Refined Infrared Spectroscopy to Study Molecular Orientation and Order in Heterogeneous Polymer Systems (B08)

我们将采用先进的红外显微镜和光谱学技术来研究约束对大分子有序性的影响。特别地，我们将（i）使用红外显微镜将联合收割机红外光谱与快速扫描芯片量热法相结合。该装置将允许在相同样品上快速温度淬火后同时测量热容量和IR吸收。这些功能使得相结合的方法非常适合探索均匀成核的分子前体;（ii）新开发的红外过渡矩取向分析方法允许确定特定结构部分的取向，并研究例如外延衬底上的表面诱导结晶。(iii)由于高灵敏度的掠射角IR反射实验允许调查预冻结在中间厚度的膜埋界面。

We will employ advanced techniques of IR microscopy and spectroscopy to study the effect of constraints on the ordering of macromolecules. In particular we will (i) use an IR-microscope to combine IR-spectroscopy with Fast Scanning Chip-Calorimetry. The setup will allow simultaneous measurements of heat capacity with IR-absorption after fast temperature quenches on the identical sample. These features make the combined methods ideally suited to explore the molecular precursors of homogeneous nucleation; (ii) The newly developed method of Infrared transition moment orientational analysis allows to determine the orientation of specific structural moieties and to study e.g. surface induced crystallization on epitaxial substrates. (iii) Due to the high sensitivity grazing angle IR-reflection experiments allow to investigate prefreezing at buried interfaces in films of intermediate thickness.