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関連する概念動画

Polymers: Molecular Weight Distribution01:10

Polymers: Molecular Weight Distribution

For any given polymer, the weight average molecular weight (Mw) is higher than, if not equal to, the number average molecular weight (Mn). The only situation in which the weight average molecular weight and the number average molecular weight are equal is when a polymer consists only of chains with equal molecular weight. However, this never happens in a synthetic polymer, since it is difficult to control the polymerization process up to a molecular level with accuracy to a hundred percent.
Polymer Classification: Architecture01:14

Polymer Classification: Architecture

Polymers are classified as linear or branched on the basis of their chain architecture. The polymer chains in linear polymers have a long chain-like structure with minimal to no branching at all. Even if a polymer features large substituent groups on the monomer, which appear as branches to the skeleton, it is not considered a branched polymer. A branched polymer contains secondary polymer chains that arise from the main polymer chain. The branching occurs when the polymer growth shifts from...
Polymer Classification: Crystallinity01:21

Polymer Classification: Crystallinity

Unlike ionic or small covalent molecules, polymers do not form crystalline solids due to the diffusion limitations of their long-chain structures. However, polymers contain microscopic crystalline domains separated by amorphous domains.
Crystalline domains are the regions where polymer chains are aligned in an orderly manner and held together in proximity by intermolecular forces. For example, chains in the crystalline domains of polyethylene and nylon are bound together by van der Waals...
Polymer Classification: Stereospecificity01:26

Polymer Classification: Stereospecificity

Polymerization generates chiral centers along the entire backbone of a polymer chain. Accordingly, the stereochemistry of the substituent group has a significant effect on polymer properties. Polymers formed from monosubstituted alkene monomers feature chiral carbons at every alternate position in the polymer backbone. Relative to the predominant orientation of substituents at the adjacent chiral carbons, the polymer can exist in three different configurations: isotactic, syndiotactic, and...
Plastic Behavior01:21

Plastic Behavior

A material's elastic behavior is characterized by the disappearance of stress once the load is removed, allowing the material to return to its original state. However, when stress surpasses the yield point, yielding commences, marking the onset of plastic deformation or permanent set. This change from elastic to plastic behavior is influenced by the peak stress value and the duration before the load is removed. An intriguing observation occurs when a specimen is loaded, unloaded, and reloaded.
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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関連する実験動画

Updated: Jul 16, 2026

Extraction of Organochlorine Pesticides from Plastic Pellets and Plastic Type Analysis
10:12

Extraction of Organochlorine Pesticides from Plastic Pellets and Plastic Type Analysis

Published on: July 1, 2017

熱塑性エラストモアの分子認識

Rolf A Koevoets1, Ron M Versteegen, Huub Kooijman

  • 1Laboratory of Macromolecular and Organic Chemistry, Eindhoven University of Technology, P.O. Box 513, 5600 MB Eindhoven, The Netherlands.

Journal of the American Chemical Society
|March 3, 2005
PubMed
まとめ

熱可塑性弾性体へのビスウレアゲストの選択的組み込みは,マッチングの尿素群距離に依存します. この精密な分子マッチングは,材料の機械的性質と染料の振る舞いを大幅に変化させます.

科学分野:

  • ポリマーサイエンスの科学
  • マテリアルサイエンス 材料科学
  • 超分子化学 超分子化学

背景:

  • 熱可塑性弾性体 (TPE) は,調整可能な機械特性を持つ多用途な材料です.
  • ビスウレア機能群は強い水素結合を形成し,ポリマーの自己組み立てと性質に影響を与える.
  • ポリマーマトリックスにゲスト分子の組み込みを制御することは,高度な材料設計において極めて重要です.

研究 の 目的:

  • TPEにビスウエリアゲストの選択的組み込みを調査する.
  • 尿素のグループ間隔がゲスト-ホストの相互作用と材料の性質にどのように影響するかを理解する.
  • 染料の振る舞いと機械性能に対する選択的組み込みの影響を調査する.

主な方法:

  • ポリ (テトラヒドロフラン) 軟塊とビスウレア硬塊による熱塑性弾性体合成.
  • ビスウレア機能化されたゲストの調理には,メチレン単位間隔が異なる.
  • 洗剤溶液による抽出性試験を用いたゲストの組み込みの分析.
  • 延伸を含む機械的な試験で,材料の性質と染料の調整性を評価する.

主要な成果:

  • ビスウレアゲストの選択的組み込みは,宿主とゲストの尿素群の距離が一致した場合にのみ観察されました.

さらに関連する動画

Characterization of Synthetic Polymers via Matrix Assisted Laser Desorption Ionization Time of Flight (MALDI-TOF) Mass Spectrometry
06:56

Characterization of Synthetic Polymers via Matrix Assisted Laser Desorption Ionization Time of Flight (MALDI-TOF) Mass Spectrometry

Published on: June 10, 2018

Disentangling High Strength Copolymer Aramid Fibers to Enable the Determination of Their Mechanical Properties
06:02

Disentangling High Strength Copolymer Aramid Fibers to Enable the Determination of Their Mechanical Properties

Published on: September 1, 2018

関連する実験動画

Last Updated: Jul 16, 2026

Extraction of Organochlorine Pesticides from Plastic Pellets and Plastic Type Analysis
10:12

Extraction of Organochlorine Pesticides from Plastic Pellets and Plastic Type Analysis

Published on: July 1, 2017

Characterization of Synthetic Polymers via Matrix Assisted Laser Desorption Ionization Time of Flight (MALDI-TOF) Mass Spectrometry
06:56

Characterization of Synthetic Polymers via Matrix Assisted Laser Desorption Ionization Time of Flight (MALDI-TOF) Mass Spectrometry

Published on: June 10, 2018

Disentangling High Strength Copolymer Aramid Fibers to Enable the Determination of Their Mechanical Properties
06:02

Disentangling High Strength Copolymer Aramid Fibers to Enable the Determination of Their Mechanical Properties

Published on: September 1, 2018

  • 組み込みは,熱塑性弾性体の機械的性質を著しく調節しました.
  • ビスウレア機能化された染料は,精密な尿素間隔に基づいて明確な抽出性を示した.
  • エラストマーフィルムの延長により,マッチング染料と非マッチング染料の調整能力の違いが明らかになった.

    • 結論:

    • 精密にマッチングした尿素のグループ間隔は,ビスウレアベースのTPEに選択的にゲストを組み込むために重要です.
    • この分子レベルの制御は,材料の特性を調節するための強力な戦略を提供します.
    • ビスウレア機能化された染料は,分子相互作用と弾性体マトリックス内の配列のための敏感な探査機として機能します.