An ultraviolet-assisted electrospinning procedure of polyimide ultrafine fibrous membranes fabricated by ester-type nega
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An ultraviolet-assisted electrospinning procedure of polyimide ultrafine fibrous membranes fabricated by ester-type negative photosensitive polyimide Lin Qi1, Chen-yu Guo1, Yan Zhang1, Lu-meng Yin1, Lin Wu1, Jin-gang Liu1,* Xiu-min Zhang2,*
, and
1
Beijing Key Laboratory of Materials Utilization of Nonmetallic Minerals and Solid Wastes, National Laboratory of Mineral Materials, School of Materials Science and Technology, China University of Geosciences, Beijing 100083, China 2 School of Electrical Engineering, Beijing Jiaotong University, Beijing 100044, China
Received: 9 May 2020
ABSTRACT
Accepted: 21 August 2020
An ultraviolet-assisted electrospinning (UVAES) procedure was performed using in situ photopolymerization during the electrospinning process to enhance the solvent resistance of polyimide (PI) ultrafine fibrous membranes (UFMs). The resultant PI UFMs were fabricated via solution electrospinning using photosensitive poly(amic acid ester) (PSPAE) modified with unsaturated double bond side chains as the main fiber-forming agent, diethylene glycol diacrylate as the crosslinker, and titanocene as the photoinitiator. The precursor PSPAE UFMs were prepared via both of normal electrospinning and UVAES procedures and then were converted to PI using thermal imidization at 350 °C in a nitrogen imidization. The physical and chemical properties of the obtained PI UFMs were subsequently studied. The fibers exposed to ultraviolet irradiation possessed a smooth surface morphology and maintained their fibrous structure after thermal imidization at elevated temperature as high as 350 °C in nitrogen, whereas the crosslink-free PSPAE fibers lost their fibrous structure after heating. Furthermore, as well as providing enhanced thermal decomposition stability, the introduction of a crosslinked structure via ultraviolet irradiation also protected the molecular chains from organic solvents, resulting in excellent solvent resistance of the PI UFMs.
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Springer Science+Business
Media, LLC, part of Springer Nature 2020
1 Introduction Over the last decade, functional polymer ultrafine fibrous membranes (UFMs) have been founding various applications in advanced flexible and
wearable electronic fabrications [1, 2]. Flexibility, light-weight, stretchability, and good thermal resistance are usually basic property requirements for the polymer UFMs due to the complicated fabricating procedures in the above applications [3, 4].
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https://doi.org/10.1007/s10854-020-04319-1
J Mater Sci: Mater Electron
Electrospinning using polymer solutions or melts has been described in the literature as an excellent strategy for preparing continuous ultrafine fibers due to the quick, simple, and inexpensive feature [5]. Among the electrospinning methods, solution electrospinning is more commonly employed because sophisticated characterization is possible. This method involves shaping of the fibers via a physical process that is driven by electrostatic repulsion forces [6
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