用AFM力曲线技术测定聚合物微球的压缩杨氏模量.docxVIP

第 28 卷 第 7 期 2 0 1 4 年 7 月 材 料 研 究 学 报 CHINESE JOURNAL OF MATERIALS RESEARCH Vol. 28 No. 7 July 2 0 1 4 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 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 分类号 TB324, TB383 文章编号 1005-3093(2014)07-0509-06 Measurement of Compressive Young’s Modulus of Polymer Particles Using Atomic Force Microscopy CHEN Yang1, 2 QIAN Cheng1 SONG Zhitang2, 3** MIN Guoquan2 Department of Material Science and Engineering, Changzhou University, Changzhou 213164 Shanghai Nanotechnology Promotion Center, Shanghai 200237 Shanghai Institute of Microsystem and Information Technology, Chinese Academy of Sciences, Shanghai 200050 *Supported by National Natural Science Foundation of China No. the Natural Science Foundation of Ji- angsu Province of China No. BK2012158, the Shanghai Municipal Natural Science Foundation No. 13ZR1436700 and China Postdoctoral Science Foundation No. 2013M541535. Manuscript received January 13, 2014; in revised form February 16, 2014. **To whom correspondence should be addressed, Tel: (021 E-mail: HYPERLINK mailto:cy.jpu@126.com cy HYPERLINK mailto:.jpu@126.com .jpu@126.com 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.