Isotactics polyfluorene - Monomers, Polymers, Diblockcopolymers

拟议项目的目标是合成、分离和表征全同立构多荧烯。这项研究项目已经运行了两年，还没有得到资助。极性取代基(如I-PF8-2CN中的氰乙基)的引入将导致侧链的偶极相互作用，并应导致固体有序度的增加。此外，我们还将研究全同立构聚荧烯中形成？相的可能性。此外，棒状/棒状全共轭两嵌段共聚物将以单溴封端的聚(3-烷基噻吩基)大分子单体和手性AB型荧烯单体通过“接枝”聚合的方式合成。它们的光学、热学和填充性能将与由相应的外消旋氟单体制成的全共轭嵌段共聚物进行比较。因此，具有极性聚噻吩嵌段(例如，具有膦酸酯侧链)和非极性聚荧烯嵌段的两亲性体系也因其特殊的自组织行为而引起人们的兴趣。我们将详细研究得到的嵌段共聚物的光学和手性性质，特别是对称性降低引起的手性诱导效应。

Targets of the proposed project are the synthesis, isolation and characterization of isotactic polyfluorenes. This research project has been running for two years and is not yet funded. The introduction of polar substituents (e.g. cyanoethyl-group in i-PF8-2CN) will cause the dipolar interaction of the side chains and should lead to an increased solid state order. Furthermore, we will investigate the possibility of ß-phase formation in isotactic polyfluorenes. Further on, rod/rod-type all-conjugated diblock copolymers will be synthesized in a „grafting from“ polymerization using a monobromo-terminated poly(3-alkylthiophene) macromonomer and chiral AB-type-fluorene monomers. Their optical, thermal and packing properties will be compared to all-conjugated block copolymers made from the corresponding racemic fluorine monomers. Hereby, also amphiphilic systems with a polar polythiophene block (e.g. with phosphonic ester side chains) and non-polar polyfluorene block are interesting due to their specific self-organization behavior. The optical and chiroptical properties of the resulting block copolymers will be investigated in detail, especially for chiral induction effects caused by the reduced symmetry.