Preparation and Performance of Novel Tb-PEG+Eu-PEG/PANI/PAN Luminescent-electrical-phase Change Composite Fibers by Electrospinning†

doi:10.7503/cjcu20180695

Abstract

Abstract:

Luminescent-electrical-phase change trifunctionalcomposite fibers based on Tb-polyethylene glycol(PEG)+Eu-PEG/polyaniline(PANI)/polyacrylonitrile(PAN) blends in which Tb-PEG and Eu-PEG act as model luminescence-phase change material, PANI acts as electrical material and PAN acts as a supporting material, were fabricated by electrospinning. Scanning electron microscopy, IR spectrum, differential scanning calorimetry, fluorescence spectroscopy and broadband dielectric spectroscopy were used to characterize the morphology structure and properties of the composite fibers. The results indicate that the composite fibers possess excellent photoluminescence, thermal energy storage and electrical conduction. The emitting color of the luminescent composite fibers can be tuned by adjusting the mass ratios of Tb-PEG, Eu-PEG under the excitation of 294 nm single-wavelength ultraviolet light. The melting temperatures of the prepared composite fibers were in the range of 54—67 ℃. The electrical conductivity reaches up to the order of 10^-6 S/cm. The dielectric conductivity and constants are slightly increased with increasing of PANI content. The luminescent intensity and electrical conductivity of the composite fibers can be tuned by adjusting the amounts of Tb-PEG, Eu-PEG, PANI and molecular weight of PEG.

Key words: Polyethylene glycol, Polyaniline, Phase change, Luminescence, Electrical, Electrospinning, Composite fiber

CLC Number:

TrendMD:

ZHAO Yuxuan,CHEN Yanjun,PAN Guxin,WANG Chang,PENG Zhenbo,SUN Zongxu,LIANG Yongri,SHI Qisong. Preparation and Performance of Novel Tb-PEG+Eu-PEG/PANI/PAN Luminescent-electrical-phase Change Composite Fibers by Electrospinning^†[J]. Chem. J. Chinese Universities, 2019, 40(4): 824.

Figures/Tables 15

Scheme 1 Synthesis of Tb-PEG with different molecular weights

Table 1 Compositions and contents of spinning solutions

Sample	Component	M_w of PEG	m(Tb-PEG): m(Eu-PEG)	m(Tb-PEG)/g	m(Eu-PEG)/g	m(PANI· DBSA)/g
S1	Tb-PEG6000/PANI/PAN	6000	10:0	0.18	0	0.18
S2	Tb-PEG8000/PANI/PAN	8000	10:0	0.18	0	0.18
S3	Tb-PEG10000/PANI/PAN	10000	10:0	0.18	0	0.18
S4	Tb-PEG+Eu-PEG(7/3)/PANI/PAN	10000	7:3	0.126	0.054	0.18
S5	Tb-PEG+Eu-PEG(6/4)/PANI/PAN	10000	6:4	0.108	0.072	0.18
S6	Tb-PEG+Eu-PEG(5/5)/PANI/PAN	10000	5:5	0.09	0.09	0.18
S7	Tb-PEG+Eu-PEG(4/6)/PANI/PAN	10000	4:6	0.072	0.108	0.18
S8	Eu-PEG10000/PANI/PAN	10000	0:10	0	0.18	0.18
S9	Tb-PEG10000/PANI35/PAN	10000	10:0	0.18	0	0.21
S10	Tb-PEG10000/PANI45/PAN	10000	10:0	0.18	0	0.27
S11	Tb-PEG10000/PANI55/PAN	10000	10:0	0.18	0	0.33

Fig.1 IR spectrum of the PEG6000 functional compound

Fig.2 SEM images of Tb-PEG6000/PANI/PAN(A), Tb-PEG8000/PANI/PAN(B) and Tb-PEG10000/PANI/PAN(C)

Fig.3 Corresponding diameter distributions of Tb-PEG6000/PANI/PAN(A), Tb-PEG8000/PANI/PAN(B) and Tb-PEG10000/PANI/PAN(C)

Fig.4 EDS spectrum of Tb-PEG10000/PANI/PAN

Fig.5 SEM images of Tb-PEG+Eu-PEG/PANI/PAN composite fibers(S4—S7)m(Tb-PEG):m(Eu-PEG): (A) 7:3; (B) 6:4; (C) 5:5; (D) 4:6.

Fig.6 Excitation(A) and emission(B) spectra of Tb-PEG10000/PANI/PAN composite fibers

Fig.7 Emission spectra of Tb-PEG6000/PANI/PAN(a), Tb-PEG8000/PANI/PAN(b) and Tb-PEG10000/PANI/PAN(c) composite fibers

Fig.8 Excitation(A) and emission(B) spectra of Eu-PEG10000/PANI/PAN composite fibers

Fig.9 Emission spectra of Tb-PEG+Eu-PEG10000/PANI/PAN composite fibers m(Tb-PEG):m(Eu-PEG): a. 10:0; b. 7:3; c. 6:4; d. 5:5; e. 4:6; f. 0:10.

Fig.10 DSC curves of Tb-PEG+Eu-PEG/PANI/PAN composite fibers(A) a. S1; b. S2; c. S3. (B) a. S4; b. S5; c. S6; d. S7.

Table 2 Melting temperatures(Tm) of electrospun composite fibers

Sample	Content	T_m/℃	Sample	m(Tb-PEG):m(Eu-PEG)	T_m/℃
PEG6000	PEG6000	48.40	S4	7:3	56.91
PEG8000	PEG8000	61.82	S5	6:45:5	58.49
PEG10000	PEG10000	64.22	S6	5:5	58.80
S1	Tb-PEG6000/PANI/PAN	54.87	S7	4:6	60.38
S2	Tb-PEG8000/PANI/PAN	64.93
S3	Tb-PEG10000/PANI/PAN	66.02

Fig.11 Frequency dependent electric conductivity(A), dielectric constant(B) and dielectric loss(C) of the fibers S9(a), S10(b) and S11(c)

Table 3 Electrical conductivity and dielectric constant of the samples doped with various amount of PANI

Sample	Mass ratio of PANI·DBSA to PAN(%)	10⁶Conductivity/(S·cm^-1)	Dielectric constant at 1 kHz
S9	35	0.98	145
S10	45	1.42	227
S11	55	1.50	263

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