静电纺丝制备聚丙交酯超细纤维

Electrospinning and Morphology of Ultrafine Poly(D,L-lactide) Fibers

对溶液静电纺丝制备直径小于200 nm的超细聚D,L-丙交酯(PLA)纤维进行研究,以期获得与细胞外基质尺度相近的组织修复物.以扫描电镜观察纤维形貌,结果表明溶剂是决定PLA超细纤维形成的关键因素,与丙酮相比,N,N-二甲基甲酰胺是PLA静电纺丝较为理想的溶剂.在PLA溶液中加入有机盐三乙基苯氯化铵,可使溶液的电导率大大提高,从而导致PLA超细纤维直径从500 nm降低至100～200 nm.表面活性剂Span-80的加入并没有使PLA超细纤维变得更细,而是形成了带有珠状缺陷的纤维网.

Ultrafine poly （D, L-lactide） （PLA） fibers with diameter less than 200 nm produced by electrospinning were studied to obtain tissue restoration resembling extracellular matrix. Scanning electron microscopy was used to observe the fiber morphology. Results showed that the solvent was the critical factor to determine the formation of the electrospun PLA fibers. Compared with acetone, N,N-dimethylformamide （DMF） was a better solvent for PLA to electrospin. Entrance of an organic salt, triethylbenzylammoniumchlorate, led to a great increase of the conductivity of PLA/DMF solutions, so that the average fiber diameter of the electrospun PLA fibers decreased dramatically from 500 nm to 100-200 nm. The addition of surfactant, Span-80, did not improve the fiber morphology but formed beaded fiber web.