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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...
2.7K
Polymer Classification: Crystallinity01:21

Polymer Classification: Crystallinity

3.7K
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...
3.7K
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...
3.1K
Characteristics and Nomenclature of Homopolymers01:00

Characteristics and Nomenclature of Homopolymers

3.8K
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.
3.8K
Ziegler–Natta Chain-Growth Polymerization: Overview01:17

Ziegler–Natta Chain-Growth Polymerization: Overview

3.8K
Ziegler–Natta polymerization is another form of addition or chain‐growth polymerization used for synthesizing linear polymers over branched polymers. The catalyst used for polymerization is the Ziegler–Natta catalyst, named after Karl Ziegler and Giulio Natta, who developed it in 1953. This catalyst is an organometallic complex of titanium tetrachloride and triethyl aluminum, with the active form of the catalyst being an alkyl titanium compound. Using the Ziegler–Natta...
3.8K
Polymer Classification: Stereospecificity01:26

Polymer Classification: Stereospecificity

3.1K
Polymerization generates chiral centers along the entire backbone of a polymer chain. Accordingly, the stereochemistry of the substituent group has a significant effect on polymer properties. Polymers formed from monosubstituted alkene monomers feature chiral carbons at every alternate position in the polymer backbone. Relative to the predominant orientation of substituents at the adjacent chiral carbons, the polymer can exist in three different configurations: isotactic, syndiotactic, and...
3.1K

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Updated: Dec 29, 2025

Synthesis of Cyclic Polymers and Characterization of Their Diffusive Motion in the Melt State at the Single Molecule Level
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シングル・クリスタル・トゥ・シングル・クリスタル・フォトポリメリゼーションによる単結晶ポリケーションポリマー

Qing-Hui Guo, Manping Jia1, Zhichang Liu2

  • 1Department of Electrical and Computer Engineering, University of California, Santa Cruz, California 95064, United States.

Journal of the American Chemical Society
|February 5, 2020
PubMed
まとめ

研究者は,新しい光ポリメリゼーション法を使用して,高プロトン伝導性を持つ単結晶ポリエレクトロライト材料を合成しました. この突破により 頑丈で安定した材料が 高度な用途に利用できます

さらに関連する動画

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

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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

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Synthesis of Cyclic Polymers and Characterization of Their Diffusive Motion in the Melt State at the Single Molecule Level
06:55

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Self-assembling Morphologies Obtained from Helical Polycarbodiimide Copolymers and Their Triazole Derivatives
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Synthesis of Monodisperse Cylindrical Nanoparticles via Crystallization-driven Self-assembly of Biodegradable Block Copolymers
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科学分野:

  • 材料科学
  • ポリマー化学
  • 超分子化学

背景:

  • 単結晶イオンポリマーの効率的な合成は困難です.
  • 分子構造と性質の関係を理解することは極めて重要です

研究 の 目的:

  • 単結晶構造と高秩序のポリケーション性ポリマー (ポリエレクトロライト) の陽子伝導性を記述する.
  • これらの材料のための高収量,グラムスケール製法を開発する.

主な方法:

  • 紫外線/太陽光によるトポケミカルポリメリゼーション.
  • ポリメリゼーションを監視するためのインサイト単結晶X線微分分析.
  • ポリマー構造,安定性,陽子伝導性の特徴

主要な成果:

  • シングル・クリスタル・トゥ・シングル・クリスタル光ポリメリゼーションによる単結晶ポリエレクトロライトのグラムスケール収量.
  • 詳細な分子構造が明らかにされ,サブナノメートルの毛穴を持つ2Dラメラーシートのコリネアポリマー鎖が示されています.
  • 特殊な熱 (500K以上) と光安定性 (254nm)
  • 陽子の伝導性は ~3 × 10−4 S cm−1である.

結論:

  • 単結晶ポリエレクトロライトの制御された合成を 完璧な戦術で示した.
  • この材料は優れた安定性と有意な陽子伝導性を示し,堅固な陽子伝導アプリケーションの可能性を示しています.