PBb17 セグメント化スペーサーを有する側鎖型液晶性高分子の合成及び熱物性III : 主鎖構造の影響

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We have reported that an introduction of a segmented spacer, which consisted of oligo(ethylene oxide) and alkylene chains, into a polyacrylates enhanced a mobility of a mesogen, and greatly decreased a glass transition temperature, Tg, compared with the case of an ordinary alkylene spacer. In this paper, the other types of polymer-backbones having segmented spacers were prepared, and the influence on thermal properties were studied by using differential scanning calorimetry and polarized optical microscopy. Polyacrylate, polysiloxane and polybenzamide (PAm 1) having cyanobiphenyl side group via segmented spacers exhibited smectic, unknown mesophase and nematic phases, respectively. On the other hand, polystyrene and poly(m-phenylene-terephthalamide) (PAm2) types showed Tg and no mesophases. From these results, it was found that, in the cases of relatively flexible polymer-backbones, mesogenic side groups easily formed assembling structures in very low temperature region. Semi-rigid polystyrene and rigid PAm2 have been well-known as the polymers with helical struc tures, so that mesogenic side groups were affected by the polymer-backbones to show no mesophases. However, the rigid and linear polymer-backbone such as PAml would enable to order the mesogenic side groups.
日本液晶学会の論文
1999-09-28