自己着色ヒドロキシプロピルセルロースコレステリック橋かけ固体膜の調製
1995 年 51 巻 8 号 p. 368-374
詳細
1995 年 51 巻 8 号 p. 368-374
In order to obtain the basic data for preparation of self-coloring cholesteric films based on crosslinked hydroxypropyl cellulose (HPC). we prepared the HPC liquid crystalline solution and investigated the effects of HPC concentration, temperature and addition of surfactant on the wavelength of reflective light (λ) by spectrophotometry in the concentration range of 58 to 66wt%. The value of λ decreased with HPC concentration and increased with temperature. The pitch of cholesteric helix (P) was derived from measurements of mean refractive indices and of λ. The dependence of P on the HPC concentration (Cv, in volume fraction) was investigated at 20°C; The reciprocal of P was proportional to Cv427 in the region below Cv=0.57, whereas that was proportional to Cv2.35 in the region above Cv=0.57. The power index also depended on the temperature.
Regardless of the surfactant type (anionic, cationic and nonionic), the effect of surfactant on the value of λ depended on the HPC concentration and temperature.
The homogeneous blue and heterogeneous red solid films could be cast and the color of films strongly depended on the cast conditions. The self-coloring solid films should be prepared at higher temperature.
