弹性模量

Abstract(#br)The elastic moduli of polystyrene (PS), polymethylmethacrylate (PMMA) and polydimethylsiloxane (PDMS) films were evaluated using an Atomic Force Microscope (AFM) with a steel micro-spherical probe tip. The elastic moduli of the polymeric films were determined with respect to indentation depth using the Hertz and Johnson-Kendall-Roberts (JKR) models. The measured elastic moduli of PS, PMMA and PDMS were determined to be 2.6 GPa, 0.74 GPa, and 4 MPa at indentation depths of 1.7 nm, 4 nm, and 120 nm, respectively.

Abstract(#br)Procedure to establish full contact between the sample and the 1\u003cce:hsp sp=\"0.25\"/\u003emm diameter cylindrical flat punch tip to measure polydimethylsiloxane (PDMS) mechanical properties using the Hysitron TriboIndenter is described. This procedure differs from the standard automated indentation because each indent has to be performed manually after establishing full contact with the sample surface. Incomplete contact happens because of the sample tilt with respect to the flat punch surface and results in incorrect elastic modulus values.

摘要\n人的皮肤与我们日常生活中的各种物质相互作用。人体皮肤与接触材料的相互作用对皮肤接触产品的开发至关重要。由于使用体内或体外皮肤的伦理学和不同的检测结果，开发一种人工皮肤模型( ASM )对研究具有重要意义。因此，在评价人体皮肤行为的基础上，设计了一种模拟人体皮肤变形和摩擦行为的ASM，并研究了其与伤口敷料的摩擦相互作用。\n将亲水网络羧基壳聚糖( CC )与疏水网络聚二甲基硅氧烷( PDMS )结合制备ASM，首先测定PDMS / CC、固化剂/ PDMS配比等配比对ASM力学性能的影响。通过调节固化剂/ PDMS比例，可以控制ASM的吸水膨胀率( WASR )来模拟人体皮肤的不同水化状态。随着配料比和水化程度的改变，ASM的弹性模量和黏弹性可被剪裁为与体内人体皮肤相似。当PDMS / CC比为7∶3，PDMS /固化剂比小于1∶30时，ASM的弹性模量在体内前臂内侧范围内，随着压痕深度的增加，弹性模量降低。基于ASM，研究了皮肤/伤口敷料/床垫之间的摩擦相互作用。研究发现，虽然使用ASM的摩擦力略高于在体前臂内侧，但对于不同种类的伤口敷料，摩擦力下降趋势相同。此外，ASM测试的摩擦力比体内皮肤测试的摩擦力波动小、可靠性高、重复性好，表明ASM适合用于皮肤与产品间摩擦作用的研究，如伤口敷料。

Polydimethylsiloxane (PDMS)를 베이스 기판으로 사용하고 이보다 강성도가 높은 flexible printed circuit board (FPCB)를 island 기판으로 사용하여 island-bridge 구조의 soft PDMS/hard PDMS/FPCB 신축 패키지를 형성하고, 이의 유효 탄성계수와 변형거동을 분석하였다. 각기 탄성계수가 0.28 MPa, 1.74 MPa 및 1.85 GPa인 soft PDMS, hard PDMS, FPCB를 사용하여 형성한 soft PDMS/hard PDMS/FPCB 신축 패키지의 유효 탄성계수는 0.58 MPa로 분석되었다.

Elastic Modulus of Locally Stiffness-variant Polydimethylsiloxane Substrates for Stretchable Electronic Packaging ApplicationsStretchable packaging;stretchable substrate;PDMS;stiffness;elastic modulus;In order to apply to stretchable electronics packaging, locally stiffness-variant stretchable substrates consisting of island structure were fabricated by combining two polydimethylsiloxane elastomers of different stiffnesses and their elastic moduli were characterized as a function of the width of the high-stiffness island.

Deformation Behavior of Locally Stiffness-variant Stretchable Substrates Consisting of the Island StructureStretchable packaging;stretchable substrate;PDMS;stiffness;elastic modulus;In order to develop stretchable substrate technology for stretchable devices, locally stiffness-variant stretchable substrates were processed with two polydimethylsiloxane elastomers of different stiffnesses and their deformation behavior was characterized.

Variation of Elastic Stiffness of Polydimethylsiloxane (PDMS) Stretchable Substrates for Wearable Packaging ApplicationsWearable devices;Wearable packaging;Stretchable substrate;PDMS;Stiffness;Elastic modulus;In order to develop stretchable substrates for wearable packaging applications, the variation behavior of elastic modulus was evaluated for transparent PDMS Sylgard 184 and black PDMS Sylgard 170 as a function of the base/curing agent mixing ratio.

摘要\n提出了一种基于非弹性金属结构和平板弹性聚合物薄膜的压阻式柔性压力传感器，该传感器具有高灵敏度和高达MPa的超大传感范围。在压力加载过程中，金属微结构由于刚性特性不断渗透到聚合物薄膜中，导致压力传感器的接触面积不断变化，压力传感范围超大。引入聚二甲基硅氧烷( PDMS )和聚偏氟乙烯( PVDF )构建柔性压力传感器，实现弹性模量可调的传感性能。压力传感器具有高灵敏度、高灵敏度( PDMS为300   kPa，PVDF为1.4   MPa )、超快响应时间(≈3.5   ms )和高稳定性( \u003e 10   000循环)等优点，在腕部脉搏、人体运动和步态识别等生命体征监测中具有潜在的应用价值。此外，基于所制备的压力传感器构建了加速度传感器，在动作识别、虚拟现实和车辆安全系统中得到了广泛的应用。这项工作为构建高性能压力传感器提供了一种替代策略。

压痕硬度和划痕试验是工业和实验室常用的测定薄膜力学性能的技术。在这里，我们提出测定由具有弹性性质和自修复效应的聚二甲基硅氧烷和聚硅氧烷混合物组成的薄膜的弹性模量和硬度的相对值。本研究利用显微镜和扫描台设计了一种自制的纳米压痕和纳米划痕测试仪，可对弹性模量较低的透明材料进行测量，并可识别薄膜的自修复效应。