Dünne Filme - Steuerung kristalliner Morphologien über Strukturbildung auf mikroheterogenisierten Oberflächen

薄膜 - 通过微异质化表面上的结构形成来控制晶体形态

• 批准号: 5107844
• 负责人: Privatdozent Dr. Hans-Georg Braun
• 金额: --
• 依托单位: Leibniz-Institut für Polymerforschung Dresden (IPF)
• 依托单位国家: 德国
• 项目类别: Priority Programmes
• 财政年份: 1998
• 资助国家: 德国
• 起止时间: 1997-12-31 至 2003-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/5107844?language=en
• 关键词: nne; Filme; Steuerung; kristalliner; Morphologien

Non-equilibrium growth processes on surfaces produce typical morphological features which are mainly influenced by the diffusion behaviour of components to the growth front of the structural unit. The morphological patterns from diffusion limited aggregation processes are therefore very similar even for very different systems such as the growth patterns from solidification processes or the growth of bacteria on substrates.For crystallisation in thin films of polyethylene in contact with hererogeneous surfaces we found that crystallisation and dewetting appear as competitive processes. Chemically heterogeneous gold surfaces with locally different free surface energies are prepared by micro-contactprinting with 12-undecanthiocarboxylicacid. The films formed on the heterogenized surfaces exhibit different morphological features within the different surface areas. Film morphologies show features characteristic for dewetting as well as for diffusion controlled crystal growth processes. The examination of films is preferently done by AFM and LVSEM.Future experiments focus on a more detailled investigation between the morphological features (including crystallographic fine structure of ultrathin polymer films) which are related to the film formation on heterogenized surfaces with domains of different size ... and shape.Parallel to the crystallisation PE a rigid-rod polymer (Poly-(di-n-hexylsilan)) in ultrathin films on heteronenized surfaces should be investigated. From kinetical investigations of other groups an influence of surface properties of the kinetics has been found and quantified in terms of Avrami kinetics. Our experiments will focus on the question how morphological structures in the Poly-(di-n-hexylsilan) can be influenced by control of the underlying surface.

表面上的非平衡生长过程产生典型的形态特征，其主要受组分向结构单元的生长前沿的扩散行为的影响。因此，即使对于非常不同的系统，例如固化过程的生长模式或细菌在基质上的生长，来自扩散限制聚集过程的形态模式也非常相似。对于与异质表面接触的聚乙烯薄膜中的结晶，我们发现结晶和去湿出现为竞争过程。利用微接触印刷技术，用12-十一烷硫代羧酸制备了具有局部不同表面能的化学非均匀金表面。在异质化表面上形成的膜在不同的表面区域内表现出不同的形态特征。薄膜形貌显示出去湿以及扩散控制晶体生长过程的特征。薄膜的检测主要采用AFM和LVSEM，未来的实验将着重于更详细地研究与不同尺寸畴的异质化表面上的成膜有关的形态特征（包括聚合物薄膜的结晶学精细结构）与膜的形成之间的关系。平行于结晶PE，应该研究在异质化表面上的刚性棒聚合物（聚-（二-正己基硅烷））的非晶薄膜。从其他群体的动力学调查的表面性质的动力学的影响已被发现和量化的Avrami动力学。我们的实验将集中在如何在聚（二正己基硅烷）的形态结构可以通过控制下伏表面的影响的问题。