Research on Surface Mechanical Properties of Polydimethylsiloxane Stamp Microstructures in Self-diffusion Process

Xu-ting Xia; Jun Ren; Yu-han Yang; Yu Liu; Xiao-long Wang

doi:10.11777/j.issn1000-3304.2022.22379

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Research on Surface Mechanical Properties of Polydimethylsiloxane Stamp Microstructures in Self-diffusion Process

Research Article | 更新时间：2023-06-21

- Research on Surface Mechanical Properties of Polydimethylsiloxane Stamp Microstructures in Self-diffusion Process
- ACTA POLYMERICA SINICA Vol. 54, Issue 7, Pages: 1113-1121(2023)
- 作者机构：
  
  1.江南大学机械工程学院无锡 214122
  2.中国科学院兰州化学物理研究所兰州 730000
- 作者简介：
  
  Yu Liu, E-mail: yu.liu@vip.163.com
  Xiao-long Wang, E-mail: wwangxl@licp.cas.cn
- 基金信息：
- DOI：10.11777/j.issn1000-3304.2022.22379
  CLC：
- Published：20 July 2023，
  
  Published Online：24 February 2023，
  
  Received：25 November 2022，
  
  Accepted：18 January 2023
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夏栩婷,任俊,杨彧涵等.自扩散过程中聚二甲基硅氧烷印章微结构表面力学性能研究[J].高分子学报,2023,54(07):1113-1121.

Xia Xu-ting,Ren Jun,Yang Yu-han,et al.Research on Surface Mechanical Properties of Polydimethylsiloxane Stamp Microstructures in Self-diffusion Process[J].ACTA POLYMERICA SINICA,2023,54(07):1113-1121.
夏栩婷,任俊,杨彧涵等.自扩散过程中聚二甲基硅氧烷印章微结构表面力学性能研究[J].高分子学报,2023,54(07):1113-1121. DOI： 10.11777/j.issn1000-3304.2022.22379.

Xia Xu-ting,Ren Jun,Yang Yu-han,et al.Research on Surface Mechanical Properties of Polydimethylsiloxane Stamp Microstructures in Self-diffusion Process[J].ACTA POLYMERICA SINICA,2023,54(07):1113-1121. DOI： 10.11777/j.issn1000-3304.2022.22379.

摘要

为了探究微接触印刷时，有机溶剂在聚二甲基硅氧烷(PDMS)内部微纳孔隙中自扩散对PDMS印章表面微结构的影响，制备了一系列具有不同高宽比微结构、不同墨水含量以及不同交联剂比例的PDMS印章，并进一步揭示了高宽比、墨水自扩散程度以及交联剂比例对印章表面微结构的模量、黏附力和几何尺寸的影响. 该结果可用于作为制备具有较高结构稳定性和印刷精度的PDMS弹性印章的参考基础.

Abstract

In micro-contact printing

the structural stability and shape accuracy of the elastomeric stamp are critical for structural printing with high resolution and precision. When printing alkanethiols on gold surfaces

the self-diffusion phenomenon of organic solvents occurring in the micro-nano pores inside polydimethylsiloxane (PDMS) during the ink dipping process tends to change the mechanical properties and geometry of the stamp

thus affecting the accuracy and effectiveness of the printed patterns. In order to investigate the effect of this self-diffusion phenomenon on the microstructure of the PDMS stamp surface

PDMS stamps with microstructure patterns of different aspect ratios were prepared by casting off on a lithographic silicon wafer template. PDMS stamps with different HDT mass fractions were prepared by immersing the PDMS stamps in 1-hexadecanethiol (HDT) and by controlling the time of self-diffusion of HDT inside PDMS

and based on optical microscopy

scanning electron microscopy (SEM) and atomic force microscopy (AFM) measurements

the effects of the self-diffusion process on the structural stability of the stamp microstructures

surface adhesion and the shape accuracy of the patterns. The results show that the self-diffusion of HDT causes a decrease in both the modulus and adhesion of the PDMS stamped microstructure

and the structural stability of the microstructure with an aspect ratio of 1:1 is relatively best. Secondly

the longer the time of self-diffusion

the higher the content of HDT inside the PDMS

the greater the decrease in the modulus and adhesion of the microstructure

and the higher the shape expansion of its pattern. In addition

the effect of curing agent content on the Young's modulus and adhesion force of PDMS stamp microstructures was investigated by varying the ratio of prepolymer to curing agent. The results can be used as a reference basis for the preparation of PDMS elastic stamps with high structural stability and printing accuracy.

关键词

微接触印刷自扩散聚二甲基硅氧烷原子力显微镜结构稳定性

Keywords

Micro-contact printingSelf-diffusionPolydimethylsiloxaneAtomic force microscopyStructural stability

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National Engineering Research Center for Advanced Polymer Processing Technology, Zhengzhou University

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