含X-型和棒型两种液晶基元的主链型系列芳族共聚酯的研究

STUDY OF A SERIES OF AROMATIC COPOLYESTERS WITH X-SHAPED AND ROD-SHAPED MESOGENS IN THE MAIN CHAIN

采用含X-型和棒型液晶基元的两种不同单体,通过改变X-型液晶基元单体的结构和柔性链段长度,经高温溶液缩聚,合成了一系列主链型共聚液晶高分子.研究发现,所有样品都具有很好的热致液晶性及宽广的液晶态温度范围.随单体结构改变,共聚物的相转变温度大致呈规律性变化.

In this paper, two types of mesogenic units, two-dimensional X-shaped and rod-shaped, were copolymerized into the polymer chains. A series of aromatic copolyesters were synthesized by solution polycondensation at the refluxing temperature. The copolymers were all thermotro-pic liquid crystalline. The transition temperatures of the copolymers regularly changed with the substituents in the X-shaped mesogens and with the length of flexible spacers between two mesogens in the chain.