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関連する概念動画

Characteristics and Nomenclature of Copolymers01:24

Characteristics and Nomenclature of Copolymers

2.6K
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...
2.6K
Polymers02:34

Polymers

35.8K
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...
35.8K
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
Dehydration Synthesis01:15

Dehydration Synthesis

133.5K
Overview
Dehydration synthesis (also called a condensation reaction) is the chemical process in which two molecules covalently link together to form a new molecule, along with the release of a water molecule. Many physiologically important compounds form by dehydration synthesis reactions, such as complex carbohydrates, proteins, DNA, and RNA.
Synthesis of carbohydrates
Sugar molecules are covalently linked together by dehydration synthesis. During the reaction, the hydroxyl (-OH) group from...
133.5K
Characteristics and Nomenclature of Homopolymers01:00

Characteristics and Nomenclature of Homopolymers

3.1K
Polymers that are made up of identical monomer units are called homopolymers. Only one repeating unit is involved in the construction of the homopolymer structure. For example, as depicted in Figure 1, polypropylene is a homopolymer constituted of propylene monomers. Here, the only repeating unit in the polymer chain is propylene.
3.1K
ATP and Macromolecule Synthesis01:28

ATP and Macromolecule Synthesis

5.6K
Biological macromolecules are organic compounds, predominantly composed of carbon atoms. The carbon atoms are covalently bonded with hydrogen, oxygen, nitrogen, and other minor elements. There are four major biological macromolecule classes: carbohydrates, lipids, proteins, and nucleic acids.
Most macromolecules are composed of single subunits, or building blocks, called monomers. The monomers combine with each other using covalent bonds to form larger molecules known as polymers.
Conversion of...
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Updated: Jul 15, 2025

Using Polystyrene-block-polyacrylic acid-coated Metal Nanoparticles as Monomers for Their Homo- and Co-polymerization
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Using Polystyrene-block-polyacrylic acid-coated Metal Nanoparticles as Monomers for Their Homo- and Co-polymerization

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単一のモノマーから2つの構造的に異なるポリマー

Javed R Pathan1, Subhrajyoti Bhandary1, Kana M Sureshan1

  • 1School of Chemistry, Indian Institute of Science Education and Research Thiruvananthapuram, Vithura, Thiruvananthapuram 695551, India.

Journal of the American Chemical Society
|October 3, 2023
PubMed
まとめ
この要約は機械生成です。

研究者は,トポケミカルポリメリゼーションのための新しいマロナミドモノマーを合成し,アジド-アルキンサイクロアディションによって異なる構造とトポロジーを持つ2つの異なるナイロンのようなポリマーを生成しました. この画期的な研究は ポリマーの構造を 精密に制御することを可能にします

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Synthesis of Monodisperse Cylindrical Nanoparticles via Crystallization-driven Self-assembly of Biodegradable Block Copolymers
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Depolymerizable Olefinic Polymers Based on Fused-Ring Cyclooctene Monomers
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Synthesis of Monodisperse Cylindrical Nanoparticles via Crystallization-driven Self-assembly of Biodegradable Block Copolymers
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Depolymerizable Olefinic Polymers Based on Fused-Ring Cyclooctene Monomers
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科学分野:

  • ポリマー化学
  • 材料科学
  • クリスタルグラフィー

背景:

  • トポケミカルポリメリゼーションは,制御された構造を持つ結晶型ポリマーへの経路を提供します.
  • アジド-アルキンサイクロアディションは,ポリマー合成のための多用途のクリック化学反応である.

研究 の 目的:

  • トポケミカルポリメリゼーションのためのマロナミド由来モノマーを設計し合成する.
  • 単一のモノマーから2つの異なるポリマー構造の形成を調査する.
  • ポリメリゼーションプロセスと結果のポリマートポロジの原子レベルの詳細を解明する.

主な方法:

  • アジドとアルキンの機能性を有するマロナミド単体合成.
  • 2つのポリモルフ (M1とM2) を得るために結晶化.
  • 単結晶X線 difraktionで結晶構造とポリメリゼーション経路を分析する.
  • トポケミカルポリメリゼーションを誘導する熱分析.

主要な成果:

  • モノメアの2つの同時多形態 (M1とM2) が得られた.
  • 両ポリモルフは,トポケミカルなアジド-アルキンサイクル添加ポリメリゼーションを受けた.
  • ポリモルフM1は1,4-非置換型トリアゾリル結合ポリマーを生成し,ポリメリゼーションは水素結合に垂直であった.
  • ポリモルフM2は,水素結合に沿ったポリメリゼーションで,1,5異置換のトリアゾリル結合ポリマーを生成した.
  • 異なるトポロジーを持つ2つの構造的同位体ポリマーが,単結晶から単結晶の変換によって合成された.

結論:

  • この研究は,単一のモノマーから2つの構造的に同位体ポリマーを初めてトポケミカル合成したと報告しています.
  • 結晶包装は,生成されたポリマーの地域化学とトポロジーを決定する.
  • 単結晶から単結晶へのポリメリゼーションは,ポリマー形成に関する原子解像度の洞察を提供します.