並列タイトル等ブロック共重合体が形成するシリンダー状ミクロ相分離構造のグレインサイズの定量評価法の確立とグレイン成長に関する研究
一般注記In this dissertation, I focus on grains of cylindrical microdomains in block copolymers. The dissertation consists of three chapters. In Chapter 1, I applied an image processing technique on the basis of the Fourier transform (FT) / inverse FT method to evaluate the grain size observed by transmission electron microscopy (TEM) for the block copolymer in which grains of perpendicularly oriented cylinders exit with slightly different orientation mismatch of the hexagonal lattice. The method reported herein also provided insights of defects and dislocations in such a regularly ordered microdomains. I eventually ascribed the region where such defect-like patterns due to moiré effects are observed to the inclined grain boundary. This grain boundary is considered to be accommodated by chance in the thin section for the TEM observation. In Chapter 2, the quantitative method of evaluation of the grain size using small-angle X-ray scattering (SAXS) was presented. For this purpose, collagen taken from a chicken leg tendon was used as a standard sample to estimate the extent of the instrumental broadening. Then, this method was applied for block copolymer sample in which cylindrical microdomains are oriented perpendicular to the surface of the film specimen. The evaluated value of the grain size was in sufficient accord with the result of the TEM observation as described in Chapter 1, implying the validity of the method proposed in this chapter. In Chapter 3, characterization of the surface morphology was performed by atomic force microscopic (AFM) observation for the thin film specimen of block copolymer sample in which the perpendicularly oriented cylinders are existing. It is found that the cylinder orientation at the surface is also perpendicular. Furthermore, the grain size was successfully evaluated by AFM with the image analysis (as described in Chapter 1). The grain size in the interior of the specimen was also evaluated by SAXS (as described in Chapter 2), and it is found that the grain is slightly larger on the surface than in the interior of the sample. However, this difference might be due to difference in the evaluation methods. Both results for the grain growth on the surface and in the interior of the sample exhibited power-law behavior with the same extent of the growth exponent (~0.45).
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