超高交联非织造布的制备及其对苯乙烯气体的吸附性能

摘要

为了能够有效去除废气中的苯乙烯气体,以聚丙烯(PP)非织造布为基材,通过表面接枝苯乙烯(ST)和二乙烯基苯(DVB),之后分别使用3种交联剂4′4-二甲基联苯(CMDP)、二氯甲基苯(DCX)、二甲氧基甲烷(FDA)再进行后交联的方法,制备对苯乙烯具有吸附性能的超高交联非织造布(HCN)材料.并采用扫描电子显微镜(SEM)、傅里叶变换红外光谱仪(FT-IR)、静态氮吸附仪(BET)和接触角测试对非织造布表面形貌进行了表征.重点研究了交联剂分子结构构建多孔三维交联层的调控机制和交联非织造布表面多孔结构及化学基团特性对苯乙烯分子的吸附性能.结果表明:当ST和DVB接枝率为200%、使用4′4-二甲基联苯(CMDP)时,HCN-CMDP的比表面积可达到446.67 m2/g,对苯乙烯吸附能力遵循HCN-CMDPHCN-DCXHCN-FDA材料,最大吸附量可达到353.6 mg/g.%In order to remove styrene in the exhaust gas effectively,a hypercross-linked nonwoven was fabricated by grafting copolymerization of styrene and divinyl benzene and post crosslinking on the surface of polypropylene nonwoven. Three kinds of cross-linked agent such as 4,4′-dimethylbiphenyl(CMDP), benzylenechloride(DCX)and dimethoxymethane(FDA)were chosen to be used in cross linking reaction.These nonwoven were characterized by scanning electron microscopy,FTIR spectroscopy,N2adsorption/desorption isotherms and contact angle.The regulation mechanism of crosslinker molecular structure on the porous three-dimensional crosslinking layer and the adsorption properties of styrene molecules were studied emphatically.It was found that the HCN-CMDP had the highest surface area(446.67 m2/g)when grafting rate was 200% and using 4,4′-dimethylbiphenyl(CMDP)as cross-linked agent. The adsorption capacities of HCNS for styrene accord with HCN-CMDP HCN-DCX HCN-FDA.The maximum adsorption capacity of HCN-CMDP for styrene could reach 353.6 mg/g.