関連する実験動画

Updated: Jul 24, 2025

Depolymerizable Olefinic Polymers Based on Fused-Ring Cyclooctene Monomers
08:12

Depolymerizable Olefinic Polymers Based on Fused-Ring Cyclooctene Monomers

Published on: December 16, 2022

3.4K

グルコース炭酸塩ベースのモノマー置換パターンと置換剤の微妙な変化によるリング開きポリメリゼーション結果の実質的な差異の解明

Yidan Shen, Mingwan Leng, Yunchong Yang

    Journal of the American Chemical Society
    |July 6, 2023
    PubMed
    まとめ

    グルコース炭酸モノメアの置換物は,リング開きポリメリゼーションとポリカーボネート特性に大きな影響を及ぼします. エーテル群はレジオレギュラーなポリマーを生み出し,炭酸群は脊髄の不規則性を引き起こし,スルフォニルウレタン群はポリメリゼーションを防ぐ.

    さらに関連する動画

    Controlled Photoredox Ring-Opening Polymerization of O-Carboxyanhydrides Mediated by Ni/Zn Complexes05:48

    Controlled Photoredox Ring-Opening Polymerization of O-Carboxyanhydrides Mediated by Ni/Zn Complexes

    Published on: November 21, 2017

    8.1K
    Synthesis of Monodisperse Cylindrical Nanoparticles via Crystallization-driven Self-assembly of Biodegradable Block Copolymers11:42

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

    Published on: June 20, 2019

    7.9K

    関連する概念動画

    Olefin Metathesis Polymerization: Ring-Opening Metathesis Polymerization (ROMP)01:16

    Olefin Metathesis Polymerization: Ring-Opening Metathesis Polymerization (ROMP)

    Ring-opening metathesis polymerization or ROMP involves strained cycloalkenes as starting materials. The mechanism of ROMP proceeds by reacting cycloalkene with Grubbs catalyst to give metallacyclobutane intermediate which undergoes a ring-opening reaction to form new carbene. The new carbene reacts with another molecule of cycloalkene. Repetition of these steps leads to the formation of an unsaturated open-chain polymer product. All these steps are reversible, however, relieving the ring...
    2.6K
    Step-Growth Polymerization: Overview01:03

    Step-Growth Polymerization: Overview

    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...
    3.5K
    Polymer Classification: Stereospecificity01:26

    Polymer Classification: Stereospecificity

    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...
    2.5K
    Olefin Metathesis Polymerization: Overview01:13

    Olefin Metathesis Polymerization: Overview

    Recently, the development of olefin metathesis polymerization advanced the field of polymer synthesis. Simply put, the reorganization of substituents on their double bonds between two olefins in the presence of a catalyst is known as the olefin metathesis reaction. The use of metathesis reaction for polymer synthesis is called olefin metathesis polymerization.
    Ruthenium-based Grubbs catalyst is the most commonly used catalyst for olefin metathesis polymerization. Grubbs catalyst consists...
    2.2K
    Characteristics and Nomenclature of Copolymers01:24

    Characteristics and Nomenclature of Copolymers

    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...
    2.6K
    Base-Catalyzed Ring-Opening of Epoxides02:26

    Base-Catalyzed Ring-Opening of Epoxides

    Due to their highly strained structures, epoxides can readily undergo ring-opening reactions through nucleophilic substitution, either in the presence of an acid or a base. The nucleophilic substitution reactions in the presence of acid are called acid-catalyzed ring-opening reactions, and nucleophilic substitution reactions in the presence of a base are called base-catalyzed ring-opening reactions. Epoxides undergo base-catalyzed ring-opening reactions in the presence of a strong nucleophile...
    8.7K