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Characteristics and Nomenclature of Copolymers01:24

Characteristics and Nomenclature of Copolymers

3.1K
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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Step-Growth Polymerization: Overview01:03

Step-Growth Polymerization: Overview

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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...
4.2K
Cationic Chain-Growth Polymerization: Mechanism00:57

Cationic Chain-Growth Polymerization: Mechanism

2.7K
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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Synthesis of Monodisperse Cylindrical Nanoparticles via Crystallization-driven Self-assembly of Biodegradable Block Copolymers
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シーケンス制御された多成分自己組み立てによる自己分類,ランダムおよびブロック超分子共ポリマー

Aritra Sarkar1, Ranjan Sasmal1, Charly Empereur-Mot2

  • 1New Chemistry Unit and School of Advanced Materials (SAMAt), Jawaharlal Nehru Centre for Advanced Scientific Research (JNCASR), Jakkur, Bangalore 560064, India.

Journal of the American Chemical Society
|April 3, 2020
PubMed
まとめ

この研究は,複雑なナノ構造のための配列制御された超分子共ポリメリゼーションを示しています. 熱力学と運動学的経路を操作することで 研究者はコポリマー配列を正確に制御し 予測の課題を克服します

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Self-assembling Morphologies Obtained from Helical Polycarbodiimide Copolymers and Their Triazole Derivatives

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Controlling the Size, Shape and Stability of Supramolecular Polymers in Water
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Self-assembling Morphologies Obtained from Helical Polycarbodiimide Copolymers and Their Triazole Derivatives
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科学分野:

  • 超分子化学
  • ポリマー科学
  • ナノテクノロジー

背景:

  • マルチコンポーネントの超分子共聚化は複雑なナノ構造の構築を可能にします.
  • コポリマー構造の予測は,様々な可能な結果 (ホモポリマー,ランダム,代替,ブロック) によって困難である.
  • 分子間の相互作用と モノメア交換のダイナミクスを制御することが重要です

研究 の 目的:

  • 前例のない 2つの成分配列制御の 超分子共ポリメリゼーションを実現する
  • 超分子自己組織化における 構造予測の課題に取り組むこと
  • 熱力学と運動路線を操作して 精密な配列制御を行う.

主な方法:

  • モノメア交換率と相互作用の自由エネルギーを理解するために分子動力学シミュレーションを使用する.
  • セルフ・アセンブリ・パスと シーケンスの決定を 調べています
  • 構造照明顕微鏡 (SIM) を用いて特徴づけている.

主要な成果:

  • 前例のない 2つの成分配列制御の 超分子共ポリメリゼーションを証明した
  • シミュレーションを通じて自己組み立て経路とシーケンスの制御に関する機械的洞察を得ました.
  • SIMを使って3つの異なるシーケンスを成功裏に特徴付けました.

結論:

  • 超分子共ポリマー配列の正確な制御は,熱力学および運動的要因を操作することによって達成できます.
  • 分子ダイナミクスシミュレーションは,自己組織化メカニズムを理解するための貴重なツールです.
  • この研究は,予測可能な新興特性を持つ複雑なナノ構造の構築を進めています.