芳香─脂肪族共聚酰胺的序列结构和溶致液晶性能

SEQUENCE STRUCTURE AND LYOTROPIC LIQUID CRYSTALLINE PROPERTIES OF AROMATIC-ALIPHATIC COPOLYAMIDES

本文利用对苯二甲酰氯（ＴＰＣ），对苯二胺（ＰＰＤ）和亚甲基数为２和６的两种脂肪族二元胺（ＡＤＡ）合成了具有不同序列结构的芳香一脂肪族共聚酰胺．研究了共聚酰胺的序列结构参数──无规度Ｂ和数均序列长度Ｌｎ与液晶临界浓度Ｃ＊和中介相的类型之间的关系．

n present paper the aromatic-aliphatic copolyamides with different sequencestructure were synthesize from tefrphthalyl chloride (TPC),p-phenylenediamine (PPD ) and aliphatic diamine (ADA, H2N - (CH2)n -NH2,n=2, 6 ). The relationship between sequence structure of copolyamides, includingrandom degree (B) and number average sequence length (Ln), and the lyotropicliquid crystalline properties, including critical concentration (C*) and the type ofmesogenic phase was studied. The results show that the critical concentration ofthe liquid crystalline copolyamides moreses with the raise of B and decress of L.and the mesogenic pharos of copely amides transform from nematic to smectic asthe LnA / Lnp is approximately equal to 0.20.