论文部分内容阅读
The synthesis and mesomorphic properties of a new class of liquid crystalline cyclotriphosphazenes with rigid cyanostilbene groups and flexible alkoxy groups are reported.The thermal behaviors of cyclotriphosphazene derivatives 5a-5d are studied by the means of differential scanning calorimetry,polarizing optical microscopy.Nematic phases were observed in compounds 5a-5d both on heating and cooling.The clear temperatures of compounds 5a-5d slightly increased with increasing length of terminal alkyl chain.Compounds 5a-5d showed different mesogenic region from minimum 5℃to maximum 142℃.
The synthesis and mesomorphic properties of a new class of liquid crystalline cyclotriphosphazenes with rigid cyanostilbene groups and flexible alkoxy groups are reported. Thermal behaviors of cyclotriphosphazene derivatives 5a-5d are studied by the means of differential scanning calorimetry, polarizing optical microscopy. Nematic phases were observed in compounds 5a-5d both on heating and cooling. The clear temperatures of compounds 5a-5d slightly increased with increasing length of terminal alkyl chain. Compounds 5a-5d showed different mesogenic region from minimum 5 ° C to maximum 142 ° C.