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首页> 外文期刊>Journal of Materials Research >Nanoindentation of polydimethylsiloxane elastomers: Effect of crosslinking, work of adhesion, and fluid environment on elastic modulus
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Nanoindentation of polydimethylsiloxane elastomers: Effect of crosslinking, work of adhesion, and fluid environment on elastic modulus

机译：聚二甲基硅氧烷弹性体的纳米压痕：交联，粘合功和流体环境对弹性模量的影响

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摘要

With the potential to map mechanical properties of heterogeneous materials on a micrometer scale, there is growing interest in nanoindentation as a materials characterization technique. However, nanoindentation has been developed primarily for characterization of hard, elasto-plastic materials, and the technique has not been validated for very soft materials with moduli less than 5 MPa. The current study attempted to use nanoindentation to characterize the elastic moduli of soft, elastomeric polydimethylsiloxane (PDMS) samples (with different degrees of crosslinking) and determine the effects of adhesion on these measurements using adhesion contact mechanics models. Results indicate that nanoindentation was able to differentiate between elastic moduli on the order of hundreds of kilo-Pascals. Moreover, calculations using the classical Hertz contact model for dry and aqueous environment gave higher elastic modulus values when compared to those obtained from unconfined compression testing. These data seem to suggest that consideration of the adhesion energy at the tip-sample interface is a significantly important parameter and needs to be taken into account for consistent elastic modulus determination of soft materials by nanoindentation.
机译：具有在微米尺度上绘制异质材料力学性能的潜力，人们越来越关注纳米压痕作为材料表征技术。但是，纳米压痕技术主要是针对硬质弹塑性材料的表征而开发的，该技术尚未针对模量小于5 MPa的非常软的材料进行验证。当前的研究试图使用纳米压痕来表征柔软的，弹性的聚二甲基硅氧烷（PDMS）样品（具有不同的交联度）的弹性模量，并使用粘合接触力学模型确定粘合对这些测量的影响。结果表明，纳米压痕能够区分几百千帕斯卡的弹性模量。此外，与从无限制压缩测试获得的弹性模量值相比，使用经典的Hertz接触模型进行的干燥和水性环境计算得出的弹性模量值更高。这些数据似乎表明，考虑到尖端样品界面处的粘附能是一个非常重要的参数，并且需要通过纳米压痕法对软材料进行一致的弹性模量测定时予以考虑。

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  • 来源
    《Journal of Materials Research》 |2005年第10期|p.2820-2830|共11页
  • 作者

    Fernando Carrillo; Shikha Gupta; Mehdi Balooch;

  • 作者单位

    Department of Orthopaedic Surgery, University of California-San Francisco, San Francisco, California 94110;

    and Department of Chemical Engineering, EUETIT -Polytechnic University of Catalonia, Terrassa E-08222, Spain;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 工程材料学;
  • 关键词

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