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関連する概念動画

Superplasticizers01:30

Superplasticizers

109
Superplasticizers are advanced admixtures that enhance the workability of concrete by lowering the water content without compromising the strength of the material. These substances are highly effective water reducers, improving concrete flow, making it easier to work with, and enabling concrete to reach inaccessible areas or densely reinforced sections without mechanical vibration. The key components in superplasticizers are either sulfonated melamine or naphthalene formaldehyde condensates,...
109
Plasticizers01:31

Plasticizers

96
Water-reducers, or plasticizers, are chemical admixtures used in concrete to improve strength and workability. These additives reduce the water-cement ratio without compromising workability, lower the cement content while maintaining the same workability, or increase workability to assist concrete placement in inaccessible areas.
Plasticizers function by using surface-active agents to create repulsive electrostatic forces between cement particles. This dispersion enhances the concrete's...
96
Olefin Metathesis Polymerization: Acyclic Diene Metathesis (ADMET)00:53

Olefin Metathesis Polymerization: Acyclic Diene Metathesis (ADMET)

2.0K
Acyclic diene metathesis polymerization or ADMET polymerization involves cross-metathesis of terminal dienes, such as 1,8-nonadiene, to give linear unsaturated polymer and ethylene. As ADMET is a reversible process, the formed ethylene gas must be removed from the reaction mixture to complete the polymerization process.
Similar to cross-metathesis, ADMET also involves the formation of metallacyclobutane intermediate by [2+2] cycloaddition of one of the double bonds of a terminal diene with...
2.0K
Polymer Classification: Stereospecificity01:26

Polymer Classification: Stereospecificity

2.5K
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...
2.5K
Polymer Classification: Architecture01:14

Polymer Classification: Architecture

2.8K
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...
2.8K
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

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関連する実験動画

Updated: Aug 1, 2025

The Preparation and Properties of Thermo-reversibly Cross-linked Rubber Via Diels-Alder Chemistry
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The Preparation and Properties of Thermo-reversibly Cross-linked Rubber Via Diels-Alder Chemistry

Published on: August 25, 2016

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ダイナミック・クロスリンクは,混じり合わない混合プラスチックを相容らせます.

Ryan W Clarke1, Tobias Sandmeier2, Kevin A Franklin1

  • 1Department of Chemistry, Colorado State University, Fort Collins, CO, USA.

Nature
|April 26, 2023
PubMed
まとめ

この研究は,混合プラスチックのための新しい互換性戦略を導入し,強化された特性を持つ再利用可能なダイナミック・サーモセットを作成します. この革新的なアプローチにより プラスチックの廃棄物から 価値ある材料とエネルギーを回収できます

さらに関連する動画

Depolymerizable Olefinic Polymers Based on Fused-Ring Cyclooctene Monomers
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Depolymerizable Olefinic Polymers Based on Fused-Ring Cyclooctene Monomers

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The Effect of Construction and Demolition Waste Plastic Fractions on Wood-Polymer Composite Properties
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The Effect of Construction and Demolition Waste Plastic Fractions on Wood-Polymer Composite Properties

Published on: June 7, 2020

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関連する実験動画

Last Updated: Aug 1, 2025

The Preparation and Properties of Thermo-reversibly Cross-linked Rubber Via Diels-Alder Chemistry
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The Preparation and Properties of Thermo-reversibly Cross-linked Rubber Via Diels-Alder Chemistry

Published on: August 25, 2016

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Depolymerizable Olefinic Polymers Based on Fused-Ring Cyclooctene Monomers
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The Effect of Construction and Demolition Waste Plastic Fractions on Wood-Polymer Composite Properties
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科学分野:

  • 材料科学
  • ポリマー化学
  • 持続可能な工学

背景:

  • 世界的なプラスチック問題は 環境,エネルギー,気候に重大な影響を及ぼしています
  • 混合プラスチック廃棄物の,特に極性/非極性ポリマー混合物の 効果的な閉環リサイクルは,相違性や相分離により,依然として大きな課題です.
  • 現在の戦略は 低品質な材料を生み出し 循環経済を阻害しています

研究 の 目的:

  • 混合不可能なポリマー混合物,特に混合プラスチック廃棄物を適合させるための新しい戦略を開発する.
  • 不均一なプラスチック流の現在のリサイクル方法の限界を克服する.
  • 混合プラスチックから付加価値のある材料を作り,性能と再処理性を向上させる.

主な方法:

  • ダイナミッククロスリンクを混ぜないポリマー混合物 (バイナリ,トリナリ,消費後の混合物) にインサイトで設置する.
  • 実験と計算モデル研究を組み合わせる
  • ダイナミッククロスリンカーとポリマー鎖の反応を研究し,多重ブロック共ポリマーを形成する.

主要な成果:

  • ダイナミッククロスリンクを使用した新しい互換化戦略が成功裏に開発されました.
  • 多重ブロック共ポリマーのインシット形成は,極性および非極性ポリマー混合物を効果的に相容らせました.
  • 結果として生じたダイナミック・サーモセットは,未使用のプラスチックと比較して,本質的な再処理性,強化された伸縮強度,および強化された爬行抵抗性を示した.

結論:

  • 開発された戦略は,相分離問題を克服し,混合プラスチックを互換化するための簡単な経路を提供します.
  • ダイナミック・サーモセットは,プラスチック廃棄物から素材とエネルギーを回収するための持続可能な代替手段です.
  • このアプローチは複雑な分解プロセスを回避し,高度なプラスチックのリサイクルとアップサイクルの道を開きます.