Exploring side-chain length effect on β -phase of polyfluorene derivatives in electrospinning and their optical behavior
Exploring side-chain length effect on β -phase of polyfluorene derivatives in electrospinning and their optical behavior
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静电纺丝中侧链长度对聚芴衍生物β相的影响及其光学行为
DOI：
10.1016/j.polymer.2018.05.025
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发表时间：
2018
期刊：
影响因子：
4.6
通讯作者：
Wei Huang
中科院分区：
文献类型：
--
作者：
Wei Xue;Jin-Yi Lin;Bin Liu;Nai-En Shi;Meng-Na Yu;Wan-Dan Wu;Wen-Sai Zhu;Ling-Hai Xie;Lian-Hui Wang;Wei Huang
聚芴独特的共面β-构象，具有较长的有效共轭长度，有望形成有序和定向的结构，从而提高载流子迁移率、极化发射和优异的光谱稳定性。本文采用静电纺丝法制备了不同侧链的聚二芳基芴（PHDPF、PODPF或PNDPF）和聚（9-乙烯基咔唑）复合纳米纤维。结果表明，在PODPF静电纺纳米纤维中可以得到β相，而在PHDPF和PNDPF体系中则不存在β相。结果表明，聚二芳基芴在静电纺丝中形成β-构象的最佳链长是辛基侧链。与电纺丝纳米纤维相比，相应的自旋涂覆膜中没有β相。β相电纺丝纳米纤维对2,4 -二硝基甲苯（DNT）蒸气的荧光猝灭灵敏度明显高于非晶态电纺丝纳米纤维和自旋包覆膜。协同分子设计和静电纺丝工艺可以为控制聚合物构象提供一种迷人的策略，以调整纳米和微光学器件，如有机荧光传感器、激光器和发光二极管。
Unique coplanarβ-conformation of polyfluorene, endowed with long effective conjugated length, is promising to form ordered and oriented structures that can result in improved carrier mobility, polarization emission and excellent spectral stability. Herein, a series of polydiarylfluorenes of different side-chains (PHDPF, PODPF or PNDPF) and poly (9-vinylcarbazole) composite nanofibers were prepared via electrospinning approach. It is observed thatβ-phase can be obtained in PODPF electrospun nanofibers whereas absent in those of PHDPF and PNDPF systems. It can be demonstrated that the optimal chain length for polydiarylfluorenes toβ-conformation is an octyl side chain in electrospinning. In contrast with the electrospun nanofibers, there was noβ-phase in the corresponding spin-coated film. For theβ-phase electrospun nanofibers, the fluorescence quenching sensitivity on 2, 4-dinitrotoluene (DNT) vapor was obviously higher than that of amorphous electrospun nanofibers and spin-coated film, respectively. Synergistic molecular design and electrospun processing may offer a fascinating strategy for the control of polymer conformation to the adjustment of nano and micro optical devices such as organic fluorescence sensors, lasers and light-emitting diodes.