液晶聚氨酯纳米阵列的制备

Preparation of Liquid Crystal Polyurethane Nanoarrays

采用4,4′– 二羟基联苯和6– 氯–1– 己醇为原料合成液晶中间体BHHBP6,再将其与异佛尔酮二异氰酸酯反应,制备出具有液晶结构的聚氨酯,最后通过多孔氧化铝模板熔融法,利用不同模板孔径制成不同直径的纳米阵列。采用核磁共振波谱仪、傅立叶变换红外光谱仪、差示扫描量热仪、偏光显微镜、扫描电子显微镜和透射电子显微镜对材料的结构、形貌和性能进行了表征。结果发现液晶基元BHHBP6 的熔点和清亮点分别在96.92℃和174.98℃,相转变区间较宽;由BHHBP6 制备的聚氨酯具有热致液晶性;熔融法制备的液晶聚氨酯纳米阵列表面光滑、尺寸均一。

First,the mesogenic unit BHHBP6 was synthesized with 4,4′-dihydroxybiphenyl and 6-chloro-1-hexanol. Then the liquid crystal polyurethane was prepared by the reaction of BHHBP6 with isophorone diisocyanate. Finally,liquid crystal polyurethane nanoarrays with different diameters were synthesized by the porous anodized aluminum oxide membrane as template. The structure,morphology and properties of the materials were characterized by nuclear magnetic resonance spectrometer,Fourier transform infrared spectroscopy,differential scanning calorimetry,polarized optical microscopy,scanning electron microscope and transmission electron microscopy. The results show that the melting point and clearing point of the mesogenic unit BHHBP6 are 96.92℃ and 174.98℃,respectively,and the phase transition interval is wide. The polyurethane prepared by BHHBP6 has thermotropic liquid crystallinity,and the liquid crystal polyurethane nanoarrays prepared by melting method have smooth surface and uniform size.