Biodegradable poly(l-lactic acid) nanofiber prepared by a carbon dioxide laser supersonic drawing |
| |
Authors: | Akihiro Suzuki Keiko Aoki |
| |
Institution: | University of Yamanashi, Interdisciplinary Graduate of School of Medicine and Engineering, Takeda-4, Kofu 400-8511, Japan |
| |
Abstract: | Biodegradable poly(l-lactic acid) (PLLA) nanofiber was prepared by a carbon dioxide (CO2) laser supersonic drawing which was carried out by irradiating the laser on an as-spun fiber in a supersonic jet. The supersonic jet was generated by blowing off air into a vacuum chamber from a fiber supplying orifice. The flow velocity from the orifice can be estimated by applying Graham’s theorem from the pressure difference between the atmospheric pressure and the pressure of the vacuum chamber. The fastest flow velocity estimated was 396 m s−1 when the chamber pressure was 6 kPa. The PLLA nanofiber having an average diameter of 0.132 μm was obtained when the supersonic drawing was carried out by irradiating the laser at 177 W cm−2 on the as-spun fiber supplied at 0.1 m min−1 in the vacuum chamber at 6 kPa. The obtained nanofiber had a draw ratio of about 323,000 and a degree of crystallinity of 45%, and its diameter uniformity was high. The CO2 laser supersonic drawing was a new route for preparation of various nanofibers without using any solvent. |
| |
Keywords: | l-lactic acid)" target="_blank">Poly (l-lactic acid) Nanofiber SEM |
本文献已被 ScienceDirect 等数据库收录! |