Synthesis and characterization of a new chitosan derivatives with liquid crystalline behavior - O-cyanoethylchitosan
- 化学化工－已发表论文 
O-cyanoethylchitosan was prepared at room temperature using sodium hydroxide as catalyst. Solubility of O-cyanoethylchitosan was prior to chitosan. While it dissolved, O-cyanoethylchitosan formed typical cholesteric liquid crystalline texture - fingerprint texture, The fingerprint texture can be frozen in films casted from 5% aqueous acetic acid solution. The droplet texture of positive birefriengence can also be observed in these films, Critical concentrations of cyanoethylchitosan in four acidic solvents were determined using polarized microscopy. All critical concentration values were in the range of 19%similar to 20%(volume fraction), independing of the acidity of solvents.