分割され,よく特徴づけられたリンギン基の調節可能な熱固化エポキシ
Claudio Gioia1, Giada Lo Re1, Martin Lawoko1
1Wallenberg Wood Science Center, WWSC, Department of Fiber and Polymer Technology , KTH Royal Institute of Technology , 100 44 Stockholm , Sweden.
Journal of the American Chemical Society
|March 3, 2018
まとめ
この研究は,クラフト・リグニンから新しい熱固性樹脂を合成し,エポキシ形成のためにオキシラン群を導入します. リグニンの構造は,最終的なエポキシ耐熱性特性に直接影響し,マテリアルデザインを可能にします.
科学分野:
- ポリマー化学
- 材料科学
- バイオマスの利用
背景:
- クラフト・リグニンは,パルプの副産物であり,芳香ポリマーの豊富な,しかし十分に活用されていない源です.
- リグニンの高価値アプリケーションの開発は,持続可能な化学産業にとって極めて重要です.
- 既存のリグニンベースの熱固体は,しばしば予測可能な構造-特性関係がない.
研究 の 目的:
- 特定の低モラ質量クラフト・リグニン分子の熱固性エポキシ樹脂を合成し,特徴づけること.
- 生成されたエポキシ熱セットの熱力学的性質に対するリグニン構造の変化の影響を調査する.
- リンニン基構造と最終的なエポキシネットワークの性能との間直接的な相関を確立する.
主な方法:
- 高機能クラフトリンニン分子を分離するために溶媒抽出.
- P NMR,2D-HSQC NMR,SEC,DSCを用いた包括的な構造的特徴づけ
- リグニンの化学的改変により,H NMRで定量化された反応性オキシラン分子を導入する.
- リグニンとポリエーテルダイアミンが交互に結合し,エポキシ熱セットを形成する.
- DSC,DMA,引力試験,SEMによる熱力学的性質の評価
主要な成果:
- 精製されたクラフト・リグニン分から熱固化エポキシ樹脂を成功して合成した.
- 異なるリグニン構造から派生したエポキシの間の熱力学的特性 (例えば,ガラス化変換温度,モジュール) の有意な変動が示されている.
- 特定のリグニン分子特性をエポキシネットワークの性能と結びつける明確な構造-特性関係を確立した.
- 軽い条件下でリンニン骨格にオキシラン群を導入した.
結論:
- この研究は,カスタマイズされたクラフト・リグニン分子を用いて,高性能の熱固体への実行可能な経路を示しています.
- リグニンの構造特性とエポキシ熱固体特性との間の直接的な相関は初めて達成された.
- このアプローチは,実際のリグニン原料を用いたリグニンベースのエポキシ材料の設計とチューニングのための強力なプラットフォームを提供し,モデル化合物を超えています.
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