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DNA Nanotubes as a Versatile Tool to Study Semiflexible Polymers

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Bio-inspired micro-to-nanoporous polymers with tunable stiffness.

Julia Syurik¹, Ruth Schwaiger², Prerna Sudera¹

¹Institute for Microstructure Technology, Karlsruhe Institute of Technology (KIT), Hermann-von-Helmholtz-Platz 1, 76344 Eggenstein-Leopoldshafen, Germany.

Beilstein Journal of Nanotechnology

|May 16, 2017

Summary

Researchers created graded porous polymer structures inspired by nature. Increasing pore area surprisingly increased storage modulus, explained by thicker pore walls, offering a non-chemical method to tune polymer properties.

Keywords:

biomimetics polymeric materials supercritical carbon dioxide (SC-CO2)tunable storage modulus

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Area of Science:

Materials Science
Polymer Science
Nanotechnology

Background:

Inspired by biological materials' structural hierarchies and mechanical properties.
Developed a smoothly graded micro- to nanoporous structure from a thermoplastic polymer.

Purpose of the Study:

Investigate the viscoelastic properties of polymers with varying pore sizes.
Understand the relationship between pore structure and mechanical behavior.

Main Methods:

Dynamic flat-punch indentation used to probe viscoelastic properties.
Quantitative analysis of the pore structure to determine pore wall thickness.

Main Results:

Storage modulus increased with increasing pore-area fraction, an initially counterintuitive finding.
Viscoelastic properties were investigated in the glassy regime.

Conclusions:

The increase in storage modulus is attributed to increased pore wall thickness.
This approach offers a non-chemical method to tune elastic properties of polymers.
Adjusting the pore size gradient allows for control over local variations in elastic properties.