Effects of Poly(3-hexylthiophene) Molecular Weight and the Aging of Spinning Solution on the Electrospun Fiber Properties

静电纺丝 材料科学 纺纱 纤维 聚合物 环氧乙烷 电导率 化学工程 高分子化学 纳米纤维 电阻率和电导率 复合材料 化学 共聚物 物理化学 工程类 电气工程
作者
Humayun Ahmad,Song Zhang,Chih‐Ting Liu,Guorong Ma,Jason D. Azoulay,Xiaodan Gu,Mahesh K. Gangishetty,Santanu Kundu
出处
期刊:ACS applied polymer materials [American Chemical Society]
卷期号:4 (12): 8812-8824 被引量:9
标识
DOI:10.1021/acsapm.2c01229
摘要

The electrospinning technique is an attractive route for processing conjugated polymers in a significant quantity for large-scale applications. However, the processing–structure–property relationship of the electrospinning process for conjugated polymers is not well understood. Here, we report the electrospinning of poly(3-hexylthiophene) (P3HT) for three different molecular weights of P3HT: 31, 58, and 83 kDa. Chloroform was used as a solvent, and a high molecular weight poly(ethylene oxide) (PEO) was utilized to facilitate the processing of P3HT. Electrospinning was performed on the freshly prepared and 24 h aged spinning solutions. The aging of the spinning solution led to the self-assembly of P3HT chains, particularly with dominant H-aggregation for 83 kDa P3HT. The structure development and properties of the fibers were investigated, including the single-fiber electrical conductivity measured using a custom-built setup. Electrical conductivity has been found to increase with increasing molecular weight, and as high as a fivefold enhancement in single-fiber electrical conductivity was obtained for the fibers from the aged solution compared to the fiber from the freshly prepared solution. Despite a 25% PEO concentration in the fibers, the maximum electrical conductivity of a single fiber was found to be ≈2.7 × 10–5 S/cm, similar to the pristine P3HT thin films. Our study provides an additional understanding of P3HT structure development in electrospun fibers as a function of polymer molecular weight and processing steps and relates that to fiber properties.
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