| Автор | Yoshikawa, Chiaki |
| Автор | Zhang, Kun |
| Автор | Zawadzak, Ewelina |
| Автор | Kobayashi, Hisatoshi |
| Дата выпуска | 2011-02-01 |
| dc.description | We report the fabrication of shortened electrospun polymer fibers with a well-defined concentrated polymer brush. We first prepared electrospun nanofibers from a random copolymer of styrene and 4-vinylbenzyl 2-bromopropionate, with number-average molecular weight M<sub>n</sub>=105 200 and weight-average molecular weight M<sub>w</sub>=296 700 (M<sub>w</sub>/M<sub>n</sub>=2.82). The fibers had a diameter of 593±74 nm and contained initiating sites for surface-initiated atom transfer radical polymerization (SI-ATRP). Then, SI-ATRP of hydrophilic styrene sodium sulfonate (SSNa) was carried out in the presence of a free initiator and the hydrophobic fibers. Gel permeation chromatography confirmed that M<sub>n</sub> and M<sub>w</sub>/M<sub>n</sub> values were almost the same for free polymers and graft polymers. M<sub>n</sub> agreed well with the theoretical prediction, and M<sub>w</sub>/M<sub>n</sub> was relatively low (<1.3) in all the examined cases, indicating that this polymerization proceeded in a living manner. Using the values of the graft amount measured by Fourier transform infrared spectroscopy, the surface area, and M<sub>n</sub>, we calculated the graft density σ as 0.22 chains nm<sup>−2</sup>. This value was nearly equal to the density obtained on silicon wafers (σ=0.24 chains nm<sup>−2</sup>), which is categorized into the concentrated brush regime. Finally, we mechanically cut the fibers with a concentrated poly(SSNa) brush by a homogenizer. With increasing cutting time, the fiber length became shorter and more homogenous (11±17 μm after 3 h). The shortened fibers exhibited excellent water dispersibility owing to the hydrophilic poly(SSNa) brush layer. |
| Формат | application.pdf |
| Издатель | Institute of Physics Publishing |
| Копирайт | 2011 National Institute for Materials Science |
| Название | A novel shortened electrospun nanofiber modified with a ‘concentrated’ polymer brush |
| Тип | paper |
| DOI | 10.1088/1468-6996/12/1/015003 |
| Electronic ISSN | 1878-5514 |
| Print ISSN | 1468-6996 |
| Журнал | Science and Technology of Advanced Materials |
| Том | 12 |
| Первая страница | 15003 |
| Последняя страница | 15009 |
| Аффилиация | Yoshikawa, Chiaki; World Premier International Center for Materials Nanoarchitectonics, National Institute for Materials Science, Tsukuba, Ibaraki 305-0044, Japan |
| Аффилиация | Zhang, Kun; World Premier International Center for Materials Nanoarchitectonics, National Institute for Materials Science, Tsukuba, Ibaraki 305-0044, Japan |
| Аффилиация | Zawadzak, Ewelina; World Premier International Center for Materials Nanoarchitectonics, National Institute for Materials Science, Tsukuba, Ibaraki 305-0044, Japan |
| Аффилиация | Kobayashi, Hisatoshi; Bomaterials Center, National Institute for Materials Science, Tsukuba, Ibaraki 305-0047, Japan; CREST, JST, Sanbancho, Chiyoda, Tokyo 102-0075, Japan |
| Выпуск | 1 |
