动态线纺聚乙烯醇/海藻酸钠纳米纤维膜的制备

Preparation of Dynamic Linear Spinning Polyvinyl Alcohol/Alginate Nanofiber Membranes

为了实现静电纺纳米纤维产量化的制备,使用自主设计的无针式动态线性电极静电纺丝机制备聚乙烯醇(PVA)/海藻酸钠(SA)(AP)纳米纤维膜。采用扫描电子显微镜(SEM)研究PVA/SA配比、收集距离和纺丝电压对纤维形貌及直径分布的影响。结果表明,PVA/SA配比对纤维形貌影响最大,随着SA含量降低,溶液牵伸顺利;在此基础上随着距离增加,纤维形貌逐渐改善但不匀率有所增加。当7.5%PVA与2%SA按体积比9∶1共混时,所得纤维形貌及直径分布最佳,最佳纺丝电压和距离分别为75 kV和25 cm,纤维平均直径为(187±44)nm,产量可达2.5 g/h。为AP纳米纤维膜的规模化制备提供了参考。

For realizing high production of electro-spun nanofibers, polyvinyl alcohol(PVA)/sodium alginate(SA)(AP) nanofiber membranes were prepared by a self-designed needleless dynamic linear electrode electrospinning machine. The influences of PVA/SA ratio, distance and spinning voltage on the morphology and diameter distribution of fibers were studied by scanning electron microscopy(SEM). The results show the ratio of PVA/SA has the greatest influence on the morphology of spun fibers. With the decrease of SA content, the solution drafting was smooth. On this basis, as the distance increases, the fiber morphology is gradually improved, and the unevenness rate is increased. When 7.5% PVA and 2% SA are blended by the volume ratio of 9∶1, the fiber morphology and diameter distribution are optimal. The optimum spinning voltage and distance are 75 kV and 25 cm, respectively. The average fiber diameter is(187±44) nm and the yield can reach 2.5 g/h. This study provides a reference for the large-scale preparation of AP nanofiber membranes.