Preparation, Characterization and Application of Amine-functionalized Poly(lactic acid) Electrospun Fibers†

doi:10.7503/cjcu20140219

Abstract

Abstract:

Amine-functionalized poly(lactic acid)(PLA) nanofibers were prepared by co-electrospinning of PLA and aminopropyltriethoxysilane(KH550) in 1,1,1,3,3,3-hexafluoroisopropanol. The contents of amine groups on the surfaces of the fibers were measured by chemical titration. The results show 19%—26% of total amine groups appeared on the fiber surfaces when 3%—13% of KH550 to PLA is added. The amine-functionalized PLA nanofibers were also characterized by field emission scanning electron microscopy, differential scanning calorimetry(DSC), contact angle measurements and uniaxial tensile tests. It has been shown that the addition of KH550 can introduce amine groups on PLA fiber surfaces, meantime the fiber diameter decreases, T_g of PLA increases, T_m of PLA decreases, the hydrophilicity of the fiber mat slightly increases and its mechanical properties decreases. Au nanoparticles were adsorbed on the surface of amine-functionalized PLA nanofibers, which showed good catalytic activity and reusability for the reduction of 4-nitrophenol.

Key words: Poly(lactic acid), Electrospinning, Aminopropyltriethoxysilane(KH550), Amine-functionalization, Catalytic activity, Nanofiber

CLC Number:

O631

TrendMD:

XIONG Xi, LI Qiang, ZHANG Xucheng, YU Jian, GUO Zhaoxia. Preparation, Characterization and Application of Amine-functionalized Poly(lactic acid) Electrospun Fibers^†[J]. Chem. J. Chinese Universities, 2014, 35(6): 1323.

Figures/Tables 10

Fig.1 FE-SEM images of electrospun PLA/KH550 fibersMass fraction of KH550(%): (A) 0; (B) 3; (C) 8; (D) 13.

Table 1 Diameters, surface NH2 contents and contact angles of electrospun PLA/KH550 mats

Sample	Fiber diameter/μm	Surface NH₂ content/(mmol·g^-1)	Ratio of NH₂ on surface(%)	Contact angle/(°)
Pure PLA	0.90±0.14	0	0	129.4±1.8
PLA/3%KH550	0.40±0.14	0.025	19.1	115.2±1.6
PLA/8%KH550	0.39±0.07	0.074	22.2	107.3±1.8
PLA/13%KH550	0.28±0.08	0.141	26.1	102.2±0.9

Table 2 Thermal properties and crystallinity of PLA/KH550 electrospun mats

Sample	T_g/℃	T_m/℃	Δ $H m a$ /(J·g^-1)	$X c b$ (%)
Pure PLA	43.26	152.65	11.5	12.4
PLA/3%KH550	50.95	146.62	27.1	29.2
PLA/8%KH550	52.19	143.90	25.1	27.0
PLA/13%KH550	52.83	142.36	23.6	25.4

Table 2 Thermal properties and crystallinity of PLA/KH550 electrospun mats

Sample	T_g/℃	T_m/℃	Δ $H m a$ /(J·g^-1)	$X c b$ (%)
Pure PLA	43.26	152.65	11.5	12.4
PLA/3%KH550	50.95	146.62	27.1	29.2
PLA/8%KH550	52.19	143.90	25.1	27.0
PLA/13%KH550	52.83	142.36	23.6	25.4

Fig.2 DSC curves of PLA/KH550 electrospun matsa. PLA; b. PLA/3%KH550; c. PLA/8%KH550; d. PLA/13%KH550.

Fig.3 Stress-strain curves of PLA/KH550 electrospun matsa. PLA; b. PLA/3%KH550; c. PLA/8%KH550; d. PLA/13%KH550.

Table 3 Mechanical properties of PLA/KH550 electrospun mats

Sample	Thickness/mm	Modulus/MPa	Tensile strength/MPa	Elongation at break(%)
Pure PLA	0.144±0.001	63.6±10.2	3.9±0.1	122.8±6.9
PLA/3%KH550	0.099±0.014	29.4±5.5	2.7±0.1	34.2±0.3
PLA/8%KH550	0.075±0.005	27.6±6.1	1.5±0.1	14.4±0.9
PLA/13%KH550	0.105±0.004	46.6±8.4	2.0±0.1	6.9±1.1

Fig.4 FE-SEM images of Au nanoparticles adsorbed on PLA/KH550 fibersMass fraction of KH550(%): (A) 3; (B) 8; (C) 13.

Fig.5 TGA curves of Au-containing PLA/KH550 fibers

Fig.6 UV-Vis spectra of 4-nitrophenol solution with Au nanoparticles-adsorbed on electrospun PLA/KH550 fibers containing different amounts of KH550 as catalystMass fraction of KH550(%): (A) 3; (B) 8; (C) 13; (D) without catalyst.

Fig.7 Absorbance vs. reaction time curves(A) and catalytic activity of PLA/13%KH550 sample in 3 times(B)

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