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Dynamics of melt-electrospinning and its application to the micro-fiber formation of biopolymers
http://hdl.handle.net/10212/2502
http://hdl.handle.net/10212/2502d7ed8ac7-fbdc-49cd-87f9-fda1a190c3f1
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全文 (26.4 MB)
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内容・審査結果の要旨 (176.1 KB)
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| Item type | 学位論文 / Thesis or Dissertation(1) | |||||||||
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| 公開日 | 2021-08-26 | |||||||||
| タイトル | ||||||||||
| タイトル | Dynamics of melt-electrospinning and its application to the micro-fiber formation of biopolymers | |||||||||
| 言語 | en | |||||||||
| その他のタイトル | ||||||||||
| その他のタイトル | 溶融電界紡糸の動力学的解析とバイオマイクロファイバーの形成 | |||||||||
| 言語 | ja | |||||||||
| 作成者 |
ジョ, ワイチュウ
× ジョ, ワイチュウ
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| アクセス権 | ||||||||||
| アクセス権 | open access | |||||||||
| アクセス権URI | http://purl.org/coar/access_right/c_abf2 | |||||||||
| 主題 | ||||||||||
| 言語 | en | |||||||||
| 主題Scheme | Other | |||||||||
| 主題 | melt-electrospinning | |||||||||
| 主題 | ||||||||||
| 言語 | en | |||||||||
| 主題Scheme | Other | |||||||||
| 主題 | micro-fiber | |||||||||
| 主題 | ||||||||||
| 言語 | en | |||||||||
| 主題Scheme | Other | |||||||||
| 主題 | biopolymers | |||||||||
| 主題 | ||||||||||
| 言語 | en | |||||||||
| 主題Scheme | Other | |||||||||
| 主題 | dynamics | |||||||||
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| 言語 | en | |||||||||
| 主題Scheme | Other | |||||||||
| 主題 | spinnability | |||||||||
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| 言語 | en | |||||||||
| 主題Scheme | Other | |||||||||
| 主題 | poly(lactic acid) | |||||||||
| 主題 | ||||||||||
| 言語 | en | |||||||||
| 主題Scheme | Other | |||||||||
| 主題 | cellulose | |||||||||
| 主題 | ||||||||||
| 言語 | en | |||||||||
| 主題Scheme | Other | |||||||||
| 主題 | poly(3-hydroxybutyrate-co-3-hydroxyhexnoate) | |||||||||
| 主題 | ||||||||||
| 言語 | en | |||||||||
| 主題Scheme | Other | |||||||||
| 主題 | core/sheath | |||||||||
| 主題 | ||||||||||
| 言語 | en | |||||||||
| 主題Scheme | Other | |||||||||
| 主題 | ionic liquid | |||||||||
| 主題 | ||||||||||
| 言語 | en | |||||||||
| 主題Scheme | Other | |||||||||
| 主題 | gelation | |||||||||
| 主題 | ||||||||||
| 言語 | en | |||||||||
| 主題Scheme | Other | |||||||||
| 主題 | mechanical properties | |||||||||
| 主題 | ||||||||||
| 言語 | en | |||||||||
| 主題Scheme | Other | |||||||||
| 主題 | wide-angle X-ray diffraction | |||||||||
| 主題 | ||||||||||
| 言語 | en | |||||||||
| 主題Scheme | Other | |||||||||
| 主題 | differential scanning calorimeter | |||||||||
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| 言語 | en | |||||||||
| 主題Scheme | Other | |||||||||
| 主題 | dimensionless numbers | |||||||||
| 内容記述 | ||||||||||
| 内容記述タイプ | Abstract | |||||||||
| 内容記述 | The thesis consists of three chapters on the dynamics of melt-electrospinning and its application to the micro-fiber formation of biopolymers. The first chapter investigated the fabrication of core-sheath microfibers and the relationships among processing parameters, crystalline structures and the mechanical properties. The tensile strength and the modulus of the as-spun and the drawn fibers increased with increasing the take-up velocities. When the take-up velocity was above 500 m/min, jet became unstable and started to break up at the tip of Taylor-cone, decreasing the mechanical properties of the fibers. The drawing process facilitated the crystallization of PLLA and PHBH, and the tensile strength and the modulus increased linearly with increasing the draw ratio. The crystal information displayed from WAXD patterns and DSC heating curves supported the results of the tensile tests.The second chapter discussed the fabrication of ultrafine cellulose fibers with pure ionic liquid in high concentration. The maximum solubility of cellulose in 1-butyl-3-methylimidazolium chloride (BmimCl) can reach up to 20 wt% when the solution was stirred at 110 oC for 2 hours. The cellulose-BmimCl solution was then processed into homogeneous gels through the methods of recrystallization and casting. Pure cellulose fibers with perfect morphologies were achieved after melt-electrospinning and coagulation. The results of WAXD and FTIR indicated that the cellulose fibers were amorphous and chemically stable.The third chapter studied the electrodynamics and spinnability of melt electrospinning. A temperature-voltage phase diagram was constructed to distinguish the regimes of the bending, the whipping, and the break-up of the jet. Jet breaks up periodically at the tip of Taylor-cone if the polymer viscosity is too low or the elongation rate is not high enough to stretch the jet. The elongation rate for each segment of the jet keeps almost constant at a certain melt temperature, while the elongation rate increases and the solidification point of the jet shifts from the Taylor-cone to the target with increasing melt temperature. An analytic equation is proposed to estimate the jet diameter along the spinline before jet solidifies. | |||||||||
| 言語 | en | |||||||||
| 日付 | ||||||||||
| 日付 | 2018-09-25 | |||||||||
| 日付タイプ | Issued | |||||||||
| 言語 | ||||||||||
| 言語 | eng | |||||||||
| 資源タイプ | ||||||||||
| 資源タイプ識別子 | http://purl.org/coar/resource_type/c_db06 | |||||||||
| 資源タイプ | doctoral thesis | |||||||||
| 出版タイプ | ||||||||||
| 出版タイプ | VoR | |||||||||
| 出版タイプResource | http://purl.org/coar/version/c_970fb48d4fbd8a85 | |||||||||
| 学位授与番号 | ||||||||||
| 学位授与番号 | 甲第905号 | |||||||||
| 学位名 | ||||||||||
| 言語 | ja | |||||||||
| 学位名 | 博士（工学） | |||||||||
| 学位授与年月日 | ||||||||||
| 学位授与年月日 | 2018-09-25 | |||||||||
| 学位授与機関 | ||||||||||
| 学位授与機関識別子Scheme | kakenhi | |||||||||
| 学位授与機関識別子 | 14303 | |||||||||
| 言語 | ja | |||||||||
| 学位授与機関名 | 京都工芸繊維大学 | |||||||||
