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関連する概念動画

Ziegler–Natta Chain-Growth Polymerization: Overview01:17

Ziegler–Natta Chain-Growth Polymerization: Overview

3.2K
Ziegler–Natta polymerization is another form of addition or chain‐growth polymerization used for synthesizing linear polymers over branched polymers. The catalyst used for polymerization is the Ziegler–Natta catalyst, named after Karl Ziegler and Giulio Natta, who developed it in 1953. This catalyst is an organometallic complex of titanium tetrachloride and triethyl aluminum, with the active form of the catalyst being an alkyl titanium compound. Using the Ziegler–Natta...
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Radical Chain-Growth Polymerization: Overview01:10

Radical Chain-Growth Polymerization: Overview

2.4K
Chain-growth or addition polymerization is successive addition reactions of monomers with a polymer chain. In radical chain-growth polymerization, the reaction proceeds via a free-radical intermediate. The free radical is formed from radical initiators, which spontaneously generate free radicals by homolytic fission. Organic peroxides (such as dibenzoyl peroxide, as shown in Figure 1) or azo compounds are popular radical initiators. A low concentration ratio of radical initiator to monomer is...
2.4K
Polymer Classification: Architecture01:14

Polymer Classification: Architecture

2.7K
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...
2.7K
Step-Growth Polymerization: Overview01:03

Step-Growth Polymerization: Overview

3.4K
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...
3.4K
Radical Chain-Growth Polymerization: Chain Branching01:17

Radical Chain-Growth Polymerization: Chain Branching

1.9K
The skeletal structure of polymers synthesized via radical polymerization is always branched. For example, the polymerization of ethylene by radical polymerization results in a low-density grade of polyethylene with a heavily branched skeletal structure. Here, the radical site abstracts hydrogen from the growing chain, and the radical site shifts from the end (a primary carbon center) to anywhere within the growing chain (a secondary carbon center). Consequently, the part of the chain from the...
1.9K
Polymers02:34

Polymers

35.6K
The word polymer is derived from the Greek words “poly” which means “many” and “mer” which means “parts”. Polymers are long chains of molecules composed of repeating units of smaller molecules, known as monomers. They either occur naturally, such as DNA and proteins, or can be constructed synthetically, like plastics. They have varied structural characteristics, such as linear chains, branched chains, or complex networks, that contribute to the...
35.6K

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関連する実験動画

Updated: Jun 18, 2025

3D Printing and In Situ Surface Modification via Type I Photoinitiated Reversible Addition-Fragmentation Chain Transfer Polymerization
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3D Printing and In Situ Surface Modification via Type I Photoinitiated Reversible Addition-Fragmentation Chain Transfer Polymerization

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高絡み合いのポリマーネットワークの追加製造

Abhishek P Dhand1, Matthew D Davidson2, Hannah M Zlotnick2

  • 1Department of Bioengineering, University of Pennsylvania, Philadelphia, PA 19104, USA.

Science (New York, N.Y.)
|August 1, 2024
PubMed
まとめ

この研究は,光と暗のポリメリゼーションを使用して,高度に絡み合ったポリマーネットワークを作成するための新しい方法を導入しています. この技術により 3Dプリントされた材料の 硬さや頑丈性が向上し エネルギー吸収能力も向上します

さらに関連する動画

Manufacturing of Three-dimensionally Microstructured Nanocomposites through Microfluidic Infiltration
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Manufacturing of Three-dimensionally Microstructured Nanocomposites through Microfluidic Infiltration

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Self-assembling Morphologies Obtained from Helical Polycarbodiimide Copolymers and Their Triazole Derivatives
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Self-assembling Morphologies Obtained from Helical Polycarbodiimide Copolymers and Their Triazole Derivatives

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関連する実験動画

Last Updated: Jun 18, 2025

3D Printing and In Situ Surface Modification via Type I Photoinitiated Reversible Addition-Fragmentation Chain Transfer Polymerization
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3D Printing and In Situ Surface Modification via Type I Photoinitiated Reversible Addition-Fragmentation Chain Transfer Polymerization

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Manufacturing of Three-dimensionally Microstructured Nanocomposites through Microfluidic Infiltration
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Manufacturing of Three-dimensionally Microstructured Nanocomposites through Microfluidic Infiltration

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Self-assembling Morphologies Obtained from Helical Polycarbodiimide Copolymers and Their Triazole Derivatives
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科学分野:

  • 材料科学
  • ポリマー化学
  • アディティブ製造

背景:

  • 密度の高いポリマー鎖の絡み合いは 材料の硬さと強さを高めます
  • バット光ポリメリゼーション添加物製造 (例えば,デジタル光処理) で高絡み密度を達成することは困難です.
  • 現在の方法では 印刷後に熱や光にさらされるような刺激が必要になります

研究 の 目的:

  • 添加物製造過程で高度に絡み合ったポリマーネットワークを作成するための簡単な戦略を開発する.
  • 機械性能が向上したハイドロゲルやエラストマーの製造を可能にします.
  • 高解像度,マルチ素材の3Dプリントの汎用的なアプローチを示します.

主な方法:

  • 印刷過程で光と暗のポリメリゼーションを組み合わせた新しいアプローチです.
  • 室温でVat光ポリメリゼーション添加物製造 (例えば,デジタル光処理)
  • モノマー変換,絡み合いの密度,および機械的特性 (拡張エネルギー) の特徴.

主要な成果:

  • 印刷後の刺激なしに室温で高いモノマー変換を達成した.
  • 伝統的なデジタル光処理と比較して4倍から7倍の拡張エネルギーを持つ高度に絡み合った水素と弾性物質を製造した.
  • 湿った組織に プログラムされた粘着のような特徴を持つ 高解像度の多素材構造を 印刷しました

結論:

  • 開発されたライトとダークのポリメリゼーション戦略は,添加物製造中に密集したポリマーネットワークを効果的に作成します.
  • この方法は,3Dプリントされた材料の機械性能 (硬さ,タフさ,エネルギー吸収) を大幅に改善します.
  • このアプローチは,生物医学機器を含む様々な用途のための高度な機能的材料と複雑な構造を生産するために一般化できます.