

FOLLOWUS
a.State Key Laboratory of Polymer Physics and Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, China
b.University of Science and Technology of China, Hefei 230026, China
c.Alan G. MacDiarmid Institute, Jilin University, Changchun 130012, China
zhsu@ciac.ac.cn
Received:13 May 2020,
Revised:2020-6-15,
Accepted:01 July 2020,
Online First:27 August 2020,
Published:02 January 2021
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Wang, Z. Q.; Zhong, Z. X.; Ma, Y. Y.; Lu, X. F.; Wang, C.; Su, Z. H. Melting temperature of individual electrospun poly(vinylidene fluoride) fibers studied by AFM-based local thermal analysis. Chinese J. Polym. Sci. 2021, 39, 219–227
Ze-Qian Wang, Zhen-Xing Zhong, Yu-Ying Ma, et al. Melting Temperature of Individual Electrospun Poly(vinylidene fluoride) Fibers Studied by AFM-based Local Thermal Analysis[J]. Chinese Journal of Polymer Science, 2021, 39(2): 219-227.
Wang, Z. Q.; Zhong, Z. X.; Ma, Y. Y.; Lu, X. F.; Wang, C.; Su, Z. H. Melting temperature of individual electrospun poly(vinylidene fluoride) fibers studied by AFM-based local thermal analysis. Chinese J. Polym. Sci. 2021, 39, 219–227 DOI: 10.1007/s10118-020-2476-9.
Ze-Qian Wang, Zhen-Xing Zhong, Yu-Ying Ma, et al. Melting Temperature of Individual Electrospun Poly(vinylidene fluoride) Fibers Studied by AFM-based Local Thermal Analysis[J]. Chinese Journal of Polymer Science, 2021, 39(2): 219-227. DOI: 10.1007/s10118-020-2476-9.
Thermal properties such as melting temperature can well reflect the microstructure of the polymer material
and have practical implications in the application of nanofibers. In this work
we investigated the melting temperature of individual electrospun poly(vinylidene fluoride) (PVDF) nanofibers with diameters ranging from smaller than 200 nm to greater than 2 μm by the local thermal analysis technique. The PVDF fibers obtained under four different conditions were found to crystallize into
α
and
β
phases
and the fiber mats showed typical values in the crystallinity and
T
m
with no significant difference among the four. However
analyses at single fiber level revealed broad distribution in diameter and
T
m
for the fibers produced under identical electrospinning condition. The
T
m
of individual nanofibers was found to remain constant at large diameters and increase quickly when reducing the fiber diameter toward the nanoscale
and
T
m
values of 220−230 °C were observed for the thinnest nanofibers
much higher than the typical values reported for bulk PVDF. The
T
m
and molecular orientation at different positions along a beaded fiber were analyzed
showing a similar distribution pattern with a minimum at the bead center and higher values when moving toward both directions. The results indicate that molecular orientation is the driving mechanism for the observed correlation between the
T
m
and the diameter of the nanofibers.
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