Preparation of Anti-layered Polyamide-66/Polyacrylonitrile/Polyethersulfone (PA-66/PAN/PES) Sandwich Structured Membrane for Air Filtration by Electrospinning

doi:10.7503/cjcu20160855

Abstract

Abstract:

A simple and effective composite fiber filter material was prepared which was composed of polyamide-66/polyacrylonitrile/polyethersulfone(PA-66/PAN/PES) fibers with layer by layer on treated stainless steal mesh(SSM). The intermediate layer of the material was dissolved in an N,N-dimethylformaide(DMF) solvent by PAN/PES. With the increase of the amount of PES under the same spinning condition, it is advantageous for the fiber dia-meter to become small and to increase the porosity of the film by the SEM and BET test. Synchronously, the mechanical properties of the films without SSM were measured(5.857 MPa) by tensile test. The surface of the filter membrane has a relatively good hydrophobic effect with contact angle(CA) of 130.58° by making use of the hydrophobicity of PES. In the case of the thickness of the sample as equal as possible, the filtration efficiency of PAN/PES-3 for the particles sized of 0.3—5 μm reached more than 99% by measuring in the actual air environment. The filtered regenerated film was observed by mechanical vibration and air backflush. In addition, we also have explored a substrate for filtered medium by using SSM which was sprayed with water spray to anti-layered.

Key words: Electrospinning, Anti-layered, Composite membrane, Air filtration

CLC Number:

TrendMD:

ZHANG Yingying, KANG Lijuan, HAN Zhaolian, ZHAO Shengzhe, ZHAO Xiaodong, CAO Jinshan, CHENG Zhiqiang. Preparation of Anti-layered Polyamide-66/Polyacrylonitrile/Polyethersulfone (PA-66/PAN/PES) Sandwich Structured Membrane for Air Filtration by Electrospinning[J]. Chem. J. Chinese Universities, 2017, 38(6): 1025.

Figures/Tables 11

Fig.1 Schematic diagram of PA-66/PAN/PES structure of layer by layer composite fiber filter membrane

Fig.2 Schematic diagram of detection device for airborne particulate matter

Fig.3 SEM images of fibrous membranesMass ratio of PAN/PES: (A) 9∶3; (B) 10∶2; (C) 11∶1; (D) 12∶0; (E) the outermost PES fibrous membrane and contact angle with water drops on the part of flat films; (F) the innermost PA-66 tree-like nanofiber.

Fig.4 Fiber diameter distribution of PAN/PES composite ﬁbrous membranes(A), PES fibrous membrane(B) and PA-66 tree-like nanofiber(C)

Fig.5 N2 adsorption-desorption isotherms of PAN/PES-3(with PA-66) nanofilms, PAN/PES-0(with PA-66) nanofilms and PAN/PES-3(without PA-66) nanofilms

Fig.6 TG curves of membranes a. PES; b. PAN/PES-3; c. PAN.

Fig.7 Curves of tensile tests for films with different PAN/PES mass ratiosa. 9∶3; b. 10∶2; c. 11∶1; d. 12∶0.

Table 1 Tensile testing of electrospinning membranes

Sample	Thickness/mm	Density/(g·cm^-3)	Stress/MPa	Strain break(%)
PAN/PES-3	0.038±0.008	0.437±0.002	5.857±0.12	54.62±4.3
PAN/PES-2	0.045±0.003	0.337±0.001	5.906±0.23	52.18±5.6
PAN/PES-1	0.043±0.004	0.353±0.004	5.953±0.19	51.73±9.1
PAN/PES-0	0.042±0.010	0.353±0.007	5.882±0.16	30.94±6.3

Fig.8 SEM images of PAN/PES-3 with the natural environment(PM≥120) for 24 h and comparison of filtration efficiency of samples with different mass ratios of PAN/PES(A) Inset was the corresponding pictures for the regenerated fibers; (B) inset was the quality factor values of relevant membranes. Mass ratio of PAN/PES: a. 9∶3; b. 10∶2; c. 11∶1; d. 12∶0.

Table 2 Detailed plots of membrane for filtration of airborne particles

Sample	Filtration efficiency(%)						Thickness/mm	Δp/Pa	QF
Sample	0.3 μm				0.5 μm	0.7 μm	1 μm	2 μm	5 μm
PAN/PES-3	99.978	99.990	99.992	99.996	99.9994	100	0.038±0.008	522±7	0.016
PAN/PES-2	99.852	99.888	99.936	99.968	99.9982	100	0.045±0.003	498±3	0.013
PAN/PES-1	99.673	99.722	99.905	99.958	99.9976	100	0.043±0.004	518±6	0.011
PAN/PES-0	99.543	99.703	99.872	99.953	99.9968	100	0.042±0.010	481±3	0.011

Fig.9 Contrast of avulsion interfaces for membranes and SSM(A) and (B) are un-sprayed membrane and sprayed membrane based on the SSM by water spray treatment, respectively.

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