Nanoscopic mechanical tests for characterizing forces during UVinitiated mass transport in photosensitive polymer films

纳米机械测试，用于表征光敏聚合物薄膜中紫外线引发的传质过程中的力

• 批准号: 196287691
• 负责人: Professorin Dr. Martina Havenith-Newen
• 金额: --
• 依托单位: Lehrstuhl für Physikalische Chemie II: Laserspektroskopie und Biophotonik
• 依托单位国家: 德国
• 项目类别: Priority Programmes
• 财政年份: 2011
• 资助国家: 德国
• 起止时间: 2010-12-31 至 2016-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/196287691?language=en
• 关键词: Nanoscopic; mechanical; tests; characterizing; forces

We aim at characterizing the thermochemical forces emerging during topography changes of azo-modified photosensitive physisorbed polymer films and brush systems by looking at the mechanical response of thin adsorbed gold layers. Azo-modified photosensitive polymers offer the interesting possibility to reshape bulk polymers and thin films by UV-irradiation while being in the solid glassy state. The polymer undergoes considerable mass transport during domain formation of chromophores. Our comparative studies on physisorbed photosensitive thin films and brush systems indicate, that in brushes with their restricted dynamics of single chains show a much stronger response. The forces inscribing a topographical pattern into a thin film are hard to assess experimentally directly. Our results, however, indicate that they can give rise to strong deformation on thin adsorbed gold layers. In this work, we are going to employ, along with AFM imaging, two new methods, confocal Raman and IR-nearfield techniques, for spatially resolving the composition of the hybrid gold-polymer system and quantitatively characterize the mechanical work that can be done by a film on gold layers of varying thickness. In the following, we shall also attempt to characterize the chemical composition of the polymer film itself and arrive at a detailed molecular picture of the origin of inscribing forces.

我们的目的是表征热化学力出现在拓扑结构变化的偶氮改性的光敏物理吸附的聚合物薄膜和刷系统通过看薄吸附金层的机械响应。偶氮改性的光敏聚合物提供了有趣的可能性，通过紫外光照射，而在固体玻璃态下重塑块体聚合物和薄膜。聚合物在发色团的结构域形成期间经历相当大的质量传递。我们对物理吸附的光敏薄膜和刷系统的比较研究表明，在具有单链限制动力学的刷中显示出更强的响应。将形貌图案刻入薄膜中的力很难通过实验直接评估。然而，我们的研究结果表明，它们可以引起强烈的变形薄吸附金层。在这项工作中，我们将采用，沿着与AFM成像，两种新的方法，共焦拉曼和红外近场技术，用于空间分辨的混合金-聚合物系统的组合物和定量表征的机械工作，可以由不同厚度的金层上的膜完成。在下文中，我们还将尝试表征聚合物膜本身的化学组成，并得出关于内切力起源的详细分子图像。