The performance of double layer structure membrane prepared from flowing coagulant

2017 International Conference on Material Engineering and Advanced Manufacturing Technology

Kee, Chan Mieow^1 ; Chan Xeng, Anthony Leong^2 ; Regal, Sasiskala^1 ; Singh, Balvinder^1 ; Raoo, Preeshaath^1 ; Koon Eu, Yap^1 ; Choo, Ng Sok^3

Faculty of Engineering and the Built Environment, SEGi University, 9 Jalan Teknologi, Taman Sains Selangor, PJU 5, Kota Damansara, Selangor Petaling Jaya

47810, Malaysia^1

Taylor's College, 1 Jalan SS15/8 SS15, Selangor Subang Jaya

47500, Malaysia^2

School of Information Technology, SEGi University, Malaysia^3

关键词: Double layer structure;    Double-layer membrane;    Exchange rates;    Free structures;    Laminar condition;    Membrane fabrication;    Membrane properties;    Surface integrity;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/282/1/012003/pdf
DOI  :  10.1088/1757-899X/282/1/012003

来源: IOP

【 摘 要 】

Membrane with double layer structure is favourable as it exhibits smooth surface and macrovoids free structure. However, its' performance in terms of permeability, porosity and strength has not been studied thoroughly. Additionally, the effect of flowing coagulant on the formation of double layer membrane has not been reported. Thus, the objective of this study is to investigate the performance of double layer membranes, which were prepared using flowing coagulant. Results showed that when the coagulant flow changed from laminar to turbulent, the pure water permeation of the membrane increased. It was due to the higher porosity in the membrane, which prepared by turbulent flow (CA-Turbulent) compared to the membrane which fabricated under laminar condition (CA-Laminar). This can be explained by the rapid solvent-coagulant exchange rate between the polymer solution and the turbulent coagulant. In term of strength, the tensile strength of the CA-Turbulent was ∼32 MPa, which was 100% higher compared to CA-Laminar. This may due to the presence of large amount of nodules on its surface, which reduced the surface integrity. In conclusion, flowing coagulant altered the membrane properties and adopting turbulent coagulant flow in membrane fabrication would improve the porosity, surface roughness and the strength of the membrane.