紫外照射改性SMS聚丙烯非织造布的制备及其微观结构与亲水性能

Preparation,microstructure and hydrophilicity of UV irradiation grafted SMS polypropylene nonwovens

在紫外照射下,分别将甲基丙烯酸羟乙酯(HEMA)和甲基丙烯酸环氧丙酯(GMA)接枝聚合到SMS聚丙烯非织造布表面,研究接枝聚合条件(单体体积分数、交联剂体积分数、光敏剂体积分数和照射时间)对接枝率的影响,利用红外光谱仪、扫描电镜、差示扫描量热仪和接触角仪等对改性SMS聚丙烯非织造布的结构和亲水性能进行测试和分析。结果表明:与反应性较强且疏水性较强的单体GMA相比,反应性较弱且亲水性强的单体HEMA的接枝率相对较低;亲水性HEMA不均匀地分布在非织造布表面及内部,疏水性GMA倾向在熔喷层接枝聚合;接枝聚合改性作用导致SMS聚丙烯非织造布的结晶度和熔点降低;且不论单体的亲疏水性,接枝聚合改性后SMS聚丙烯非织造布的亲水性只是略有改善;接枝聚合改性后SMS聚丙烯非织造布的水通量降低。

Hydroxyethyl methacrylate（ HEMA） and glycidyl methacrylate（ GMA） were grafted onto SMS polypropylene nonwovens under UV irradiation respectively. The effects of graft polymerization conditions,which were monomer volume fraction,crosslinker volume fraction,photosensitizer volume fraction and irradiation time,on graft rate were studied. And the microstructure and hydrophilicity of the grafted SMS polypropylene nonwovens were tested and analyzed with infrared spectroscopy,scanning electron microscopy,differential scanning calorimetry and water contact angle meter. The results showed that,the graft rate of HEMA with weak reactivity and strong hydrophilicity was relatively lower compared with that of GMA with strong reactivity and hydrophobicity. Hydrophilic HEMA was unevenly distributed on the surface and interior of nonwovens, while hydrophobic GMA tended to be grafted and polymerized in the meltblown layer. Graft polymerization resulted in the reduction of crystallinity and melting point of SMS polypropylene nonwovens. Regardless of the hydrophilic and hydrophobic properties of monomers,the hydrophilic properties of SMS polypropylene nonwovens after graft polymerization were only slightly improved. The water flux of SMS polypropylene nonwovens after graft polymerization was reduced.