Morphology control of PLA microfibers and spheres via melt electrospinning
2018; IOP Publishing; Volume: 5; Issue: 4 Linguagem: Inglês
10.1088/2053-1591/aab9f4
ISSN2053-1591
AutoresShuxin Yu, Jie Zheng, Xu Yan, Xiao-Xiong Wang, Guangdi Nie, Yeqiang Tan, Jun Zhang, Kunyan Sui, Yun‐Ze Long,
Tópico(s)biodegradable polymer synthesis and properties
ResumoIn conventional solution electrospinning, the morphologies (e.g., spheres, beaded fibers, and fibers) of electrospun products can be controlled by solution concentration. Here, we report that the morphologies and structures of polylactic acid (PLA) via melt electrospinning also can be adjusted from microfibers to microspheres by simply increasing the spinning temperature. It was found that with temperature increasing from 200 °C to 240 °C, the average diameter of melt-electrospun PLA fibers decreased from 58.46 to 2.96 μm. Then, beaded fibers and microspheres about 14.5 μm in diameter were collected when the spinning temperature was increased to 250 °C and 260 °C. In addition, we also found that the average PLA fiber diameter decreased with increasing the applied spinning voltage, and increased with the increase of spinning distance. To explain the formation mechanism of different PLA microstructures, rheological property and infrared spectra of PLA under different spinning temperatures were also tested.
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