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A Study On Preparation And Adsorptive Properties Of Sulfonated Superfine Polystyrene Resins

Posted on:2008-05-12Degree:MasterType:Thesis
Country:ChinaCandidate:C W XuFull Text:PDF
GTID:2121360218451299Subject:Materials science
Abstract/Summary:PDF Full Text Request
The stable polystyrene microemulsion was successfully synthesized, and superfine polystyrene particles (SfPS) were made via the cosolvent system developed in our lab. The superfine sulfonated polystyrene particles (SSPS) were obtained by using solid state sulfonation. The adsorption of copper ions (II) and cationic dye (5GN) of SSPS particles and the blend films of SSPS and polyvinyl alcohol were investigated with ultraviolet-visible spectrophotometer. The particle dimensional distributions of SfPS and SSPS were measured with LS-800 Laser Particle Analyser. The particle morphologies of SfPS and SSPS were observed with H-600 Transimission Electron Microscope. The sulfonation and sulfonation degree of SSPS were analysed by NICOLET 5700 Infrared Spectroscopy. The following aspects were carefully studied in this thesis:1. Based on the orthogonal experiment design, the dosages of emulsifier OP-10, auxillary emulsifier DBS, crosslinker DVB were optimized according to the stability of microemulsion and the resulted SfPS particle size.2. The demulsifying methods, filtration via vaccum and drying were investigated to avoid the formation of particle clusters or aggregate.3. The factors which affacted the sulfonation of superfine polystyrene via concentrated sulfuric acid route were considered and discussed.4. The copper ion(II) and cationic dye adsorptions with SSPS particles and the blend film of SSPS and polyvinyl alcohol were studied.The general conclusions were made in the following aspects:1. A very large quantity of monomer styrene and polymer, 44%, was solublized with the emulsifier system. This could be direactly applied on an industiral scale. 2. The optimized formula included emulsifier OP-10 34 parts, auxillary emulsifier DBS 4.85 parts, crosslinker DVB 4.85 parts, initiator K2S2O8 25 parts (3wt% aqueous solution), and monomer 114 parts.3. The remarkable demulsification was achieved by the combination of dilute sulfuric acid and organic solvent.4. The optimized sulfonation conditions for superfine polystyrene were: sulfuric acid 95%, reaction temperature 85℃and reaction time 3h.5. The superfine sulfonated polystyrene particles can be obtained by the following processes: microemulsion polymerization of styrene, demulsification, precipitation and washing, filtration and drying, sulfonation and washing, and filtration and drying.6. Around 83 % benzene ring of polystyrene was sulfonated according to the analysis of infrared spectra.7. Both the diameter distributions of SfPS and SSPS particles were uniform, the maximum particle showed the diameter of 2μm for SSPS.8. SSPS indicated the rapid and strong adsorption for cationic dye.The feature and innovation points of this thesis could include:1. The combination of dilute sulfuric acid and organic solvent has been developed to demulsify the highly stable polystyrene microemulsion.2. The degree of sulfonation was quantified based on the infrared spectra.3. The superfine sulfonated polystyrene particles and the crosslinked polyvinyl alcohol films imbedded SSPS particles were employed to conduct out the adsorption for cationic red dye (5GN), and showed a satisfied results.
Keywords/Search Tags:Polystyrene, sulfonation, microemulsion, demulsification, ion exchange resin, adsorption
PDF Full Text Request
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