不同联苯类液晶基元对改性超支化聚羟甲基醚液晶性的影响

Effects of Different Types of Biphenyl Mesogenic Units on the Liquid Crystal Properties of Functionalized Hyperbranched Poly(hydroxymethyl)Ethers

合成了不同联苯类液晶基元 ,对超支化聚羟甲基醚进行改性 .采用红外 ,核磁确定液晶基元的结构 ,通过POM ,DSC的研究表明 ,改性超支化聚羟甲基醚表现出液晶性 ,且为向列型液晶 ,不同联苯类液晶基元对改性超支化聚羟甲基醚液晶性有较大的影响 .

The liquid crystalline hyperbranched poly(hydroxy methyl)ethers were synthesized with three types of biphenyl mesogenic units. Their flexible spacers were decyl and the biphenyl mesogenic units respectively. The chemical structures of the mesogenic units were proved with 1 H-NMR, IR and elemental analysis. The phase transition and liquid crystallinity of the functionalized hyperbranched poly(hydroxy methyl)ethers were investigated with POM, DSC and WAXD. The experimental results indicated that the functionlized hyperbranched polyether showed nematic texture and the temperature rang of nematic phase was greatly affected by the mesogenic units.