Production of nanofibers by electrospinning under pressurized CO2
Production of nanofibers by electrospinning under pressurized CO2
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DOI：
10.1080/08957959.2011.645474
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发表时间：
2012-03
影响因子：
2
通讯作者：
Wahyudiono;Kanako Murakami;S. Machmudah;M. Sasaki;M. Goto
中科院分区：
文献类型：
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作者：
Wahyudiono;Kanako Murakami;S. Machmudah;M. Sasaki;M. Goto
静电纺丝是制备聚合物纳米粒子和纳米纤维的一种简单的技术方法。近年来，各种聚合物被成功地电纺成超细粒子和纤维，主要是在溶剂溶液中，也有一些是熔融形式的。在本工作中，使用了近临界和超临界CO2作为该过程的介质。在这些条件下，可以通过控制温度和压力来调节溶解度。因此，在生物聚合物已经软化但没有溶解的热力学窗口内形成颗粒和纤维是可能的。实验是在∼8.0Mpa、温度313K的加压CO_2系统下，采用静电纺丝的方法制备了几种聚合物纤维。以聚乙烯吡咯烷酮为起始原料。在电纺过程中，外加电压为10-17千伏，喷嘴和集电极之间的距离为8 cm。聚合物溶液浓度为4wt%。用扫描电子显微镜观察了纤维的形态和结构。结果表明，在加压CO2中，温度和压力对电纺纤维的形态有影响。这表明，以CO2为溶剂，通过调节压力和温度来调节聚合物的热行为，可以优化聚合物的热行为。
Electrospinning is one of the simple technical methods for the production of polymer nanoparticles and nanofibers. Various polymers have been successfully electrospun into ultrafine particles and fibers in recent years mostly in solvent solution and some in melt form. In this work, near- and supercritical CO2 were used as media for this process. At these conditions, the solubility can be tuned by controlling the temperature and pressure. Therefore, it is possible to form particles and fibers within a thermodynamic window where the biopolymer has been softened, but not dissolved. The experiments were conducted by using electrospinning under pressurized CO2 system at pressures of ∼ 8.0 MPa and temperature of 313 K to produce several polymers fibers. Polyvinylpyrrolidone was used as the starting material. During the electrospinning process, the applied voltage was 10–17 kV and the distance of nozzle and collector was 8 cm. The concentration of polymer solution was 4 wt%. The morphology- and structure-produced fibers were observed by scanning electron microscopy. The results showed that temperature and pressure affected the morphology of fibers produced by electrospinning in pressurized CO2. This suggests that the thermal behavior of the polymer can be optimized by adjusting the polymer through the adjustment of pressure and temperature by using CO2 as a solvent.