Research On Modification Of PEG Block PSF

Polysulfone is a transparent, heat-resistant, ultra-stable, high-performance engineering thermoplastics. Has a low degree of flammability and smoke as well as good electrical properties. PSF material hydrolysis, and its Tg up to 185?, long-term using temperature up to 200?. Currently PSF materials have been widely used in various fields of electronic, automotive, aerospace, medical equipment.PSF has excellent performance especially in the field of hemodialysis.It is the main material of hemodialysis membranes prepared. But now PSF dialysis membrane mainly using the technique of sulfonated after polymerization, the effect of this PSF dialysis membrane there is still much room for improvement, and now for the other to improve PSF research material modification methods developing slowly. Expanding research in this area should be further strengthened.In this paper, bisphenol A and 4,4-dichloro-diphenyl sulfone monomer as a raw material, sodium hydroxide as a catalyst, using the mechanism of anionic polymerization prepared PSF, and explore the optimal reaction conditions for the synthesis of polysulfone:two kinds of monomer feed strictly equivalent,1% sodium hydroxide excess, the reaction temperature is controlled at 165?170?, the reaction time was 6 hours.After that use NaH as another catalyst, respectively, using the PEG200. PEG1000. PEG2000 as the starting material for preparing a series of different PEG chain length copolymer and different levels of PEG in copolymer PEG block the PSF. And tested the effect of different series of PEG-modified block copolymer PSF. The results show that the heat resistance of modified PSF has a corresponding decline with PEG chain segment content increases, However, long-chain segments of PEG modified final product obtained relatively better heat resistance at the same content of PEG. As well long-chain segments of PEG modified final product obtained relatively higher heat Tg at the same content of PEG.Modified PSF with increasing PEG chain segment content, which will significantly improve the hydrophilicity. To improve the hydrophilicity of the product need to enhance the content of PEG.To improve the hydrophilicity of the product can not rely on changing the length of PEG segments.This paper innovative used NaH as catalyst providing the conditions for the next coupling reaction. Even using the coupling of dichloromethane succeeded increasing the average molecular weight of the product from 16000 to 27000, to achieve the idea of increasing the molecular weight by a chain reaction. Through a series of parallel experiments to finalize the coupling reaction at 165? and the optimum reaction time is three hours. Coupling product proved that the Tg is indeed significantly improved than the product before coupling, indicating that the coupling chain can effectively improve the long-term use temperature of the product.