適した濡れやすさのスイッチング動力学と再構築の可逆性の対応した反応性のある表面を作成します
1Department of Chemical and Biomolecular Engineering, North Carolina State University, Raleigh, North Carolina 27695-7905, USA.
Journal of the American Chemical Society
|December 15, 2005
まとめ
反応性のあるエラストマー表面は,ポリ (ビニルメチルシロキサン) ネットワークを改造することによって作成されました. これらの表面は,調節可能な水誘発再構成を示し,より短いメチレン間隔器のより速い運動学により,耐久性があり,低ヒステレス湿透性の切り替えを可能にします.
科学分野:
- 材料科学 材料科学とは
- ポリマー化学のポリマー化学について
- 表面科学とは,地表科学である.
背景:
- レスポンシブ素材は,表面の特性に対するダイナミックな制御を提供します.
- 調節可能な表面再構築を持つ弾性物質は,高度なアプリケーションに価値があります.
- 表面再編成運動とヒステリシスの制御は,材料の性能にとって極めて重要です.
研究 の 目的:
- 適応可能な表面再構築動力学とスイッチングヒステレシスを備えた反応性のある表面を開発する.
- メルカプトアルカノール鎖の長さの表面行動への影響を調査する.
- 表面の再編成と湿透性の切り替えを制御するメカニズムを理解する.
主な方法:
- メルカプトアルカノールのチオレン基がポリ (ビニルメチルシロキサン) ネットワークに添加される.
- 異なるメチレン間隔長 (n) のエラストモア表面の製造.
- 水接触角の測定により,湿度変化と運動を定量化します.
- 半結晶領域形成などの構造変化を検出するための赤外線 (IR) スペクトロスコーピー.
主要な成果:
- 表面再構築運動は,メチレンスペーサー (n) の増加とともに減少した.
- n=2とn=6.2で観測された急速反応運動 (例えば,n=3の場合で~2度/s)
- 材料は,最小限のヒステレシスで10サイクル以上の長寿を切り替えることを実証しました.
- n (n=11) が増加すると,表面の再編成が劇的に減少し,最終的に表面が凍り付く.
- 半結晶領域の形成は,運動の鈍化と表面の凍結と相関しています.
結論:
- 調整可能な表面再構築運動学とヒステリシスは,制御されたメルカプトアルカノール鎖の長さによって達成されます.
- シロキサンのバックボーンの柔軟性は,長寿命と低ヒステリーシスのスイッチングを保証します.
- 半結晶の領域による表面の凍結は,より長い鎖の長さの応答性を制限します.
- これらの発見は,予測可能な表面行動を持つ高度な反応性材料の設計を可能にします.
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