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関連する概念動画

Step-Growth Polymerization: Overview01:03

Step-Growth Polymerization: Overview

3.5K
Step-growth or condensation polymerization is a stepwise reaction of bi or multifunctional monomers to form long-chain polymers. As all the monomers are reactive, most of the monomers are consumed at the early stages of the reaction to form small chains of reactive oligomers, which then combine to form long polymer chains in the late stages. Hence, the reaction has to proceed for a long time to achieve high molecular weight polymers.
Many natural and synthetic polymers are produced by...
3.5K
Molecular Weight of Step-Growth Polymers01:08

Molecular Weight of Step-Growth Polymers

2.2K
Step growth polymerization involves bi or multifunctional monomers. Bifunctional monomers react to form linear step growth polymers, whereas multifunctional monomers react to form non-linear or branched polymers.
As the step-growth polymerization involves step-wise condensation of monomers, the molecular weight also builds up eventually. Consequently, high molecular weight polymers are obtained at the late stages of the polymerization, where 99% of monomers have been consumed.
The extent of the...
2.2K
Types of Step-Growth Polymers: Polyesters01:20

Types of Step-Growth Polymers: Polyesters

2.3K
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...
2.3K
Plastic Behavior01:21

Plastic Behavior

219
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...
219
Polymer Classification: Crystallinity01:21

Polymer Classification: Crystallinity

2.9K
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...
2.9K
Anionic Chain-Growth Polymerization: Overview01:20

Anionic Chain-Growth Polymerization: Overview

2.1K
The polymerization process that involves carbanion as an intermediate is called anionic polymerization. It is also a type of addition or chain-growth polymerization. Anionic polymerization gets initiated by a strong nucleophile such as an organolithium or a Grignard reagent. The most commonly used initiator for anionic polymerization is butyl lithium. Monomers involved in anionic polymerization must possess a vinyl group bonded to one or two electron-withdrawing groups. For instance,...
2.1K

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関連する実験動画

Updated: Jul 16, 2025

Fabrication of a Bioactive, PCL-based "Self-fitting" Shape Memory Polymer Scaffold
09:37

Fabrication of a Bioactive, PCL-based "Self-fitting" Shape Memory Polymer Scaffold

Published on: October 23, 2015

12.7K

形状メモリポリマー プログラム可能な回復開始

Chujun Ni1, Di Chen2, Yu Yin3

  • 1State Key Laboratory of Chemical Engineering, College of Chemical and Biological Engineering, Zhejiang University, Hangzhou, China.

Nature
|September 13, 2023
PubMed
まとめ
この要約は機械生成です。

この研究は 体の自然な温度に反応する 新しい形状変化ヒドロゲルを導入します 形状回復のためのプログラム可能な遅延を提供し,医療機器のための現在の形状変化ポリマーの制限を克服します.

さらに関連する動画

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

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Shape Memory Polymers for Active Cell Culture
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Shape Memory Polymers for Active Cell Culture

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関連する実験動画

Last Updated: Jul 16, 2025

Fabrication of a Bioactive, PCL-based "Self-fitting" Shape Memory Polymer Scaffold
09:37

Fabrication of a Bioactive, PCL-based "Self-fitting" Shape Memory Polymer Scaffold

Published on: October 23, 2015

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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

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Shape Memory Polymers for Active Cell Culture
10:53

Shape Memory Polymers for Active Cell Culture

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科学分野:

  • 材料科学
  • ポリマー化学
  • 生物医学工学

背景:

  • 刺激に反応する形状変化ポリマーは ソフトロボティクスや医療機器などの 先進的な応用に不可欠です
  • 外部トリガー (熱,光) により形状が変化するポリマーは,現実のシナリオでは特にインプラント可能なデバイスでは大きな課題を提示します.
  • 現存するポリマーには 外部トリガーが必要で 自然な刺激を用いて 回復の開始を制御できない.

研究 の 目的:

  • 自然に誘発されながら 積極的に制御できる 形状変化ポリマーを開発する
  • 形状記憶ポリマーの自然なトリガーと制御可能な回復の相反する属性を克服するために.
  • 先進的なデバイスアプリケーションの実装の障壁を軽減する素材を作成します.

主な方法:

  • 段階分離を用いた4次元プリント可能な形状メモリヒドロゲルを開発した.
  • 従来のポリマーにおける熱伝送とは異なる内部質量拡散が支配する形状変化運動を調査した.
  • 装置のプログラム中に相分離の度合いを制御することによって,プログラム可能な回復開始遅延を設計した.

主要な成果:

  • 液体ゲルは自然環境温度で形状の変化を示します.
  • 段階分離の程度によって制御される,回復の開始における重要なプログラム可能な遅延が達成されました.
  • 運動は内部質量拡散によって制御され 新しい制御メカニズムが提供されます

結論:

  • この自然に誘発された形状記憶ポリマーは 調節可能な回復開始により実装の障壁を大幅に低減します
  • この材料は,要求に応じた形状変化制御のためのユニークなソリューションを提供します.
  • 段階分離と内部質量拡散は,高度な形状変化材料を設計するための新しい経路を提供します.