Electrospinning Fabrication of PAN/Eu-fatty Acid Phase Change and Luminescence Bifunctional Composite Nanofibers†

doi:10.7503/cjcu20150414

Abstract

Abstract:

Complexes of Eu-fatty acid were synthesized with fatty acid and 1,10-phenanthroline as ligand linked up to rare-earth ion(Eu³⁺) as functional light-emitting group. Then, ultrafine fibers of polyacrylonitrile(PAN)/ Eu-fatty acid composite in which Eu-fatty acid acts as a model phase change luminescence material and PAN acts as a supporting material, were prepared via electro-spinning as phase change and luminescence materials. The properties of the novel phase change and luminescence fiber were characterized by scanning electron microscope(SEM), energy dispersive spectrometer(EDS), fluorospectrophotometer(FL), the differential scanning calorimetry(DSC). FL results suggested that under the excitation of 280 nm ultraviolet, PAN/Eu-MA composite nanofiber emitted the predominant emission peaks at 580, 593 and 614 nm, corresponding to ⁵D₀-⁷F₀, ⁵D₀-⁷F₁, ⁵D₀-⁷F₂ transitions of Eu³⁺, respectively. The composite nanofibers have good phase change properties and excellent luminescent property. With the increasing of Eu³⁺ content and carbon numbers of fatty acid, the average diameters of PAN/Eu-fatty acid composite fibers increases from 285 nm to 600 nm. This technique can be used to prepare other similar phase change and luminescence bifunctional composite nanofibers.

Key words: Eu-Fatty acid composite, Polyacrylonitrile, Phase change, Luminescence, Electro-spinning, Nanofiber

CLC Number:

O631
O614

TrendMD:

SHI Qisong, ZHAO Yining, ZHANG Mingchun, JIN Xinyi, LIU Yanchi, YANG Mingshan. Electrospinning Fabrication of PAN/Eu-fatty Acid Phase Change and Luminescence Bifunctional Composite Nanofibers^†[J]. Chem. J. Chinese Universities, 2015, 36(9): 1807.

Figures/Tables 8

Table 1 Material ratios of precursors solution for prepa-ring PAN/Eu-fatty acid composite nanofibers*

Sample	m(Eu-fatty acid)/g
S1(PAN/Eu-SA)	0.34
S2(PAN/Eu-SA)	0.51
S3(PAN/Eu-SA)	0.85
S4 (PAN/Eu-SA)	1.19
S5(PAN/Eu-LA)	0.85
S6(PAN/Eu-MA)	0.85
S7(PAN/Eu-PA)	0.85

Fig.1 SEM images of electrospun PAN/Eu-SA fibers different Eu3+ mass ratios(A) PAN(260 nm); (B) S1(440 nm); (C) S2(453 nm); (D) S3(480 nm); (E) S4(600 nm).

Fig.2 SEM images of electrospun PAN/Eu-fatty acid fibers at different fattyacid(A)PAN/Eu-LA(S5)(285 nm); (B) PAN/Eu-MA(S6)(384 nm); (C) PAN/Eu-PA(S7)(396 nm); (D) PAN/Eu-SA(S3)(480 nm).

Fig.3 EDS spectrum of PAN/Eu-SA(S3) composite nanofibers

Fig.4 Excitation(A) and emission(B) spectra of PAN/Eu-MA composite nanofibers(λem=614 nm, λex=280 nm)

Fig.5 Emission spectra(A) of PAN/Eu-SA composite nanofibers(S1, S2, S3 and S4) with different mass fractions of Eu-SA to PAN(λex=280 nm) and relationship between Eu-SA content and luminescence intensities of peak at 614 nm for PAN/Eu-SA composite nanofibers(B)

Fig.6 DSC curves of PAN/Eu-fatty acid composite fibers a. S3; b. S5; c. S6; d. S7.

Table 2 Melting temperatures(Tm) and melting enthalpies(ΔHm) of electrospun fine composite fibers

Sample	T_m/℃	ΔH_m/(kJ·kg^-1)	Sample	T_m/℃	ΔH_m/(kJ·kg^-1)
S3	64.54	65.91	SA	67.99	192.02
S5	46.34	60.32	LA	49.48	166.93
S6	56.57	65.32	MA	59.27	202.02
S7	57.14	67.48	PA	62.31	207.65

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