用AFM力曲线技术测定聚合物微球的压缩杨氏模量<sup>*</sup>

doi:10.11901/1005.3093.2014.026

材料研究学报

2014, Vol. 28

Issue (7): 509-514 DOI: 10.11901/1005.3093.2014.026

本期目录 | 过刊浏览

用AFM力曲线技术测定聚合物微球的压缩杨氏模量^*

陈杨^1,²,钱程¹,宋志棠^2,³(

),闵国全²

1. 常州大学材料科学与工程学院常州 213164
2. 上海市纳米科技与产业发展促进中心上海 200237
3. 中科院上海微系统与信息技术研究所上海 200050

Measurement of Compressive Young’s Modulus of Polymer Particles Using Atomic Force Microscopy

Yang CHEN^1,²,Cheng QIAN¹,Zhitang SONG^2,^3,^**(

),Guoquan MIN²

1. Department of Material Science and Engineering, Changzhou University, Changzhou 213164
2. Shanghai Nanotechnology Promotion Center, Shanghai 200237
3. Shanghai Institute of Microsystem and Information Technology, Chinese Academy of Sciences, Shanghai 200050

引用本文:

陈杨,钱程,宋志棠,闵国全. 用AFM力曲线技术测定聚合物微球的压缩杨氏模量^*[J]. 材料研究学报, 2014, 28(7): 509-514.
Yang CHEN, Cheng QIAN, Zhitang SONG, Guoquan MIN. Measurement of Compressive Young’s Modulus of Polymer Particles Using Atomic Force Microscopy[J]. Chinese Journal of Materials Research, 2014, 28(7): 509-514.

全文: PDF(3171 KB) HTML

摘要:

用无皂乳液聚合法制备了粒径为200-500 nm的单分散聚苯乙烯(PS)微球。依靠正负电荷间作用力将样品分散在经过亲水处理的硅热氧化片刚性衬底上, 借助原子力显微镜纳米压痕技术测定了PS颗粒样品的力学性质; 依据样品的力-位移曲线, 根据弹性力学接触模型, 计算出PS微球样品的压缩杨氏模量为2-3 GPa (Hertz模型)和2-6 GPa (Sneddon模型)。结果表明, 微球样品的杨氏模量计算值略低于PS块体材料, 且随着粒径的增加而缓慢增大。Hertz模型更适于计算本文制备的亚微米级PS微球的压缩杨氏模量。

关键词 ：材料科学基础学科, 聚苯乙烯微球, 原子力显微镜, 压缩杨氏模量, Hertz模型, Sneddon模型

Abstract：

The monodispersed polystyrene (PS) particles with the size of 200-500 nm were prepared via a soap-free emulsion polymerization method. The as-synthesized PS microspheres were immobilized on a rigid substrate surface through the attraction between the negative-charged silica and the positive-charged PS. The mechanical properties of the as-synthesized PS microspheres were measured by a Peak Force tapping atomic force microscope. The compressive Young’s moduli (E) of 2-3 GPa (Hertz’s model) and 2-6 GPa (Sneddon’s model) were calculated by the analysis of the force-displacement curves captured on the top of the PS particles. The moduli were slightly less than that of PS bulk materials, and the E values increased slowly with an increase of the size of the PS particles. In addition, the Hertz’s model might be more suitable to calculate the E of the obtained samples than the Sneddon’s model.

Key words： foundational discipline in materials science polystyrene microspheres atomic force microscope compressive Young’s modulus Hertz’s model Sneddon’s model

收稿日期: 2014-01-13

基金资助:* 国家自然科学基金 51205032, 江苏省自然科学基金BK2012158, 上海市自然科学基金13ZR1436700和中国博士后科学基金2013M541535资助项目。

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https://www.cjmr.org/CN/10.11901/1005.3093.2014.026 或 https://www.cjmr.org/CN/Y2014/V28/I7/509

图1 不同PVP浓度条件下制备的PS乳胶颗粒样品的SEM照片

图2 PS200和PS350乳胶颗粒在衬底上的AFM形貌

图3 AFM针尖与样品间相对位移和变形示意图[17]

图4 Hertz 和Sneddon接触模型示意图

图5 样品PS200 和PS250 的力-位移曲线和Force-separation曲线

表1 PS微球样品的压缩杨氏模量计算值

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