论文部分内容阅读
用磷酰化反应合成了具有刚性及柔性链段的六种向列中介相嵌段共聚物:PBA/PPD-4,PBA/PPD-6,PBA/PPD-8,,PPTA/PPD-4,PPTA/PPD-6及 PPTA/PPD-8.嵌段共聚物的比浓对数粘度及耐热性与柔性链的长度有关.PBA/柔性链嵌段共聚物在二甲基乙酰胺-3%氯化锂溶液中的液晶性能及溶解性受柔性链长及其在嵌段共聚物中的组分影响.而PPTA 的嵌段共聚物仅能在浓硫酸中显示液晶态。
PBA / PPD-4, PBA / PPD-8, PPTA / PPD-4, PBA / PPD-4 and PBA / PPD-4 were synthesized by phosphorylation reaction with rigid and flexible segments. PPTA / PPD-6 and PPTA / PPD-8. The inherent viscosity and heat resistance of the block copolymer are related to the length of the flexible chain.PBA / flexible chain block copolymer in dimethylacetamide-3% The liquid crystal properties and solubility in lithium chloride solution are affected by the flexible chain length and its composition in the block copolymer, whereas the PPTA block copolymer shows liquid-crystalline state only in concentrated sulfuric acid.