Fiber Network Formation in Semi-Flexible Polymer Solutions: An Exploratory Computational Study
Fernando Vargas-Lara1, Jack F Douglas2
1Materials Science and Engineering Division, National Institute of Standards and Technology, Gaithersburg, MD 20899, USA. fernando.vargaslara@nist.gov.
Gels (Basel, Switzerland)
|January 25, 2019
Summary
This study explores how semi-flexible polymer chains bundle to form gels. Increased bundling strengthens fibers, raising their melting point and rigidification, suggesting kinetic selection of fiber size.
Area of Science:
- Polymer physics
- Materials science
- Soft matter physics
Background:
- Gel formation via polymer chain bundling is common in nature and industry.
- Understanding the relationship between fiber structure and gel properties is crucial.
Purpose of the Study:
- To investigate the essential features of gel formation in semi-flexible polymers.
- To explore how fiber bundling influences gel melting temperature and rigidity.
Main Methods:
- Exploratory molecular dynamics simulations of a coarse-grained polymer model.
- Simulations in a solution with attractive lateral interchain interactions.
- Analysis of fibrous gel formation and properties.
Main Results:
- The model successfully generated fibrous gels resembling real-world examples.
- Investigated the influence of fiber bundling extent on melting temperature (Tm) and fiber rigidification.
- Observed progressive rigidification of bundled fibers with increasing chain numbers (N).
Conclusions:
- Fiber size in these gels appears to be kinetically selected.
- Reduced thermodynamic driving force and slowed dynamics contribute to rigidification.
- The findings offer insights into the self-assembly of fibrous polymer gels.
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