Spinning method of PEDOT:PSS conductive fiber high in elongation

Abstract

The invention relates to a wet spinning method of PEDOT:PSS conductive fiber high in elongation in an organic polymer conductive fiber preparation technology. The method includes the following steps that firstly, PEDOT:PSS spinning fluid is prepared; then, the spinning fluid enters an ethyl alcohol and water mixed coagulating bath through a wet spinning spinneret plate to be subjected to coagulation forming, wherein LiCl is added in the ethyl alcohol and water mixed coagulating bath, and the addition concentration is 0.1-0.5 mol/L; and fiber obtained after coagulation forming is dried and cooled after being subjected to drafting, and the PEDOT:PSS conductive fiber high in conductivity and elongation is prepared. According to the method, one-step method wet spinning is adopted, the water/ ethyl alcohol system coagulating bath is adopted as the main body, lithium ions are added in the coagulating bath to assist in fiber solidification forming, the lithium ions are doped in the fiber, andtherefore the fiber tensile elongation and conductivity are obviously improved, the application range of the fiber in textile materials is widened, and processing adaptability of the fiber is improved.

Description

technical field [0001] The invention relates to the technical field of preparation of organic polymer conductive fibers, in particular to a spinning method of high-elongation PEDOT:PSS conductive fibers. Background technique [0002] Poly-3,4-ethylenedioxythiophene (PEDOT) is a prototype conjugated polymer used in the doped state as a hole-injection / transport layer in organic (opto)electronic devices, which is modified with poly(p-styrenesulfonate) After anion (PSS) doping, a uniformly dispersed and stable PEDOT:PSS aqueous suspension can be obtained, and the PEDOT:PSS material has high electrical conductivity and good optical transparency. Under proper conditions, it can produce continuous fibers by a relatively simple wet-spinning technique, which has broad application prospects in electronic textile products. However, the stretchability of PEDOT:PSS fibers is poor, which cannot meet the processing requirements of some textile materials. Therefore, how to prepare PEDOT:P...

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Problems solved by technology

Moreover, these methods are all based on the organic coagulation bath system of acetone / isopropanol, and this coagulation bath has a strong phase separation effect on the dispersion of PSS, and the diffusion and exchange process between the two components is too fast, making the wet-formed PEDOT:PSS fiber feels brittle and hard (low elongation, about 5 ~ 12%), which cannot fully reflect the flexibility advantage of the fiber

If the fiber post-treatment process uses dimethyl sulfoxide, ethylene glycol, etc. to remove the residual PSS in the obtained fiber to improve the fiber conductivity, the stretchability of the fiber will be further reduced

Moreover, acetone and isopropanol are toxic to the human body. The coagulation bath is expensive and easy to cause environmental pollution, which has become a shortcoming of fiber engineering.

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