Abstract: Polystyrene composite membranes were prepared by using wood powder of 48µm or 150µm as filler. The effects of wood powder content, thickness of composite membrane and particle size of wood powder on the urea permeation capability of composite membranes were discussed. The result showed that the addition of wood powder could effectively adjust the urea permeation rate of polystyrene membranes and the urea permeation rate of polystyrene/wood powder composite membranes are obviously higher than that of polystyrene membrane. The urea permeation rate of composite membranes increased with increasing wood powder content gradually. Optics microphotographs showed that microfibril structure within wood powder was obvious, wood powder in composite membrane swelled and became the fast permeation channels for urea when the composite membrane was immersed in water.

摘要： 采用48 µm和150 µm木粉为填料制备了聚苯乙烯/木粉复合膜，考察了木粉含量、复合膜厚、木粉粒径对复合膜透过性能的影响。结果表明，木粉可以很有效地调控聚苯乙烯膜对尿素的透过能力，复合膜对尿素的透过速度明显大于纯聚苯乙烯膜的透过速度；随着木粉含量的增加，复合膜对尿素的透过速度增加。光学显微镜观察发现，木粉中纤维状结构明显，复合膜在水中浸泡后其中木粉吸水溶胀，成为复合膜中尿素透过快速通道。