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Mechanically driven wrinkling instability in thin film polymer bilayers.

J S Sharp¹, K R Thomas, M P Weir

¹School of Physics and Astronomy, University of Nottingham, Nottingham, NG7 2RD, United Kingdom. sharp@nottingham.ac.uk

Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics

|March 16, 2007

Summary

Mechanically induced wrinkling in polymer bilayers is driven by melting semicrystalline underlayers, creating surface corrugations. A model predicts wrinkling wavelengths based on layer properties and strain.

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Single Molecule Methods for Monitoring Changes in Bilayer Elastic Properties

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Area of Science:

Polymer Science
Materials Science
Mechanical Engineering

Background:

Thin film polymer bilayers exhibit complex mechanical behaviors.
Understanding instabilities is crucial for advanced material design.

Purpose of the Study:

Investigate mechanically induced wrinkling in polymer bilayers.
Develop a model to predict wrinkling characteristics.

Main Methods:

Utilized optical microscopy and atomic force microscopy.
Performed linear stability analysis and rheological measurements.

Main Results:

Identified interfacial area changes during underlayer melting as the driving force for wrinkling.
Observed one-dimensional, micrometer-scale surface corrugations.
Developed a model quantitatively predicting wrinkling wavelength dependencies.

Conclusions:

The study provides a model for predicting polymer bilayer wrinkling.
Mechanical properties and strain are key parameters for controlling wrinkling wavelengths.