Color Change of Electrospun Polystyrene/MEH-PPV Fibers from Orange to Yellow through Partial Decomposition of MEH Side Groups

Authors

  • Surawut Chuangchote,

    1. Technological Center for Electrospun Fibers and The Petroleum and Petrochemical College, Chulalongkorn University, Soi Chula 12, Phyathai Road, Pathumwan, Bangkok 10330, Thailand
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  • Toemsak Srikhirin,

    1. Department of Physics, Faculty of Science, Mahidol University, Rama 6 Road, Ratchathewee, Bangkok 10400, Thailand
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  • Pitt Supaphol

    Corresponding author
    1. Technological Center for Electrospun Fibers and The Petroleum and Petrochemical College, Chulalongkorn University, Soi Chula 12, Phyathai Road, Pathumwan, Bangkok 10330, Thailand
    • Technological Center for Electrospun Fibers and The Petroleum and Petrochemical College, Chulalongkorn University, Soi Chula 12, Phyathai Road, Pathumwan, Bangkok 10330, Thailand
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Abstract

The present contribution reports the electrospinning of PS/MEH-PPV fibers with average diameters ranging from 0.165 to 1.190 µm from solutions of PS/MEH-PPV (PS/MEH-PPV = 7.5:1, w/w) in 1,2-dichloroethane. With the addition of pyridinium formate (PF), a volatile organic salt, to the PS/MEH-PPV solution, the electrospinnability of the resulting solution is enhanced significantly. Both the fiber diameters and the number of fibers are found to increase, while the number of beads is found to decrease with increasing applied electrical potential, the addition of PF, and increasing aging period of the spinning solution after PF addition. FT-IR analysis shows that ≈15% of the MEH side groups are removed from the MEH-PPV component in the fibers obtained from the solution that is left to age for 1 month after PF addition, which corresponds well to the loss of mass of ≈7% as observed by thermogravimetric analysis. As a result, partial decomposition of the MEH side groups should be responsible for the observed yellow emission color of the PS/MEH-PPV fibers obtained from the same solution.

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