聚苯乙烯蜂窝状多孔膜的制备及应用

以线性聚苯乙烯(PS)为膜材料,采用Breath Figures法制备了高度规整的蜂窝状结构多孔膜.研究了溶液浓度、环境湿度、气体吹扫速度及不同溶剂对多孔膜结构的影响.结果表明,相比于苯和二氯甲烷,氯仿作为溶剂因其挥发度适宜,PS浓度在20～80mg/mL的铸膜溶液可形成规整的蜂窝状结构多孔膜,且膜孔分布均匀、大小均一；制膜的湿度需高于环境湿度,但随着湿度的增加孔径增大；气体吹扫速度可在400～1000mL/min范围,但吹扫速度较大时孔径略有降低.该膜可作为固定诸如辣根过氧化酶等活性酶的载体,用于酶催化反应.

Synthesis and application of polystyrene porous film with honeycomb pattern

The porous films with well-ordered honeycomb structure were prepared by Breath Figures method using linear polystyrene(PS) without polar groups.The casting solutions were prepared by solving PS with organic solvents such as chloroform,benzene and dichloromethane.The prepared films were characterized by SEM.Some effects including solution concentration,environment humidity,air flow rate and solvent type were investigated.It was found that the porous films with well-ordered honeycomb structure can be prepared using chloroform as the solvent owing to its suitable volatility,while could not be prepared using benzene and dichloromethane as solvents because of their higher or lower volatility.When the concentration of PS was in the range from 20 to 80 mg/mL,the condensed water on the solution surface could be effectively wrapped and fixed by PS,as a result well-ordered honeycomb pattern can be formed.The blowing air humidity should be higher than that of environment,and the pore size increased with the increase in the blowing air humidity.Well-ordered honeycomb structure porous films can be formed under the air flow rates ranging from 400 to 1000mL/min,and the pore size increased slightly with the air flow rate.The resulted films can be used to fix enzyme such as HRP,which has promising use in catalysis.