length.
- The findings provide insights into polymer elasticity and phase transitions.