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Types of Step-Growth Polymers: Polyesters01:20

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The introduction of polyesters has brought major development to the textile industry. The wrinkle-free behavior of polyester blends has eliminated the need for starching and ironing clothes.
Polyesters are commonly prepared from terephthalic acid and ethylene glycol; the crude product is known as poly(ethylene terephthalate) or PET. However, polyesters are synthesized industrially by transesterification of dimethyl terephthalate with ethylene glycol at 150 °C. The two reactants and the...
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Elastic fiber contains the protein elastin along with lesser amounts of other proteins and glycoproteins. The main property of elastin is that it will return to its original shape after being stretched or compressed. Elastic fibers are prominent in elastic tissues found in skin and the elastic ligaments of the vertebral column.
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The behavior of elastoplastic materials under bending stresses, particularly in structural members with rectangular cross-sections, is crucial for predicting material responses and understanding failure modes. Initially, when a bending moment is applied, the stress distribution across the section follows Hooke's Law and is linear and elastic. This distribution means the stress increases from the neutral axis to the maximum at the outer fibers, up to the elastic limit.
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多段階の双方向性可変性のための液晶弾性体プログラミング

Yuxing Yao1,2, Atalaya Milan Wilborn3, Baptiste Lemaire3

  • 1Department of Chemistry and Chemical Biology, Harvard University, Cambridge, MA, USA.

Science (New York, N.Y.)
|December 5, 2024
PubMed
まとめ
この要約は機械生成です。

研究者らは,2つの対極な変形モードを示す,両方向の動きを可能にする新しい液晶弾性物質を開発した. 柔軟な材料の科学におけるこの突破は,高度な応用のための 拡張性のある複雑な変換を可能にします

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科学分野:

  • 材料科学
  • 柔らかい物質の物理
  • ポリマー化学

背景:

  • 双方向性 つまり2つの反対方向の動きは 自然に存在しますが 従来の柔らかい材料では 実現するのが難しいのです
  • 既存の柔らかい材料は,しばしば双方向変形のための複雑なハイブリッド設計を必要とし,それらの実用的なアプリケーションを制限します.

研究 の 目的:

  • 双方向の動きを示す新しい液晶弾性体 (LCE) の設計と合成.
  • LCEにおけるメソフェーズ移行と結果の変形モードの関係を調査する.

主な方法:

  • メソゲンの自己組み立て,ポリマー鎖の弾性,およびポリメリゼーション誘発のストレスの組み合わせを使用した.
  • チェブロン・スメクティックC (cSmC) とスメクティックA (SmA) の2つの異なるメソフェーズを示すように設計されたLCE.
  • cSmC-SmA-同位相移行を調査し,変形行動を誘導し,分析しました.

主要な成果:

  • LCEで両方向の動きを達成し,連続した収縮/膨張,歪み/傾きなどの反対の変形モードを示した.
  • cSmC-SmA同位相の移行中に微細構造の異常な反転が観察されました.
  • マクロスケールで高周波非単調な振動とスケーラブルなガウス変換を生成した.

結論:

  • 開発されたLCEは,制御されたメソフェーズトランジションを通じて,スケーラブルな両方向の動きを成功裏に示す.
  • 複雑でプログラム可能な変形能力を有する 柔らかい材料を設計するための 新しい経路を提供しています
  • この発見は ロボット,アクチュエータ,適応性構造に 潜在的影響を及ぼします