Shinichi Kawasaki

High Dipsersion Power of Cardo-Typed Fluorene Moieties on Carbon Fillers

Composite materials containing carbon fillers are well used in a variety of material fields including electronic and optical device fields. The carbon fillers are capable of endowing conductivity, heat-releasing ability etc. to the composites. Property indispensable for such matrix resins, as expected for most matrix resins, is to perform high dispersion of the fillers. Surface modification of fillers is one of the straightforward approaches to produce the excellent composite materials. However, if the matrix resin itself can possess good carbon filler dispersing power, it can simply achieve the fine dispersion of a variety of carbon fillers including non-surface modified fillers, making the composite fabrication easy. Currently, much attention has recently focused on the filler-dispersing power of fluorene moieties. In the recent study on polymer materials based on fluorene based polymer (FBP), we have found that FBP shows not only a much filler-incorporating ability but also an excellent filler-dispersing ability for carbon fillers, suggesting that FBP is a highly suitable matrix resin for carbon fillers. In this chapter, we discussed the interesting nature of FBP as matrix resin that shows extremely high carbon filler-incorporating and dispersing powers to yield high quality composite materials, along with the investigation on the interaction based on the structural characteristics of 9,9-diarene-substituted fluorene skeleton of FBP.

Preparation and optical properties of doubly-oriented poly-(di-methyl-silane) films

Doubly-oriented films of poly-(di-methyl-silane) (PDMS) were prepared by evaporation under controlled conditions on unidirectionally oriented poly(tetra-fluoro-ethylene) (PTFE) thin layer, which was mechanically deposited on fused quartz plate. It was confirmed by X-ray diffraction and polarized absorption measurements that the silicon backbone chains with all-trans conformation laid along the direction of PTFE orientation, and that a particular crystalline plane (110) was parallel to the PTFE layer. PDMS films with double orientation showed a new absorption which appeared only in the polarized spectrum parallel to the direction of chains, and in lower energy region, than the main peak at 4.1 eV.