Stability of a Novel Poly(amide-urea-imide) Composite Reverse Osmosis Membrane†

doi:10.7503/cjcu20141084

Abstract

Abstract:

A novel poly(amide-urea-imide) composite reverse osmosis membrane was fabricated via two-step interfacial polymerization. First, 5-isocyanato-isophthaloyl chloride(ICIC) as a key functional monomer reacted with m-phenylenediamine(MPD) to prepare the initial substrate MPD-ICIC membrane by single interfacial polymerization technology. Then, the other key functional monomer N,N'-dimethyl-m-phenylenediamine(DMMPD) was polymerized with the remaining ICIC and acyl chlorine group(—COCl) or isocyanato group(—N=C=O) of the substrate membrane to obtain the new poly(amide-urea-imide) composite reverse osmosis membrane(MPD-ICIC@ICIC-DMMPD) after heat-curing and water rinse. The surface chemical structure of membrane active layer was analyzed by combination of attenuated total reflectance infrared and X-ray photoelectronic spectroscopy, and the separation performance of membrane was also measured. Then, the stability of the obtained membrane MPD-ICIC@ICIC-DMMPD was further analyzed microscopically by molecular dynamic simulation method.

Key words: Molecular dynamic simulation, Poly(amide-urea-imide), Reverse osmosis membrane, Membrane stability, N,N'-Dimethyl-m-phenylenediamine, Two-step interfacial polymerization

CLC Number:

O631
TQ028.8

TrendMD:

WU Lixiang, CAI Zhibin, CHEN Xiaolin, LIU Lifen, ZHU Lifang, GAO Congjie. Stability of a Novel Poly(amide-urea-imide) Composite Reverse Osmosis Membrane^†[J]. Chem. J. Chinese Universities, 2015, 36(4): 765.

Figures/Tables 7

Fig.1 Structures of used monomers

Fig.2 IR spectra of ICIC(A), MPD(a), DMMPD(b)(B) and ATR-FTIR spectrum of MPD-ICIC-DMMPD membrane(C)

Table 1 Elemental composition of the possible ideal structures of polymer chains of the active layer and the actual data of XPS analysis of the MPD-ICIC@ICIC-DMMPD membranes

Calculated data from ideal atructure		Elemental anal.(%)			C/N	C/O	C/N
Calculated data from ideal atructure		C			C/N	O	N
MPD-ICIC	Totally cross-linked(A)	72.0	12.0	16.0	4.50	6.00	0.75
	Linear with pendant—NH₂(B)	73.7	10.5	15.8	4.66	7.02	0.66
	Linear with pendant—COOH(C)	68.2	18.2	13.6	5.01	3.75	1.34
	Linear with pendant—NH₂ and —COOH(D)	70.7	14.6	14.6	4.84	4.84	1.00
ICI-DMMPD	Totally cross-lined(E)	75.0	10.7	14.3	5.25	7.00	0.75
	Linear with pendant—NH₂(F)	76.2	9.5	14.3	5.33	8.00	0.67
	Linear with pendant—COOH(G)	70.8	16.7	12.5	5.67	4.25	1.33
	Linear with pendant—NH₂ and —COOH(H)	73.3	13.3	13.4	5.50	5.50	1.00
MPD-ICI@ICIC-DMMPD membrane(XPS analysis)		72.9	11.5	15.6	4.67	6.34	0.73

Fig.3 Repeating structure cell of MPD-ICIC and ICIC-DMMPD macromolecule chains of the MPD-ICIC@ICIC-DMMPD membrane(X: —NHCONH; Y: —NH2; Z: —COOH)

Fig.4 Separation performance of the MPD-ICIC@ICIC-DMMPD membrane

Fig.5 Interactional energy system of MPD-ICIC@ICIC-DMMPD in the equilibrium state

Fig.6 Interactional energy of MPD-ICIC@ICIC-DMMPD system L-J-D denotes the van der Waals force, and Coul-G represents the electrostatic force.

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