単一壁の炭素ナノチューブ上のポリマーブラシは,n-ブチルメタクリlateの原子移転による過激なポリメリゼーションによる
Shuhui Qin1, Dongqi Qin, Warren T Ford
1Department of Chemistry, Oklahoma State University, Stillwater, Oklahoma 74078, USA.
Journal of the American Chemical Society
|January 8, 2004
まとめ
単一壁の炭素ナノチューブ (SWNT) は,原子移転ラジカルポリメリゼーション (ATRP) を使用したポリマーブラシで機能化されました. このプロセスはSWNTの溶解性を高め,束を個々のチューブに分解し,材料の性質を改善しました.
科学分野:
- マテリアルサイエンス 材料科学
- ポリマー化学のポリマー化学について
- ナノテクノロジー ナノテクノロジー
背景:
- シングルウォールカーボンナノチューブ (SWNT) はユニークな性質を有していますが,溶解性や集積性が悪いことが多いです.
- SWNTの機能化は,先進的な材料とアプリケーションへの統合に不可欠です.
研究 の 目的:
- SWNTの背骨に埋め込まれたポリマーブラシを合成するために.
- SWNTの溶解性および構造に対するポリマー接合の効果を調査する.
- 原子移転ラジカルポリメリゼーション (ATRP) を用いてポリマー増殖を制御する.
主な方法:
- ATRP経由でSWNTからn-ブチルメタクリlate (nBMA) を移植する.
- 窒酸酸化を用いたカルボキシル酸群によるSWNTの機能化.
- SECとTGAを用いたポリマーの分子量と移植密度の特徴.
- 顕微鏡とAFMを用いてSWNTの構造と溶解性を分析する.
主要な成果:
- 制御された分子量でSWNTにポリマーブラシの成功合成.
- 機能化されたSWNTの一般的有機溶媒における溶解性の向上.
- 機能化とポリメリゼーション後にSWNT束が個々のチューブに分解した証拠.
- プロセス中にSWNTサイドウォールの機能に最小限の変更があります.
結論:
- ATRPによるポリマー・グラフティングは,SWNTの溶解性と処理性を改善する効果的な方法である.
- 機能化およびポリメリゼーションプロセスは,SWNTの解体につながります.
- このアプローチは,よく定義されたSWNT-ポリマーナノ複合材料を作成するための経路を提供します.
関連する概念動画
Nuclear Fission
Many heavier elements with smaller binding energies per nucleon can decompose into more stable elements that have intermediate mass numbers and larger binding energies per nucleon—that is, mass numbers and binding energies per nucleon that are closer to the “peak” of the binding energy graph near 56. Sometimes neutrons are also produced. This decomposition of a large nucleus into smaller pieces is called fission. The breaking is rather random with the formation of a large number of different...
Nuclear Transmutation
Nuclear transmutation is the conversion of one nuclide into another. It can occur by the radioactive decay of a nucleus, or the reaction of a nucleus with another particle. The first manmade nucleus was produced in Ernest Rutherford’s laboratory in 1919 by a transmutation reaction, the bombardment of one type of nuclei with other nuclei or with neutrons. Rutherford bombarded nitrogen-14 atoms with high-speed α particles from a natural radioactive isotope of radium and observed protons being...
¹H NMR: Complex Splitting
A proton M that is coupled to a proton X results in doublet signals for M. However, NMR-active nuclei can be simultaneously coupled to more than one nonequivalent nucleus. When M is coupled to a second proton A, such as in styrene oxide, each peak in the doublet is split into another doublet.
Splitting diagrams or splitting tree diagrams are routinely used to depict such complex couplings. While drawing splitting diagrams, the splitting with the larger coupling constant is usually applied first.
Splitting diagrams or splitting tree diagrams are routinely used to depict such complex couplings. While drawing splitting diagrams, the splitting with the larger coupling constant is usually applied first.
Radical Formation: Homolysis
A bond is formed between two atoms by sharing two electrons. When this bond is broken by supplying sufficient energy, either two electrons can be taken up by one atom forming ions by the cleavage called heterolysis, or the two electrons are shared by two atoms, with one each creating radicals by the cleavage called homolysis.
π Electron Effects on Chemical Shift: Overview
An applied magnetic field causes loosely bound π-electrons in organic molecules to circulate, producing a local or induced diamagnetic field over a large spatial volume. As the molecules tumble in solution, the field generated by π-electrons in spherical substituents results in a zero net field. However, the net field generated by π-electrons in non-spherical substituents is not zero. The effect of this induced field depends on the orientation of the molecule with respect to B0, resulting in...
¹³C NMR: ¹H–¹³C Decoupling
The probability of having two carbon-13 atoms next to each other is negligible because of the low natural abundance of carbon-13. Consequently, peak splitting due to carbon-carbon spin-spin coupling is not observed in spectra. However, protons up to three sigma bonds away split the carbon signal according to the n+1 rule, resulting in complicated spectra.
A broadband decoupling technique is used to simplify these complex, sometimes overlapping, signals. Broadband decoupling relies on a...
A broadband decoupling technique is used to simplify these complex, sometimes overlapping, signals. Broadband decoupling relies on a...


