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Design Rule for Constructing Buckling-Free Polymeric Stencil with Microdot Apertures.

Minju Kim1, Jinwon Lee1, Junsoo Kim2

  • 1Department of Mechanical Engineering, Incheon National University, Incheon 22012, Korea.

Polymers
|December 28, 2021
PubMed
Summary

This study introduces a design rule for creating stable polymeric stencils using polydimethylsiloxane (PDMS) to prevent buckling failure. The research identifies critical buckling pressure based on aspect ratio, improving stencil fabrication.

Keywords:
UV curable polymeraperturebucklingmembranesstructural stability

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Area of Science:

  • Materials Science
  • Mechanical Engineering
  • Polymer Science

Background:

  • Polymeric stencils offer advantages over silicon membranes, including flexibility and lower cost.
  • The deformability of polydimethylsiloxane (PDMS) poses challenges for structural stability and fidelity in microdot aperture fabrication.
  • Existing methods struggle with process failures due to stencil instability under pressure.

Purpose of the Study:

  • To propose a design rule for constructing structurally stable polymeric stencils without process failure.
  • To determine the critical buckling pressure (P) for PDMS stencils with varying aspect ratios (AR).
  • To provide a theoretical framework for predicting stencil stability.

Main Methods:

  • Fabrication of PDMS stencils with microdot apertures using molds with pillar patterns.
  • Systematic variation of mold aspect ratios (AR: 1.6, 2.0, 4.0, 5.3).
  • Experimental observation of buckled morphology and theoretical analysis using Euler's buckling theory and slenderness ratio.

Main Results:

  • PDMS stencils were classified into low (AR 1.6, 2.0) and high (AR 4.0, 5.3) aspect ratio groups based on buckling behavior.
  • Critical buckling pressure (P) decreased with increasing AR within each group.
  • Euler's buckling theory, with a correction factor, accurately predicted experimental results for the high-AR group.

Conclusions:

  • A design rule for PDMS stencil fabrication was established, considering critical buckling pressure and aspect ratio.
  • The study provides insights into the mechanical stability of polymeric microstructures.
  • The findings enable the development of more reliable and high-fidelity polymeric stencils for various applications.