Soluble, processable sulfinyl-based poly(p-phenylene vinylene) (PPV) precursors were synthesized, and the first sulfinyl-based PPV fibers were subsequently spun on a dry-spinning apparatus. 1-(Chloromethyl)-4-[(n-octylsulfinyl)methyl]benzene was synthesized in a 94% yield and polymerized via an analogous approach to the Gilch reaction. Post-polymerization, the sulfinyl group may be thermally eliminated from the backbone of the polymer to obtain conjugated PPV. 1H NMR, 13C NMR, and FTIR confirmed that the polymer structure contained both sulfinyl- and pure PPV-based units. Thermogravimetric analysis indicated that up to 60% elimination of sulfinyl groups occurred during the polymerization reactions and before additional thermal treatment. Spinning dopes were prepared with 45 wt% polymer from 45.0 to 50.0 g of polymer in chloroform and had zero shear viscosities around 60 Pa s at 20 °C. Fibers were dry-spun with and without tension and various jet draw ratios from 0 to 151% to investigate changes in crystallinity, and X-ray diffraction patterns indicated enhanced orientation in the fibers compared to the unprocessed polymers. The fluorescent, conjugated polymer fibers possessed diameters less than 60 μm by SEM and remained soluble until thermal treatment at 150 °C.
合溶解性、可加工的基于亚磺酰的聚对
苯乙烯(PPV)前体被合成,并随后在干纺装置上纺制出首批基于亚磺酰的PPV纤维。1-(
氯甲基)-4-[(n-辛基亚磺酰)甲基]苯的合成产率为94%,通过类似于Gilch反应的方法进行聚合。聚合后,亚磺酰基团可以从聚合物主链中热分离,以获得共轭PPV。1H NMR、13C NMR和FTIR证实了聚合物结构中包含亚磺酰和纯PPV基单元。热重分析表明,在聚合反应以及后续的热处理之前,亚磺酰基团的消失率高达60%。纺丝料以45 wt%的聚合物浓度在
氯仿中从45.0到50.0克的范围制备,且在20 °C时具有约60 Pa s的零剪切粘度。纤维在张力有无的情况下及不同的喷射拉伸比(从0%到151%)进行干纺,以研究晶体结构的变化,X射线衍射图谱表明,与未加工聚合物相比,纤维中的取向得到增强。荧光共轭聚合物纤维的直径小于60微米,
SEM观察显示其在150 °C的热处理前仍保持溶解性。