Influence of molecular weight on performance of polyacrylonitrile ultrafiltration membrane

doi:10.19491/j.issn.1001-9278.2024.10.001

Abstract

Abstract:

This article reported an investigation on the structure and performance of the polyacrylonitrile （PAN） ultrafiltration membranes prepared by a phase⁃transformation method using four types of PAN with different viscosity average⁃molecular weights （M_η≈2.2×10⁵ g/mol， 6×10⁵ g/mol， 7×10⁵ g/mol， 8×10⁵ g/mol）. PEG⁃4000 or SiO₂ as a common additive was added to the solution to adjust the microstructure and performance of the ultrafiltration membranes. The results indicated that the water flux and retention flux of the ultrafiltration membranes decreased with an increase in the molecular weight of PAN. However， there is a reduction in the finger shaped⁃hole and hydrophilicity with an increase in the molecular weight of PAN. In contrast， the finger shaped⁃hole and hydrophilicity were improved with the addition of the additives. Meanwhile， the water flux of the PAN ultrafiltration membrane with a high molecular weight increased from 100 to 3 000 L/（h·bar） after the addition of the additives， and the average concentration of the filtered oil⁃water mixture was 5 mg/L.

Key words: polyacrylonitrile, molecular weight, ultrafiltration membrane, additive, phase transformation

CLC Number:

TQ325.8

WANG Chunqi, ZHANG Lei, HUANG Yanpei, FU Zhongyu. Influence of molecular weight on performance of polyacrylonitrile ultrafiltration membrane[J]. China Plastics, 2024, 38(10): 1-4.

Figures/Tables 7

样品名称	分子量/g·mol^-1	PEG含量/%	SiO₂含量/%
PAN⁃1	2.2×10⁵ （10 %）	-	-
PAN⁃2	6×10⁵ （5 %）	-	-
PAN⁃3	6×10⁵ （5 %）	1	-
PAN⁃4	6×10⁵ （5 %）	1	0.3
PAN⁃5	7×10⁵ （5 %）	-	-
PAN⁃6	7×10⁵ （5 %）	1	-
PAN⁃7	7×10⁵ （5 %）	1	0.3
PAN⁃8	8×10⁵ （5 %）	-	-
PAN⁃9	8×10⁵ （5 %）	1	-
PAN⁃10	8×10⁵ （5 %）	1	0.3

Tab.1. Composition and numbering of membrane samples

Fig.1. Water flux of PAN ultrafiltration membranes with different molecular weight

Fig.2. Average retention flux of PAN ultrafiltration membranes with different molecular weight

Fig.3. Average oil⁃water concentration after filtration

Fig.4. Cross⁃sectional morphology of PAN ultrafiltration membranes without additives

Fig.5. Cross⁃sectional morphology of PAN ultrafiltration membranes with additives

Fig.6. Water contact angles of different membranes

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