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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
Polymers02:34

Polymers

35.7K
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...
35.7K
Characteristics and Nomenclature of Copolymers01:24

Characteristics and Nomenclature of Copolymers

2.5K
Copolymers are the products obtained from the polymerization of multiple monomer species. So, in a polymer chain itself, there can be multiple repeating units that come from different monomers. The process of synthesizing a polymer from different monomer species is called copolymerization. When two monomers are involved, the polymer is known as a bipolymer. Polymers with three and four monomers are termed terpolymers and quaterpolymers, respectively. Figure 1 depicts the copolymerization of...
2.5K
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
Olefin Metathesis Polymerization: Overview01:13

Olefin Metathesis Polymerization: Overview

2.1K
Recently, the development of olefin metathesis polymerization advanced the field of polymer synthesis. Simply put, the reorganization of substituents on their double bonds between two olefins in the presence of a catalyst is known as the olefin metathesis reaction. The use of metathesis reaction for polymer synthesis is called olefin metathesis polymerization.
Ruthenium-based Grubbs catalyst is the most commonly used catalyst for olefin metathesis polymerization. Grubbs catalyst consists...
2.1K
Radical Chain-Growth Polymerization: Mechanism01:09

Radical Chain-Growth Polymerization: Mechanism

2.5K
The radical chain-growth polymerization mechanism consists of three steps: initiation, propagation, and termination of polymerization. The polymerization initiates when a free radical generated from the radical initiator adds to the unsaturated bond in the monomer. The unpaired electron of the free radical and one π electron in the unsaturated bond creates a σ bond between the free radical and the monomer. As a result, the other π electron in the unsaturated bond converts this...
2.5K

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関連する実験動画

Updated: Jul 2, 2025

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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ランダムヘテロポリマーの合成,浄化,脱ポリマー化による組成の進化のマッピング

Hao Yu1, Luofu Liu2, Ruilin Yin3

  • 1California Institute for Quantitative Biosciences, University of California, Berkeley, Berkeley, California 94720, United States.

Journal of the American Chemical Society
|February 22, 2024
PubMed
まとめ

ランダムヘテロポリマー (RHP) を用いた機能材料の設計は,モノメアの組成を正確にマッピングすることによって進みます. この研究は,信頼性の高いRHP設計のために,シミュレートされた配列が実験結果と密接に一致することを保証します.

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Polymer Microarrays for High Throughput Discovery of Biomaterials
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Polymer Microarrays for High Throughput Discovery of Biomaterials

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Fabricating Degradable Thermoresponsive Hydrogels on Multiple Length Scales via Reactive Extrusion, Microfluidics, Self-assembly, and Electrospinning
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Fabricating Degradable Thermoresponsive Hydrogels on Multiple Length Scales via Reactive Extrusion, Microfluidics, Self-assembly, and Electrospinning

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関連する実験動画

Last Updated: Jul 2, 2025

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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Polymer Microarrays for High Throughput Discovery of Biomaterials
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Polymer Microarrays for High Throughput Discovery of Biomaterials

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Fabricating Degradable Thermoresponsive Hydrogels on Multiple Length Scales via Reactive Extrusion, Microfluidics, Self-assembly, and Electrospinning
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Fabricating Degradable Thermoresponsive Hydrogels on Multiple Length Scales via Reactive Extrusion, Microfluidics, Self-assembly, and Electrospinning

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科学分野:

  • ポリマー化学
  • 材料科学
  • コンピュータ化学

背景:

  • 多数のコモノマーを持つランダムヘテロポリマー (RHP) は,機能的な材料にとって極めて重要です.
  • モノメアの多様性が増加すると,配列空間が広がり,異質性が生じる.
  • 現在のRHP設計は構成とシミュレーションに依存し,配列の異質性と実験的相関に関する理解は限られている.

研究 の 目的:

  • 設計-合成-浄化-脱ポリメリゼーションの完全なサイクルを通して,4つのモノマーRHPのモノマー組成の進化を定量的にマッピングする.
  • シリコ分析で,シミュレートされたRHP組成物を実験結果と比較して検証する.
  • 計算的方法を用いて様々な溶媒におけるRHPコンファメーション分布を調査する.

主な方法:

  • 四次メタクリレートRAFT共聚化実験が行われました.
  • 12の反応率を決定するために,ジャークス法が用いられました.
  • 自己一貫性フィールド理論 (SCFT) による高通量計算がコンファメーション分析に使用された.

主要な成果:

  • 競争性のあるモノマー添加と可逆的な均衡を考慮して,反応率を決定した.
  • シリコ分析では,実験RHP組成物との量的な一致 (<4%の差) が示された.
  • コンフォーメーション分布は,モノマー化学,組成,溶媒特性の関数としてマッピングされた.

結論:

  • 信頼性の高いRHP設計には,反応率の正確な決定が不可欠である.
  • モノメアの組成は,機能的なRHPの設計に適したパラメータです.
  • RHP合成の活性を確保することは,成功する材料設計に不可欠です.