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Polymer Classification: Crystallinity01:21

Polymer Classification: Crystallinity

3.0K
Unlike ionic or small covalent molecules, polymers do not form crystalline solids due to the diffusion limitations of their long-chain structures. However, polymers contain microscopic crystalline domains separated by amorphous domains.
Crystalline domains are the regions where polymer chains are aligned in an orderly manner and held together in proximity by intermolecular forces. For example, chains in the crystalline domains of polyethylene and nylon are bound together by van der Waals...
3.0K
Anionic Chain-Growth Polymerization: Overview01:20

Anionic Chain-Growth Polymerization: Overview

2.2K
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,...
2.2K
Cationic Chain-Growth Polymerization: Mechanism00:57

Cationic Chain-Growth Polymerization: Mechanism

2.4K
The cationic polymerization mechanism consists of three steps: initiation, propagation, and termination. In the initiation step of the polymerization process, the π bond of a monomer gets protonated by the Lewis acid catalyst, which is formed from boron trifluoride and water. The protonation of the π bond generates a carbocation stabilized by the electron‐donating group. In the propagation step, the π bond of the second monomer acts as a nucleophile and attacks the...
2.4K
Polymers: Molecular Weight Distribution01:10

Polymers: Molecular Weight Distribution

3.7K
For any given polymer, the weight average molecular weight (Mw) is higher than, if not equal to, the number average molecular weight (Mn). The only situation in which the weight average molecular weight and the number average molecular weight are equal is when a polymer consists only of chains with equal molecular weight. However, this never happens in a synthetic polymer, since it is difficult to control the polymerization process up to a molecular level with accuracy to a hundred percent.
3.7K
Anionic Chain-Growth Polymerization: Mechanism01:04

Anionic Chain-Growth Polymerization: Mechanism

2.1K
The mechanism for anionic chain-growth polymerization involves initiation, propagation, and termination steps. In the initiation step, a nucleophilic anion, such as butyl lithium, initiates the polymerization process by attacking the π bond of the vinylic monomer. As a result, a carbanion, stabilized by the electron‐withdrawing group, is generated. The resulting carbanion acts as a Michael donor in the propagation step and attacks the second vinylic monomer, which acts as a Michael...
2.1K
Radical Chain-Growth Polymerization: Overview01:10

Radical Chain-Growth Polymerization: Overview

2.5K
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...
2.5K

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関連する実験動画

Updated: Aug 31, 2025

Synthesis of Monodisperse Cylindrical Nanoparticles via Crystallization-driven Self-assembly of Biodegradable Block Copolymers
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Synthesis of Monodisperse Cylindrical Nanoparticles via Crystallization-driven Self-assembly of Biodegradable Block Copolymers

Published on: June 20, 2019

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結晶型1Dダイナミック共性ポリマー

Elisabet De Bolòs1, Marta Martínez-Abadía1, Félix Hernández-Culebras1

  • 1POLYMAT, University of the Basque Country UPV/EHU, Avenida de Tolosa 72, Donostia-San Sebastián 20018, Spain.

Journal of the American Chemical Society
|August 22, 2022
PubMed
まとめ
この要約は機械生成です。

研究者はダイナミック・コバルント化学を用いて 結晶型一次元ポリマーを合成した. この突破はポリマーの性質をよりよく理解し,充電輸送能力の強化された材料を生み出します.

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Synthesis of Information-bearing Peptoids and their Sequence-directed Dynamic Covalent Self-assembly
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Self-assembling Morphologies Obtained from Helical Polycarbodiimide Copolymers and Their Triazole Derivatives
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Last Updated: Aug 31, 2025

Synthesis of Monodisperse Cylindrical Nanoparticles via Crystallization-driven Self-assembly of Biodegradable Block Copolymers
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Synthesis of Information-bearing Peptoids and their Sequence-directed Dynamic Covalent Self-assembly
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Self-assembling Morphologies Obtained from Helical Polycarbodiimide Copolymers and Their Triazole Derivatives
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科学分野:

  • ポリマー化学
  • 材料科学
  • 固体物理学

背景:

  • 結晶型一次元ポリマーは,材料の構造と性質の関係を理解するために不可欠です.
  • 無形または半結晶相への傾向のために,結晶の1次元のポリマーを達成することは困難です.
  • これらの材料は,熱的,機械的,導電性の特性を強化する可能性を秘めています.

研究 の 目的:

  • 溶液中の結晶型一次元ポリマーの合成を報告する.
  • 構造と資産の関係,特に運送料を調査する.
  • オーダーされたポリメアの材料を作る方法を示します.

主な方法:

  • ポリマー合成のためのダイナミック・コバルント化学
  • 構造確認のためのマイクロクリスタル電子 difraktion.
  • 運送料に関する研究と理論的計算

主要な成果:

  • 溶液で結晶型一次元ポリマーを 合成しました
  • マイクロクリスタル電子 difraktionを使用してポリマーの構造を明確に確認しました.
  • π 積み重ねのチェーンが充電輸送のための最適なチャネルを作成することを実証しました.

結論:

  • 結晶型一次元ポリマーの合成は,ダイナミック・コバルント化学によって達成可能である.
  • ポリマーの優れた電荷輸送特性には,π スタック構造が鍵です.
  • この研究は,電子特性を合わせた先進的なポリマー材料の開発を進めています.