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Fabrication of Large-area Free-standing Ultrathin Polymer Films
Published on: June 3, 2015
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Highly Deformable, Ultrathin Large-Area Poly(methyl methacrylate) Films
Maria F Pantano1, Christos Pavlou2,3, Maria Giovanna Pastore Carbone2
1Department of Civil, Environmental and Mechanical Engineering, University of Trento, Via Mesiano 77, 38123 Trento, Italy.
ACS Omega
|April 5, 2021
Summary
This study investigated ultrathin poly(methyl methacrylate) (PMMA) films, finding they exhibit surprisingly high strain at failure despite bulk-like stiffness. This research could lead to developing ductile glassy thermoplastic films at room temperature.
Area of Science:
- Materials Science
- Polymer Science
- Nanotechnology
Background:
- Poly(methyl methacrylate) (PMMA) is a widely used glassy engineering polymer.
- Recent research has explored combining PMMA thin films with 2D materials for nanotechnology applications.
- The influence of film thickness on PMMA's mechanical properties remains underexplored.
Purpose of the Study:
- To investigate the yielding and fracture characteristics of ultrathin PMMA films.
- To assess the effect of size on the mechanical behavior of freestanding PMMA films.
- To explore the potential for developing highly ductile glassy thermoplastic films.
Main Methods:
- Utilized a custom-built nanomechanical device for tensile testing.
- Examined freestanding PMMA films with thicknesses ranging from 180 to 280 nm.
- Performed detailed optical microscopy during tensile loading to observe failure mechanisms.
Main Results:
- Young's modulus and yield strength of ultrathin films were comparable to bulk PMMA.
- All tested PMMA films demonstrated a remarkably high strain at failure (>20%).
- Optical examination revealed craze development that did not result in immediate fracture.
Conclusions:
- Ultrathin PMMA films exhibit enhanced ductility compared to bulk material.
- Craze formation in PMMA films can accommodate significant strain without premature failure.
- This study provides a foundation for creating ductile glassy thermoplastic films for various applications.
