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タイトル: | Synthesis of diblock copolymers with cellulose derivatives 4. Self-assembled nanoparticles of amphiphilic cellulose derivatives carrying a single pyrene group at the reducing-end |
著者: | Enomoto-Rogers, Yukiko Kamitakahara, Hiroshi https://orcid.org/0000-0002-0130-1919 (unconfirmed) Yoshinaga, Arata https://orcid.org/0000-0002-2935-3067 (unconfirmed) Takano, Toshiyuki |
著者名の別形: | 上高原, 浩 |
キーワード: | Cellulose Reducing-end Nanoparticle Self-assembly Radial orientation Fluorescent probe technique Pyrene |
発行日: | Aug-2011 |
出版者: | Springer Science+Business Media B.V. |
誌名: | Cellulose |
巻: | 18 |
号: | 4 |
開始ページ: | 1005 |
終了ページ: | 1014 |
抄録: | Self-assembled cellulose-pyrene nanoparticles were prepared from amphiphilic cellulose derivatives carrying a single pyrene group at the reducing-end, N-(1-pyrenebutyloyl)-β-cellulosylamine (CELL13Py and CELL30Py, the number average degrees of polymerization (DPn) of 13 and 30, respectively) and N-(15-(1-pyrenebutyloylamino)-pentadecanoyl)-β-cellulosylamine (CELL13C15Py and CELL30C15Py, DPn of 13 and 30, respectively). Transmission electron microscopy (TEM) observation revealed that CELL13C15Py and CELL30C15Py formed self-assembled nanoparticles with the average diameters of 108.8 and 40.0 nm, respectively. The average radius of CELL30C15Py nanoparticles (20.0 nm) agreed well with the molecular length of its cellulose chain (19.2 nm). CELL30C15Py nanoparticles were expected to have monolayered structure, consisting of cellulose shell with radial orientation and hydrophobic core of 15-(1-pyrenebutyloylamino)-pentadecanoyl groups. The fluorescent spectrum of CELL30C15Py nanoparticles showed an excimer emission due to dimerized pyrene groups, indicating that the pyrene groups at the reducing-end of cellulose are associating in the particles. The balance of hydrophilic and hydrophobic parts of the cellulose derivatives controlled their self-assembled nanostructures. X-ray diffraction measurements revealed that radially oriented cellulose chains of CELL30C15Py nanoparticles were mostly amorphous, and at the same time exhibited weak reflection pattern of cellulose II, which is believed to have anti-parallel orientation. |
著作権等: | The final publication is available at www.springerlink.com This is not the published version. Please cite only the published version. この論文は出版社版でありません。引用の際には出版社版をご確認ご利用ください。 |
URI: | http://hdl.handle.net/2433/149212 |
DOI(出版社版): | 10.1007/s10570-011-9549-4 |
出現コレクション: | 学術雑誌掲載論文等 |
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