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以苯乙烯为单体,S,S’-(a,a’-二甲基-a″-乙酸)三硫代碳酸酯(BDAAT)为链转移剂,偶氮二异丁腈(AIBN)为引发剂,进行苯乙烯(St)的可逆加成——断裂链转移(RAFT)自由基聚合,同时以传统的自由基本体聚合方法制备聚苯乙烯(PS)。然后以两种方法制备的PS和聚乙二醇(PEG)为成膜物质,通过水滴模板法在高湿氮气下制备了微观多孔膜。探讨了聚苯乙烯多孔膜的形成机理,研究了聚合方式、聚合物溶液质量分数及溶剂的挥发性等对微观多孔膜结构的影响。研究结果表明,多孔薄膜的形貌受线性聚合物的末端基团以及亲水性物质等综合因素的影响,膜孔径随聚合物溶液质量分数的增大而减小。
Using styrene as monomer, S, S ’- (a, a’-dimethyl- a "-acetic acid) trithiocarbonate (BDAAT) as chain transfer agent, azobisisobutyronitrile (AIBN) Initiator, styrene (St) reversible addition-fragmentation chain transfer (RAFT) free radical polymerization, while traditional free radical bulk polymerization of polystyrene (PS) prepared by the two methods and then prepared PS And polyethylene glycol (PEG) as film-forming materials, the microsporous films were prepared by droplet template method under high-humidity nitrogen atmosphere.The formation mechanism of polystyrene porous films was discussed.The effects of polymerization mode, polymer solution mass fraction and Solvent volatility on the microstructure of the porous membrane.The results show that the morphology of the porous membrane is affected by the combination of the terminal groups of the linear polymer and hydrophilic substances and other factors, the membrane pore size with the polymer solution mass fraction Increase and decrease.