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.

我们的目标是通过观察薄吸附金层的机械响应来表征偶氮改性光敏物理吸附聚合物薄膜和刷系统的形貌变化期间出现的热化学力。偶氮改性光敏聚合物提供了在固态玻璃态下通过紫外线照射重塑本体聚合物和薄膜的有趣可能性。聚合物在发色团的域形成过程中经历相当大的质量传输。我们对物理吸附光敏薄膜和刷子系统的比较研究表明，在单链动力学受限的刷子中表现出更强的响应。将形貌图案刻入薄膜的力很难通过实验直接评估。然而，我们的结果表明它们可以在薄吸附金层上引起强烈变形。在这项工作中，我们将与 AFM 成像一起采用两种新方法，即共焦拉曼和红外近场技术，用于空间解析混合金聚合物系统的组成，并定量表征可以通过以下方式完成的机械功：不同厚度的金层上的薄膜。接下来，我们还将尝试表征聚合物薄膜本身的化学成分，并获得刻写力起源的详细分子图像。