Abstract
The effects of thermal treatment on the microstructure and mechanical properties of electrospun polystyrene (PS) fibers were investigated. Two types of thermal treatments were performed: (1) slow cooling from 80 °C to room temperature, (2) constant-temperature annealing at 110 °C for 10–120 min. SEM images showed that the internal porosity of the fibers decreases with a decreasing cooling rate and with an increasing annealing time. The severity of fusion of the fiber mats during cutting decreased with a decreasing cooling rate and was eliminated by constant-temperature annealing at 110 °C for 10 min. N2-physisorption did not show any relationship between the cooling rate and porosity of the fibers, but it was found that the volumes of micro- and mesopores in the fibers decreased with an increasing annealing time. Uniaxial tensile testing showed a degradation in mechanical properties at a cooling rate of 0.1 °C s−1 with a recovery in strength and ductility, but further degradation of stiffness at 0.03 °C s−1. Similar degradation of mechanical properties was found after annealing at 110 °C for 10 min, followed by a recovery of strength, stiffness, and ductility at 60 min. This work demonstrates that annealing PS fibers is a viable method to decrease the porosity and eliminate any potential fusion of electrospun PS fiber mats so they can be used in other manufacturing processes, such as ceramic processing.
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Acknowledgements
The authors acknowledge the Department of Materials Science and Engineering and the Department of Chemistry at Virginia Tech for supporting this work. Juan Diego Shiraishi Lombard acknowledges the financial support from the New Horizon Graduate Scholars program. The authors thank David Cyprian Hicks (Department of Materials Science and Engineering, Virginia Tech) and Zhengping Zhou (Department of Chemistry, Virginia Tech) for synthesizing the fibers used in this work, Eric Gilmer (Department of Chemical Engineering, Virginia Tech) for helping with DMA testing, and Kaitlyn Shirey (Department of Materials Science and Engineering, Virginia Tech) for her assistance in SEM image acquisition.
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Juan Diego Shiraishi Lombard received financial support from the New Horizon Graduate Scholars program at Virginia Tech for his PhD work. The authors declare that they have no conflict of interest. There was no experiment involving any human tissue in this work.
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Lombard, J.D.S., Liu, T., Liu, G. et al. Thermal treatment of electrospun polystyrene fibers: microstructural evolution and mechanical behavior. J Mater Sci 58, 6009–6024 (2023). https://doi.org/10.1007/s10853-023-08339-0
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DOI: https://doi.org/10.1007/s10853-023-08339-0