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関連する概念動画

Polymer Classification: Architecture01:14

Polymer Classification: Architecture

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Polymers are classified as linear or branched on the basis of their chain architecture. The polymer chains in linear polymers have a long chain-like structure with minimal to no branching at all. Even if a polymer features large substituent groups on the monomer, which appear as branches to the skeleton, it is not considered a branched polymer. A branched polymer contains secondary polymer chains that arise from the main polymer chain. The branching occurs when the polymer growth shifts from...
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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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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...
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Olefin Metathesis Polymerization: Overview01:13

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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...
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Free-Radical Chain Reaction and Polymerization of Alkenes02:35

Free-Radical Chain Reaction and Polymerization of Alkenes

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The conversion of alkenes to macromolecules called polymers is a reaction of high commercial importance. The structure of the polymer is defined by a repeating unit, while the terminal groups are considered insignificant. The average degree of polymerization represents the number of repeating units in the polymer molecule and is denoted by the subscript n.
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Characteristics and Nomenclature of Homopolymers01:00

Characteristics and Nomenclature of Homopolymers

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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.
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化学的にリサイクル可能なポリオレフィン型マルチブロックポリマー

Yucheng Zhao1, Emma M Rettner2, Katherine L Harry1

  • 1Department of Chemistry, Colorado State University, Fort Collins, CO 80523, USA.

Science (New York, N.Y.)
|October 19, 2023
PubMed
まとめ
この要約は機械生成です。

化学的にリサイクル可能なポリオレフィンのような材料は,マルチブロックポリマーを使用して作成されました. プラスチックの廃棄物を処理する 閉ループのリサイクルプロセスの構成要素に 分解できます

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科学分野:

  • ポリマー化学
  • 材料科学
  • 持続可能なプラスチック

背景:

  • ポリオレフィンは広く使用されているプラスチックですが 廃棄とリサイクルが環境問題となり 世界的なプラスチック廃棄物危機を引き起こしています
  • ポリオレフィンの効果的なリサイクル方法は限られており,プラスチック廃棄物の管理に革新的なアプローチが必要である.
  • 持続可能なプラスチックの管理に不可欠なのが, 再生可能な先進的な材料の開発です.

研究 の 目的:

  • 化学的にリサイクル可能なポリオレフィン類の材料を開発し,調節可能な機械的特性を持つ.
  • これらの新材料の閉環リサイクルプロセスを実証する.
  • 幅広い用途に適した多用途のプラスチックを作ります

主な方法:

  • シクロオクテンのルテニウム媒介型リング開きメタテシスポリメリゼーションによる硬質と軟質のオリゴメリック建築ブロックの合成.
  • これらのオリゴメリック前駆体からマルチブロックポリマーを構成する.
  • 生成されたポリマーの機械的性質と熱的移行 (Tm,Tg) の特徴.

主要な成果:

  • エラストマーから熱プラスチックまで,幅広い機械特性を持つマルチブロックポリマーが成功して合成されました.
  • 材料は,溶融移行温度 (Tm) が最大128°C,ガラス移行温度 (Tg) が -60°Cまで低くなることを示した.
  • ポリマーを構成要素に戻すための効率的な分解が達成され,分離と再ポリマー化が可能になりました.

結論:

  • 開発されたマルチブロックポリマーは,化学的にリサイクル可能なポリオレフィンのような材料への有望な経路を提供します.
  • 機械的および熱的性質を調整する能力により,これらの材料は様々な用途に適しています.
  • 証明された閉路リサイクルプロセスは,循環経済の原則に沿ったプラスチック廃棄物管理の持続可能な解決策を提供します.