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Structure of Amines01:19

Structure of Amines

2.6K
The hybridized nitrogen atom in amines possesses a lone pair of electrons and is bound to three substituents with a bond angle of around 108°, which is less than the tetrahedral angle of 109.5°. However, the C–N–H bond angle is slightly larger at 112°, with a carbon–nitrogen bond length of 147 pm. This carbon–nitrogen bond length of of amines is longer than the carbon–oxygen bond of alcohols (143 pm) but shorter than alkanes’...
2.6K
Basicity of Aromatic Amines01:18

Basicity of Aromatic Amines

7.3K
The basicity of aromatic amines is much weaker than that of aliphatic amines due to the involvement of the lone pair of electrons over the N atom in resonance with the aryl rings. Generally, the electron-donating ability of any substituents on the aryl ring of aromatic amines increases the basicity of the amine by increasing electron density, and hence the availability of lone pair on the nitrogen. On the other hand, electron-withdrawing functional groups on the aryl ring of amines decrease the...
7.3K
Basicity of Heterocyclic Aromatic Amines01:25

Basicity of Heterocyclic Aromatic Amines

6.2K
Heterocyclic amines, where the N atom is a part of an alicyclic system, are similar in basicity to alkylamines. Interestingly, the heterocyclic amine having a nitrogen atom as part of an aromatic ring has much less basicity than its corresponding alicyclic counterpart. For this reason, as presented in Figure 1, piperidine (pKb = 2.8) is significantly more basic than pyridine (pKb = 8.8).
6.2K
Preparation of Amines: Alkylation of Ammonia and Amines01:30

Preparation of Amines: Alkylation of Ammonia and Amines

3.6K
Alkylation is one of the methods used to prepare amines. Direct alkylation of ammonia or a primary amine with an alkyl halide gives polyalkylated amines along with a quaternary ammonium salt through successive SN2 reactions. This process of making the quaternary salt through the direct alkylation method is called exhaustive alkylation.
Each alkylation step makes the nitrogen center more nucleophilic, which triggers successive alkylations until a quaternary ammonium salt is formed. Considering...
3.6K
Physical Properties of Amines01:26

Physical Properties of Amines

3.3K
Amines with low molecular weight are usually gaseous at room temperature, while those with high molecular weight are liquid or solids in nature. Usually, low molecular weight amines have a rotten fish-like smell. Diamines typically have a pungent smell. For instance, cadaverine and putrescine, depicted in Figure 1, are two molecules responsible for decaying tissue.
3.3K
Basicity of Aliphatic Amines01:21

Basicity of Aliphatic Amines

6.0K
Amines can behave as Brønsted–Lowry bases by accepting a proton from the acid to form corresponding conjugate acids. Due to a lone pair of nonbonding electrons, aliphatic amines can also act as Lewis bases by forming a covalent bond with an electrophile.
To measure the basicity of amines, two conventions are generally used. The first defines Kb as the basicity constant for the deprotonation reaction of water by the amine, as presented in Figure 1. Conventionally, lower Kb indicates...
6.0K

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Updated: Aug 5, 2025

Ethylene Polymerizations Using Parallel Pressure Reactors and a Kinetic Analysis of Chain Transfer Polymerization
07:28

Ethylene Polymerizations Using Parallel Pressure Reactors and a Kinetic Analysis of Chain Transfer Polymerization

Published on: November 27, 2015

13.3K

変数アミン間隔は,ポリディケトエナミンの脱ポリマー化率を決定する.

Alexander R Epstein1, Jeremy Demarteau2, Brett A Helms2,3,4

  • 1Materials Sciences and Engineering, University of California, Berkeley, Berkeley, California 94720, United States.

Journal of the American Chemical Society
|March 28, 2023
PubMed
まとめ
この要約は機械生成です。

ポリディケトエンアミン (PDK) のような循環型ポリマーは 効率的なプラスチックリサイクルを可能にします クロスリンカー内の近接アミンは,PDKの脱ポリメリゼーションを著しく加速し,材料の循環性を高めます.

さらに関連する動画

An Efficient Method for the Synthesis of Peptoids with Mixed Lysine-type/Arginine-type Monomers and Evaluation of Their Anti-leishmanial Activity
12:02

An Efficient Method for the Synthesis of Peptoids with Mixed Lysine-type/Arginine-type Monomers and Evaluation of Their Anti-leishmanial Activity

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Anionic Polymerization of an Amphiphilic Copolymer for Preparation of Block Copolymer Micelles Stabilized by &#960;-&#960; Stacking Interactions
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Anionic Polymerization of an Amphiphilic Copolymer for Preparation of Block Copolymer Micelles Stabilized by π-π Stacking Interactions

Published on: October 10, 2016

14.1K

関連する実験動画

Last Updated: Aug 5, 2025

Ethylene Polymerizations Using Parallel Pressure Reactors and a Kinetic Analysis of Chain Transfer Polymerization
07:28

Ethylene Polymerizations Using Parallel Pressure Reactors and a Kinetic Analysis of Chain Transfer Polymerization

Published on: November 27, 2015

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An Efficient Method for the Synthesis of Peptoids with Mixed Lysine-type/Arginine-type Monomers and Evaluation of Their Anti-leishmanial Activity
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An Efficient Method for the Synthesis of Peptoids with Mixed Lysine-type/Arginine-type Monomers and Evaluation of Their Anti-leishmanial Activity

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Anionic Polymerization of an Amphiphilic Copolymer for Preparation of Block Copolymer Micelles Stabilized by &#960;-&#960; Stacking Interactions
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Anionic Polymerization of an Amphiphilic Copolymer for Preparation of Block Copolymer Micelles Stabilized by π-π Stacking Interactions

Published on: October 10, 2016

14.1K

科学分野:

  • ポリマー化学
  • 材料科学
  • 持続可能な化学

背景:

  • 効率的なリサイクル方法が不足しています 特に耐久性のある製品では
  • 循環型ポリマーは 従来のプラスチックに 持続可能な代替品を提供しています
  • ポリディケトエンアミン (PDK) は,単体回復のための選択的酸触媒脱ポリマー化により有望である.

研究 の 目的:

  • ポリディケトエンアミン (PDK) の脱ポリマー化率に対するクロスリンクラー化学の影響を調査する.
  • PDKの循環性を支配する分子基礎を理解する.
  • PDKの特性と再利用性を高めるために,アミンモノマーの新しい設計戦略を特定する.

主な方法:

  • 異なったクロスリンカー構造を持つポリディケトエナミン (PDK) 変種の合成
  • 反応速度を測定するための酸触媒による脱ポリマー化実験.
  • デポリメリゼーション運動に対するクロスリンカー機能と距離の影響の分析.

主要な成果:

  • クロスリンカーに近隣のアミン群が存在すると,非アミンクロスリンカーと比較してPDKの脱ポリマー化が著しく加速する.
  • アミン群とディケトエナミン結合の間の距離は,脱ポリマー化率を調節する.
  • この発見は,PDKの化学的再利用性を制御する重要な要因を示しています.

結論:

  • 交叉リンク器の設計,特にアミン群の含みと位置付けは,PDKの脱ポリマー化率の調整に不可欠である.
  • この構造と性質の関係を理解することは 次世代の循環型ポリマーの設計に不可欠です
  • この研究は,ポリディケトエナミンの化学的リサイクルと材料の多様性を高めるための分子基盤を提供します.