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Characteristics and Nomenclature of Copolymers01:24

Characteristics and Nomenclature of Copolymers

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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...
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Polymers02:34

Polymers

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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...
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Polymers02:34

Polymers

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Cationic Chain-Growth Polymerization: Mechanism00:57

Cationic Chain-Growth Polymerization: Mechanism

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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...
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Types of Step-Growth Polymers: Polyesters01:20

Types of Step-Growth Polymers: Polyesters

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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 polymer...
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Anionic Chain-Growth Polymerization: Overview01:20

Anionic Chain-Growth Polymerization: Overview

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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,...
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Self-assembling Morphologies Obtained from Helical Polycarbodiimide Copolymers and Their Triazole Derivatives
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ブロックコポリマーヴィトリマー

Jacob J Lessard1, Georg M Scheutz1, Seung Hyun Sung2

  • 1George and Josephine Butler Polymer Research Laboratory, Center of Macromolecular Science, Department of Chemistry , University of Florida , Gainesville , Florida 32611 , United States.

Journal of the American Chemical Society
|December 4, 2019
PubMed
まとめ
この要約は機械生成です。

ビトリマーと融合したブロックコポリマーは,流れと変形に対するナノスケール制御を提供します. この新しいブロックビトリマーのクラスでは,制御されたトポロジーとマイクロフェーズ分離により,クリープ抵抗性が向上しています.

さらに関連する動画

Anionic Polymerization of an Amphiphilic Copolymer for Preparation of Block Copolymer Micelles Stabilized by &#960;-&#960; Stacking Interactions
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Synthesis of Terpolymers at Mild Temperatures Using Dynamic Sulfur Bonds in PolyS-Divinylbenzene
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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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Synthesis of Terpolymers at Mild Temperatures Using Dynamic Sulfur Bonds in PolyS-Divinylbenzene
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科学分野:

  • 材料科学
  • ポリマー化学
  • レオロギー

背景:

  • ビトリマーは動的なポリマーネットワークで,流動と再処理を可能にします.
  • ブロックコポリマーは,ポリマー構造とナノ構造への自己組み立てを正確に制御できます.
  • これらの材料を組み合わせると 調節可能な粘弾性特性を有する 高度なポリマーが生成されます

研究 の 目的:

  • アソシエティブクロスリンクダイナミクスとフローをナノスケールで制御するためにブロックコポリマーとビトリマーを融合させる.
  • これらの新しいブロックガラスの構造と性質の関係を調査する.
  • 粘着弾性行為に対するトポロジーの制御の可能性を探求する.

主な方法:

  • 定義された構造と分子量を持つブロックコポリマーを合成するために制御されたポリメリゼーション技術を使用した.
  • これらの自己組み立てブロックコポリマーから形成されたガラスの物質.
  • 粘弾性およびマクロの変形に対する耐性を特徴づけている.

主要な成果:

  • ブロックコポリマーから派生したヴィトリマーは,統計コポリマー類に比べて,マクロスコプ的変形に対する優れた耐性を示した.
  • 制御されたポリメリゼーションにより,ポリマーの構造と分子量の正確な調節が可能になり,構造特性の効果に影響を与えました.
  • 制御された鎖のトポロジーとマイクロフェーズ分離に起因するブロックビトリマーで,増強されたクリープ抵抗が観察されました.

結論:

  • ブロックビトリマーは,トポロジー制御された粘着弾性フローを持つ新しい材料のクラスを表します.
  • ブロックビトリマーのマイクロフェーズ分離構造は,変形に対する耐性を高める鍵です.
  • これらの発見は,特定の用途に合わせた粘弾性特性を有する高度な材料の設計の道を開きます.