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関連する概念動画

Carbon Skeletons01:12

Carbon Skeletons

Life on Earth is carbon-based, as all macromolecules that make up living organisms contain carbon atoms. All organic compounds have a carbon backbone. Each carbon atom is tetravalent and can bond with four other atoms, making it an extraordinarily flexible component of biological molecules. Because carbon’s valence electrons are stable, it rarely becomes an ion. As the carbon chain increases in length, structural modifications such as ring structures, double bonds, and branching side chains...
Physical Properties of Carboxylic Acids01:31

Physical Properties of Carboxylic Acids

Carboxylic acids with lower molecular weight exhibit a sharp and unpleasant odor. They also have higher boiling and melting points than analogous compounds, such as aldehydes, ketones, and alcohols.
Plastic Deformations01:14

Plastic Deformations

It is essential to understand how structural members behave under plastic deformation when the bending stress exceeds the material's yield strength. This state of deformation permanently alters the shape of the member, in contrast to the linear elastic behavior observed before yielding. The strain at any point in the member is expressed in terms of maximum strain. Notably, the neutral axis, which coincides with the centroid during elastic bending, shifts away from the centroid under plastic...
Members Made of Elastoplastic Material01:19

Members Made of Elastoplastic Material

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.
As the bending moment...
Plastic Deformations01:19

Plastic Deformations

Plastic deformation represents a fundamental concept in materials science, which explains the irreversible change in the shape of a material when it experiences stress beyond its elastic capability. This phenomenon is important in structural engineering, especially in designing and analyzing cantilever beams—structures that are securely fixed at one end and bear loads at the opposite end. When these beams are subjected to loads within their elastic range, they will return to their original...
Classification and Mechanical Properties of Synthetic Polymers01:28

Classification and Mechanical Properties of Synthetic Polymers

Synthetic polymers are classified as elastomers, fibers, or plastics based on their crystallinity. Crystallinity, the degree of long-range order in the solid state, influences the mechanical properties (stretching or contracting) of elastomers. Elastomers are flexible polymers that can expand or contract easily upon the application of an external force. They have numerous crosslinks that pull them back into their original shape when stress is removed. Silicones, for instance, are highly elastic...

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Updated: Jul 15, 2026

Fabrication of a Bioactive, PCL-based "Self-fitting" Shape Memory Polymer Scaffold
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Published on: October 23, 2015

脊椎硬化オリゴ ((m-フェニレンエチニレン)) は,脊椎硬化オリゴ ((m-フェニレンエチニレン)) は,脊椎硬化オリゴ (m-フェニレンエチニレン) は,脊椎硬化オリゴ (m-フェニレンエチニレン) は,脊椎硬化オリゴ

Xiaowu Yang1, Lihua Yuan, Kazuhiro Yamato

  • 1Department of Chemistry, University at Buffalo, The State University of New York, Buffalo, New York 14260, USA.

Journal of the American Chemical Society
|March 12, 2004
PubMed
まとめ

研究者らは,分子内水素結合を用いて,硬いオリゴ ((m-フェニレンエチニレン) (oligo ((m-PE)) を設計した. これらの新しい折りたたみ形は,安定した曲線形状を採用し,非自然なオリゴーマー設計のための新しい経路を提供します.

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Synthesis of Programmable Main-chain Liquid-crystalline Elastomers Using a Two-stage Thiol-acrylate Reaction
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関連する実験動画

Last Updated: Jul 15, 2026

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09:37

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Published on: October 23, 2015

Synthesis of Programmable Main-chain Liquid-crystalline Elastomers Using a Two-stage Thiol-acrylate Reaction
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Synthesis of Programmable Main-chain Liquid-crystalline Elastomers Using a Two-stage Thiol-acrylate Reaction

Published on: January 19, 2016

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10:10

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科学分野:

  • 超分子化学 超分子化学
  • ポリマーサイエンスの科学
  • 有機化学 オーガニック・ケミストリー

背景:

  • オリゴ ((m-フェニレンエチニレン)) (oligo ((m-PE)) は,溶剤などの外部要因によって誘発される形状に折りたたむことが知られている.
  • オリゴマーの安定した,骨幹から独立した折りたたみ構造を達成することは,依然として課題です.

研究 の 目的:

  • オリゴ ((m-PE) を合成し,分子内水素結合によって硬化された脊椎を持つ特徴づけること.
  • これらの新種のオリゴマーの構造安定性と折り畳み振る舞いを調査する.
  • 回復力のある,折りたたまれた非自然なオリゴーマーを作成するための新しい設計原理を確立する.

主な方法:

  • 2〜7個の残留物を持つオリゴ (m-PE) の合成.
  • 1Dおよび2D (1) H NMRスペクトロスコピーおよびUVスペクトロスコピーを用いた特徴付け.
  • 計算分析は,アビニシオと分子力学の計算を含む.

主要な成果:

  • 分子内水素結合を持つオリゴーマーが成功して合成され,よく定義された曲線形状に折りたたまれることが実証されました.
  • 分子内水素結合と螺旋構造 (ペンタマー,ヘクサマー,ヘプタマー) の持続性が確認されました.
  • バックボーンベースのコンフォメーションプログラミングにより,サイドグループの変異に耐える構造が生まれました.

結論:

  • 分子内水素結合は,安定した折りたたまれたオリゴ (m-PE) 構造を達成するための堅固な方法を提供します.
  • このアプローチは,非自然な折りたたみを作るために,溶媒駆動の折りたたみに対する代替案を提供します.
  • 設計原理により,安定的に折りたたまれた分子を開発し,潜在的な応用が可能になります.