PHBV/PCL静电纺纤维膜的低温等离子处理研究

Low-temperature plasma treatment of PHBV/PCL electrospun fiber membrane

采用氮气和氦气作为处理气氛,对聚羟基丁酸羟基戊酸共聚酯(PHBV)/聚己内酯(PCL)静电纺纤维膜进行等离子体表面改性处理,以改善纤维膜的亲水性。通过接触角测试表征其亲水性,探讨了等离子体处理工艺对亲水性的影响;用X射线光电子能谱(XPS)仪测定纤维膜的表面基团含量,对比氮气和氦气的处理效果;用扫描电镜测试纤维膜表面的微观形态变化。结果表明:PHBV/PCL纤维膜在氮气和氦气气氛下,经等离子体处理对纤维膜的亲水性改善效果显著,氮气的处理效果优于氦气;随着处理功率或处理时间的增加,纤维膜的亲水性呈现先增强后减弱的趋势;在氮气气氛,处理功率30 W,时间2 min条件下,等离子体处理对纤维膜的表面有一定的刻蚀作用,且随着处理功率的增加而趋于明显,但纤维膜的质量损失不显著。

The surface of poly（hydroxybutyrate-co-hydroxyvalerate） （ PHBV）/polycaprolactone （PCL） electrospun fiber mem- brane was modified by nitrogen and helium plasma treatment to improve their hydrophilicity. The contact angles were tested to characterize the hydrophilicity. The effects of plasma treatment conditions on the hydrophilicity of the fiber membrane were dis- cussed. The changes in the surface group amount were measured by X-ray photoelectron spectrometry （XtX3）. The nitrogen and helium treatment effects were compared. The change in the micro-morphology of fiber membrane surface was characterized by scanning electron microscopy （SEM）. The results showed that plasma treatment provided a profound improvement of the hydro- philicity of PHBV/PCL fiber membrane in nitrogen or helium atmosphere, and nitrogen offered better treatment effect than heli- um; the hydrophilicity of the fiber membrane was increased first and then decreased while increasing the treating power or time; plasma treatment had a certain etching effect on the fiber membrane surface, which tended to be remarkable while increasing the treating power, but did not have a profound effect on the weight loss of the fiber membrane; and the optimal treatment conditions were nitrogen atmosphere, treating power 30 W and time 2 min.