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Preparation of PDMS/PES Composite Membranes with High Performance in Pervaporative Desulfurization

Author: ZhangXiongFei
Tutor: WuHong
School: Tianjin University
Course: Chemical processes
Keywords: Interface stability Low swelling Pervaporation desulfurization Polydimethylsiloxane Hybrid Functional coupling agent
CLC: TQ320.721
Type: Master's thesis
Year: 2009
Downloads: 45
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Abstract


In order to prepare high performance polydimethylsiloxane / polyether sulfone (PDMS / PES) permeation evaporation desulfurization film as research objective, functional coupling agent (γ-aminopropyl trimethoxysilane, APTMS and N- β (aminoethyl)-γ-aminopropyl trimethoxysilane, TSD) for PDMS permeation evaporation desulfurization Membranes, prepared by the high interface stability and low swelling PDMS / PES desulfurization film. The study found that the silane coupling agent of APTMS and a TSD not only play the role of the crosslinked PDMS polymer, and at the same time play a role in strengthening interfacial adhesion and improve the stability of PDMS / PES composite membrane interface. PDMS separation layer is studied by SEM-EDS chemical composition analysis and molecular dynamics simulations PDMS / PES composite membrane interfacial interactions at the interface of the PDMS polymer chain movement, try to put the PDMS / PES composite membrane interfacial adhesion mechanism. Annihilation lifetime spectroscopy (PALS) analysis PDMS positron lifetime of the separation layer, the free volume of the film characteristics and the relationship of the separation performance of the preferred association, and pervaporation performance of the PDMS film and inhibiting the swelling properties of the system research. In order to improve the performance of the PDMS membrane separation, preparation of a new type of structured Ag of / SiO 2 desulfurization sorbent and organic - inorganic hybrid method to prepare Ag / SiO 2 -PDMS hybrid membranes. Particle size analysis and transmission electron microscopy (TEM) observed Ag / SiO structured 2 particle morphology, particle size uniform, uniform the Ag distribution of surface doping; through inductively coupled plasma the donor emission spectrometry (ICP) and X-ray photoelectron spectroscopy (XPS) Ag / SiO 2 desulfurization sorbent chemical composed of quantitative analysis. The the Ag / SiO 2 -PDMS hybrid membranes were characterized by field emission scanning electron microscopy (FESEM) observed Ag / SiO 2 -PDMS the hybrid membranes sectional morphology and to determine the thickness of the separation layer. Inorganic particles dispersed in PDMS membrane film hybrid FT-IR analysis showed that the organic - inorganic phase between physical blending. PALS pairs of holes and the volume fraction of the free volume of the membrane was analyzed and found that, with increasing filling amount, PDMS hybrid membrane increased fractional free volume. Visits the the Ag / SiO 2 -the PDMS hybrid membrane pervaporation desulfurization performance When Ag / SiO 2 The filling is 5%, the separation performance of the membrane hybrid the optimal (permeate flux 7.76kg/m2h, the enrichment factor of 4.28).

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