Interplay between solid state microstructure and photophysics for poly(9,9-dioctylfluorene) within oriented polyethylene hosts
Interplay between solid state microstructure and photophysics for poly(9,9-dioctylfluorene) within oriented polyethylene hosts
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DOI：
10.1002/polb.23601
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发表时间：
2015
期刊：
影响因子：
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通讯作者：
A. Perevedentsev;S. Aksel;K. Feldman;Paul S. Smith;P. Stavrinou;D. Bradley
中科院分区：
文献类型：
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作者：
A. Perevedentsev;S. Aksel;K. Feldman;Paul S. Smith;P. Stavrinou;D. Bradley
我们提出了各向同性和单轴取向的二元共混物膜的研究，所述二元共混物膜包括分散在超高分子量（UHMW）和线性低密度（LLD）聚乙烯（PE）两者中的1wt%的共轭聚合物聚（9，9-二辛基芴）（PFO）。利用偏振吸收光谱、荧光光谱、拉曼光谱、扫描电子显微镜和X射线衍射对拉伸变形前后的样品进行了表征。结果表明，共混物膜可以与PFO链采用几种不同的分子构象的组合，即玻璃态，结晶，和所谓的b-相，这直接影响所得的光学性能制备。PFO浓度和拉伸温度都强烈影响共混物薄膜拉伸过程中PFO链的排列。在这两种PE主体中，PFO的结晶化发生在拉伸过程中;所得的有序链显示出最佳的光学各向异性。我们的研究结果澄清了PFO的微观结构在定向共混物与PE和实现最大的光学各向异性所需的加工条件。2014年，作者。高分子科学杂志B部分：高分子物理，Wiley Periodi- cals，Inc.出版. J.波利姆科学，部分B：聚合物物理学2014，00，000-000
We present a study of isotropic and uniaxially ori- ented binary blend films comprising 1 wt % of the conjugated polymer poly(9,9-dioctylfluorene) (PFO) dispersed in both ultra- high molecular weight (UHMW) and linear-low-density (LLD) polyethylene (PE). Polarized absorption, fluorescence and Raman spectroscopy, scanning electron microscopy, and X-ray diffraction are used to characterize the samples before and after tensile deformation. Results show that blend films can be prepared with PFO chains adopting a combination of several distinct molecular conformations, namely glassy, crystalline, and the so-called b-phase, which directly influences the result- ing optical properties. Both PFO concentration and drawing temperature strongly affect the alignment of PFO chains during the tensile drawing of the blend films. In both PE hosts, crystal- lization of PFO takes place during drawing; the resulting ordered chains show optimal optical anisotropy. Our results clarify the PFO microstructure in oriented blends with PE and the processing conditions required for achieving the maximal optical anisotropy. V C 2014 The Authors. Journal of Polymer Science Part B: Polymer Physics Published by Wiley Periodi- cals, Inc. J. Polym. Sci., Part B: Polym. Phys. 2014, 00, 000-000