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Chinese Journal of Materials Research  2023, Vol. 37 Issue (4): 248-256    DOI: 10.11901/1005.3093.2021.637
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Preparation and Properties of Temperature-Responsive Janus Nanofibers
ZHANG Jinzhong1, LIU Xiaoyun2(), YANG Jianmao2, ZHOU Jianfeng2, ZHA Liusheng1()
1.State Key Laboratory of Fiber Material Modification, School of Materials Science and Engineering, Donghua University, Shanghai 201620, China
2.Analysis and Testing Center, Donghua University, Shanghai 201620, China
Cite this article: 

ZHANG Jinzhong, LIU Xiaoyun, YANG Jianmao, ZHOU Jianfeng, ZHA Liusheng. Preparation and Properties of Temperature-Responsive Janus Nanofibers. Chinese Journal of Materials Research, 2023, 37(4): 248-256.

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Abstract  

A temperature-responsive polymer was synthesized by co-polymerization of N-isopropylacrylamide and acryloyloxybenzophenone. Meanwhile, poly(vinyl alcohol) (PVA) was modified by glycidyl methacrylate. Taking the synthesized polymer and the modified PVA as fiber-forming precursor reagents, of which spinning solutions were then prepared, respectively as the raw materials for producing fiber. Finally, the temperature-responsive Janus nanofibers were fabricated by side-by-side electrospinning under UV irradiation. Scanning electron microscope and transmission electron microscope observation results show that the prepared nanofibers have double-faced structure. The results of nuclear magnetic resonance spectroscopy reveal that the applied ultraviolet irradiation facilitates the formation of crosslinking structure for the double-faced nanofibers. The effect of side-by-side electrospinning process conditions on the yield and average diameter of the Janus nanofibers was investigated, it was found that the yield of the Janus nanofibers can exceed 90% when the flow rates of the two spinning solutions are less than 0.3 mL/h and the spinning voltage is lower than 22 kV. In addition, the average diameter of the Janus nanofibers can be adjusted by changing the receiving distance within a certain range. The prepared Janus nanofibers with a water-soluble polymer content (mass fraction) of less than 2% have good stability in water. When the temperature of the aqueous medium increased from 25℃ to 35℃, the prepared Janus nanofibers can transform from a stretching configuration to a curling one, and this temperature-responsiveness is reversible.

Key words:  composite      Janus nanofibers      side-by-side electrospinning process      temperature-responsiveness      curling upon temperature rising      ultraviolet light radiation     
Received:  15 November 2021     
ZTFLH:  TQ430.50  
Fund: National Natural Science Foundation of China(51373030);National Natural Science Foundation of China(51503033)

URL: 

https://www.cjmr.org/EN/10.11901/1005.3093.2021.637     OR     https://www.cjmr.org/EN/Y2023/V37/I4/248

Fig.1  Schematic diagram of the apparatus for preparing MPVA/PNA Janus nanofibers
Fig.2  1H NMR spectrum of MPVA (a) and 13C NMR spectrum of MPVA (b)
Fig.3  1H NMR spectra of PNA-2 and PNIPAM (a); the relationship curves of the absorbance of the aqueous solutions of three batches of PNA at 500 nm vs. temperature (A-T) and their differential curves (dA/dT-T) (b)
PNA SampleFeeding percentage of ABP/NIPAM / %, mole fractionTested percentage of ABP/NIPAM / %, mole fractionLCST / ℃
PNA-11.00.830.9
PNA-21.51.129.2
PNA-32.01.722.7
Table 1  Obtained molar percentages of ABP/NIPAM within the molecular chains of three batches of PNA and the results of their LCSTs
Fig.4  Appearance images of preparing MPVA/PNA Janus nanofibers by side-by-side electrospinning (a); SEM image of the prepared MPVA/PNA Janus nanofibers (b); TEM image of the prepared MPVA/PNA Janus nanofiber (c) and 1H NMR spectrum of MPVA/PNA Janus nanofibers (d)
SampleFlow rate /mL·h-1Spinning voltage/kVCollection distance/cmAverage width of JNF/nmProductivity of JNF/%
JNF-10.22215588±8392
JNF-20.32215759±5396
JNF-30.42215//
JNF-40.32015842±6990
JNF-50.32215759±5396
JNF-60.32415424±34654
JNF-70.32210227±6294
JNF-80.32215759±5396
JNF-90.32220947±7292
Table 2  Statistical results of the yields and average diameters of MPVA/PNA Janus nanofibers prepared by side-by-side electrospinning process conditions
Fig.5  SEM images of MPVA/PNA Janus nanofibers prepared by different side-by-side electrospinning process
Fig. 6  SEM image of the sample JNF-8 after soaking it in water for 6 h and then drying it (a); SEM image of the sample JNF-8 after oscillating in water at 300 r/min for 2 h and then drying it (b)
Fig.7  Micrographs of MPVA/PNA Janus nanofiber (JNF-8) in aqueous medium at different temperatures (magnification ratio:1000)
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