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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

3.4K
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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Polymers02:34

Polymers

21.0K
21.0K
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...
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Catenins01:23

Catenins

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Catenins are characterized by multiple binding domains and dynamic structures that allow them to function as linker proteins in cell junction complexes. All catenins, except α-catenin, contain a characteristic protein sequence called the armadillo repeat and are therefore also called armadillo proteins.
Catenins in Cell Junctions
Catenins bind to cell adhesion molecules such as cadherins and link them to different cytoskeletal proteins depending on the type of cell junction. At the...
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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
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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Self-assembling Morphologies Obtained from Helical Polycarbodiimide Copolymers and Their Triazole Derivatives
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ダブルスライドリングポリキャテナンの網

Laura F Hart1, William R Lenart1, Jerald E Hertzog1,2

  • 1Pritzker School of Molecular Engineering, University of Chicago, Chicago, Illinois 60637, United States.

Journal of the American Chemical Society
|May 25, 2023
PubMed
まとめ
この要約は機械生成です。

スライドリングポリキャテナンのネットワークのような 移動式クロスリンクを備えた 機械的に相互接続されたポリマーは 強化された頑丈性を提供します これらのネットワークから金属イオンを取り除くことで 鎖の移動性が解消され 弾性排水が改善されます

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Depolymerizable Olefinic Polymers Based on Fused-Ring Cyclooctene Monomers
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Synthesis of Cyclic Polymers and Characterization of Their Diffusive Motion in the Melt State at the Single Molecule Level
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Self-assembling Morphologies Obtained from Helical Polycarbodiimide Copolymers and Their Triazole Derivatives
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Synthesis of Cyclic Polymers and Characterization of Their Diffusive Motion in the Melt State at the Single Molecule Level
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科学分野:

  • ポリマー化学
  • 材料科学
  • 超分子化学

背景:

  • ポリマーネットワークにおける共性クロスリンクは,構造的不均一性による脆さにつながることが多い.
  • スライドリングネットワーク (SRN) やポリキャテナンネットワーク (PCN) などの移動式クロスリンクを備えた機械的に相互接続されたポリマー (MIP) は,より高い耐久性と強さを提供します.
  • スライドリングポリキャテナンネットワーク (SR-PCN) は,SRNとPCNの特徴を組み合わせ,スライドリング連鎖を通してダイナミックなクロスリンクを可能にします.

研究 の 目的:

  • 金属イオンテンプレート型の偽[3]ロタキサン (P3R) クロスリンカーを使用してスライドリングポリキャテナンネットワーク (SR-PCN) を合成および調査する.
  • P3Rとコバルントクロスリンクの比率を変化させることで,ネットワークの特性への影響を調べる.
  • 横断リンクの移動性を制御する金属イオンの役割とその機械的行動への影響を理解する.

主な方法:

  • 触媒のないニトリル酸化物/アルキンのサイクル添加ポリメリゼーションを用いたSR-PCNの合成.
  • 金属イオンテンプレートによる二重スレッドの擬似[3]ロタキサン (P3R) を,共性クロスリンカーと共に移動クロスリンカーとして組み込む.
  • 合成されたSR-PCNの機械特性試験,金属イオン除去前後の試験を含む.

主要な成果:

  • 金属イオンは,偽[3]ロタキサン環を効果的に"ロック"し,従来の共性ポリエチレングリコール (PEG) ゲルに似た機械的性質をもたらした.
  • 金属イオンの除去により 鎖状のリングの動きが解き放たれ 高周波の機械的移行が起こりました
  • 金属イオンのないSR-PCNのダイナミッククロスリンクは,より長い時間スケールでポリマー鎖のリラックスとポロ弾性排出を加速した.

結論:

  • SR-PCNは,堅牢でダイナミックなポリマーネットワークを作成するための調整可能なプラットフォームを提供します.
  • メタルイオンテンプレートは,クロスリンクの移動性と材料特性を制御するための可逆的な方法を提供します.
  • ロック解除されたSR-PCNのダイナミックな性質は,機械的な応答と流体輸送特性を改善します.