非织造布上疏水链段分布对苯乙烯气体吸附效果的影响

Influence of Hydrophobic Chains Distribution in the Polypropylene Nonwoven Fabric on the Adsorption of Styrene Gas

针对低成本有效去除环境中有害苯乙烯气体的需求,分别采用紫外(UV)和高能电子束(EB)辐照引发在聚丙烯(PP)非织造布上接枝丙烯酸十二酯,制备了能够快速吸附苯乙烯气体的功能非织造布。用衰减全反射傅里叶变换红外光谱、接触角和扫描电子显微镜对接枝前后非织造布的疏水烷基链段分布和形貌进行了表征,重点研究了在不同吸附温度和气体流速条件下疏水烷基链段分布对苯乙烯气体吸附效果的影响规律。结果表明,UV引发疏水烷基链段只分布在非织造布表层;EB引发疏水烷基链段相对均匀地分布在非织造布表层和内层。当接枝率为132%左右时,对苯乙烯气体的吸附透过时间由PP非织造布的50 min分别增加到UV引发接枝的80 min和EB引发接枝的120 min。

In order to removal the harmful styrene from the environment,a new cost-effective adsorbent was prepared through graft polymerization of lauryl acrylate in the polypropylene( PP) nonwoven fabric initiated by ultraviolet( UV)and high energy electron beam( EB). The chemical and morphological changes of the PP nonwoven fabric and grafted nonwoven fabric were characterized by the Fourier transform infrared( FT-IR) attenuated total reflectance( ATR),contact angle( CA) and scanning electron microscopy( SEM),the distribution of hydrophobic alkyl chains influencing the adsorption capacity were discussed at the different adsorption temperature and flow rate. The results indicate that the hydrophobic alkyl chains are only distributed in the surface of nonwoven fabric initiated by UV,however the hydrophobic alkyl chains are dispersed in the inner and outer surface of nonwoven fabric initiated by EB. Contrasted with the PP nonwoven fabric,when the degree of grafting is similar to 132. 0% initiated by UV and EB,the breakthrough time increases from 50 min to 80 min and 120 min respectively.