【摘要】 全氟烃链的憎氟效应(fluorophobic effect)可有效地促使棒状分子形成近晶相,并稳定液晶相.为进一步探讨氟效应对盘状分子介晶性的影响,合成了一系列全氟酯链的苯并菲化合物C18H6(OCnH2n+1)5(OCOC2H4C6F13)(a),以及另一系列相对应的不含氟化合物C18H6(OCnH2n+1)5(OCOC8H17)(b),n=4～9.DSC检测和偏光显微镜观察显示两类化合物都为柱状相热致型液晶.化合物a与相对应的化合物b比较,其熔点和清亮点上升,柱状相的热稳定性增强.更多还原

【Abstract】 The fluorophobic effect of highly fluorinated alkyl terminal chain of rod-like molecule can effi- ciently promote the formation of semctic phase and improve the stability of mesophase. In order to investi- gate the influence of semi-fluorinated chain on mesomorphism of disctoic molecules, a series of new triphenylene derivatives C18H6(OCnH2n+1)5(OCOC2H4C6F13) with a semi-fluorinated chain, and their hydro- carbon analogues, C18H6(OCnH2n+1)5(OCOC8H17), n=4～9, were synthesized. Studies of DSC and POM texture observations revealed that these triphenylene derivatives showed enantiotropic hexagonal columnar mesophases. Compared with the hydrocarbon ester chain, the semi-fluorinated ester chain increased the melting points and clearing points, and stabilized the columnar mesophase of triphenylene discogens.更多还原