| DUAN Xian-fa,LI Ling,YU Yong-jian.Preparation of Poly (Lactic Acid) Nanofiber Film by Breath Figures Method[J],48(4):209-214 |
| Preparation of Poly (Lactic Acid) Nanofiber Film by Breath Figures Method |
| Received:August 16, 2018 Revised:April 20, 2019 |
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| DOI：10.16490/j.cnki.issn.1001-3660.2019.04.030 |
| KeyWord:poly (lactic acid) breath figures method nanofiber film morphology diameter distribution porosity |
| Author | Institution |
| DUAN Xian-fa |
North University of China, Taiyuan , China |
| LI Ling |
North University of China, Taiyuan , China |
| YU Yong-jian |
North University of China, Taiyuan , China |
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| Abstract: |
| The work aims to prepare the micro/nano fibers film via breath figures method, and study the effect of polymer concentration and ambient humidity (relative humidity) on the morphology and diameter of micro/nano fibers. The PLLA mi-cro/nano fiber membrane was prepared under different mass concentrations (10, 25, 50 mg/mL) of PLLA/tetrahydrofuran (THF) solution and different ambient humidity (40%, 50%, 60%, 70%). The morphology of the micro/nano fibers was observed by scanning electron microscopy (SEM), the diameter of micro/nano fibers was counted by image analysis software and the average diameter and diameter distribution were calculated. The surface-to-volume ratio of the film was calculated by the average diameter of the fibers. The porosity of the film was calculated by the density method. PLLA nanofiber film prepared by breath figures method had a diameter range of 200~1000 nm, porosity >90% and surface-to-volume ratio range of 6~8 μm-1 with a smooth and continuous three-dimensional network-like structure. The diameter rose as the concentration of the polymer solution increased, and decreased first and then increased with the increase of ambient humidity. The change law of porosity and surface-to-volume ratio was opposite to that of the diameter. The characteristic 3D nanofibrous architecture of PLLA film is mainly formed by the combination thermal induced phase separation (TIPS) with water assisted breath figure mechanism, because of the sharp tem-perature drop caused by the quick solvent evaporation in the process. The optimal parameters to prepare microlnano fibers film are 50 μL (the dosage of PLLA solution), 300 mL/min (gas flow rate), 25 mg/mL (polymer concentration), 50% (environmental humidity) under 25 ℃ dynamic atmosphere with THF as solvent. The microlnano fibers have a diameter ranging from 200 to 900 nm and an average diameter of 476 nm. The porosity and surface-to-volume ratio of the film are up to 96.7% and 8.4 μm-1, respec-tively. |
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