Technical Information Magazine The TRC News "Analysis of Polymer Phase Separation Structures Using DPC-STEM"

**Abstract**
Differential Phase Contrast (DPC)-STEM, a measurement technique of Scanning Transmission Electron Microscopy (STEM), enables the measurement of electric fields at micro-scale regions. By applying this method to polymer alloys, we discovered that contrast of phase separation structures, which are difficult to observe with conventional electron microscopy, emerges.
**Table of Contents** (Total 4 pages)
1. Introduction
2. Visualization of Soft Materials through Elemental Analysis
3. Application of DPC-STEM Method
4. Conclusion
**Figures**
Figure 1: TEM image of ABS resin, a polymer alloy composed of acrylonitrile-styrene copolymer (AS) and butadiene rubber (BR)
Figure 2: TEM images of a typical polyurethane after RuO4 electron staining and a hard polyurethane after RuO4 electron staining
Figure 3: HAADF-STEM image of unstained ABS resin and EDX maps of N, Mg, and Ca
Figure 4: Schematic diagram of the measurement principle of DPC-STEM
Figure 5: HAADF-STEM image of unstained ABS resin, electric field distribution measured by DPC-STEM, and potential distribution calculated from the electric field distribution

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