Stiffness, strength and adhesion characterization of electrochemically deposited conjugated polymer films.
Stiffness, strength and adhesion characterization of electrochemically deposited conjugated polymer films.
复制标题
DOI：
10.1016/j.actbio.2015.11.018
复制
发表时间：
2016-02
影响因子：
9.7
通讯作者：
Martin DC
中科院分区：
文献类型：
--
作者：
Qu J;Ouyang L;Kuo CC;Martin DC
共轭聚合物如聚（3，4-亚乙基二氧基噻吩）（PEDOT）对于包括电子生物医学装置和活组织之间的界面的各种应用是令人感兴趣的。这些材料的机械性能、强度和对固体基材的附着力对于长期应用至关重要。我们一直在开发方法来量化共轭聚合物薄膜的机械性能。在这项研究中，刚度，强度和界面剪切强度（粘附力）的电化学沉积PEDOT和PEDOT-co-1，3，5-三[2-（3，4-乙撑二氧噻吩）]-苯（EPh）进行了研究。PEDOT膜的估计杨氏模量为2.6 ± 1.4GPa，并且失效应变为约2%。测得拉伸强度为56 ± 27 MPa。有效的界面剪切强度估计与剪切滞后模型通过测量作为膜厚度的函数的裂纹间距。对于在金/钯涂覆的烃膜基底上的PEDOT，测定了0.7 ± 0.3MPa的界面剪切强度。添加5摩尔%的三官能EDOT交联剂（EPh）将膜的拉伸强度增加至283 ± 67 MPa，而断裂应变保持大致相同（2%）。有效界面剪切强度提高到2.4 ± 0.6MPa。
Conjugated polymers such as poly(3,4-ethylenedioxythiphene) (PEDOT) are of interest for a variety of applications including interfaces between electronic biomedical devices and living tissue. The mechanical properties, strength, and adhesion of these materials to solid substrates are all vital for long-term applications. We have been developing methods to quantify the mechanical properties of conjugated polymer thin films. In this study the stiffness, strength and the interfacial shear strength (adhesion) of electrochemically deposited PEDOT and PEDOT-co-1,3,5-tri[2-(3,4-ethylene dioxythienyl)]-benzene (EPh) were studied. The estimated Young’s modulus of the PEDOT films was 2.6 ± 1.4 GPa, and the strain to failure was around 2%. The tensile strength was measured to be 56 ± 27 MPa. The effective interfacial shear strength was estimated with a shear-lag model by measuring the crack spacing as a function of film thickness. For PEDOT on gold/palladium-coated hydrocarbon film substrates an interfacial shear strength of 0.7 ± 0.3 MPa was determined. The addition of 5 mole% of a tri-functional EDOT crosslinker (EPh) increased the tensile strength of the films to 283 ± 67 MPa, while the strain to failure remained about the same (2%). The effective interfacial shear strength was increased to 2.4 ± 0.6 MPa.