Rigid fluorine-containing compounds, monomers, and polymers based on pentacyclic core systems, such as 12H,14H-5,7-dioxapentacene of formula (I) with perfluoroalkyl and/or aryl groups in the 12, 14 positions, and 5H,12H-7,14-dioxapentacene, of formula (II) with perfluoroalkyl and/or aryl groups in the 5,12 positions. These monomers have utility in the preparation of advanced high-performance polymers, particularly polyimides. The rigid pentacyclic core decreases the coefficient of thermal expansion of the polymers, while the fluorinated substituents improve the dielectric constant and water absorption properties. Each monomer unit contains within its pentacyclic core two-O-bridges, and two -CRRf bridges (where R is aryl, substituted aryl or perfluoroalkyl, and Rf is perfluoroalkyl).
基于五环核心系统的硬质含
氟化合物、单体和聚合物,如式(I)的 12H,14H-5,7-二氧
并五苯,其 12、14 位上含有
全氟烷基和/或芳基;以及式(II)的 5H,12H-7,14-二氧
并五苯,其 5、12 位上含有
全氟烷基和/或芳基。这些单体可用于制备先进的高性能聚合物,尤其是聚
酰亚胺。刚性的五环核心可降低聚合物的热膨胀系数,而含
氟取代基则可提高介电常数和吸
水性能。每个单体单元的五环核心都含有两个-O 桥和两个-CRRf 桥(其中 R 为芳基、取代芳基或
全氟烷基,Rf 为
全氟烷基)。