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関連する概念動画

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

Free-Radical Chain Reaction and Polymerization of Alkenes

8.1K
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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Polymer Classification: Stereospecificity01:26

Polymer Classification: Stereospecificity

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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...
2.6K
Polymer Classification: Architecture01:14

Polymer Classification: Architecture

2.9K
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...
2.9K
Characteristics and Nomenclature of Homopolymers01:00

Characteristics and Nomenclature of Homopolymers

3.2K
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.
3.2K
Olefin Metathesis Polymerization: Ring-Opening Metathesis Polymerization (ROMP)01:16

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

2.7K
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...
2.7K

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Updated: Sep 5, 2025

Designed for Molecular Recycling: A Lignin-Derived Semi-aromatic Biobased Polymer
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化学的にリサイクル可能なエステル結合ポリプロピレン

Andrew L Kocen1, Shilin Cui1, Ting-Wei Lin1

  • 1Department of Chemistry and Chemical Biology, Baker Laboratory, Cornell University, Ithaca, New York 14853-1301, United States.

Journal of the American Chemical Society
|July 6, 2022
PubMed
まとめ
この要約は機械生成です。

この研究では,プロピレンとブタディエンの共ポリメリゼーションのための新しい触媒を導入し,ポリオレフィンの化学的リサイクルを可能にします. このプロセスは,従来のポリオレフィンと同様の性質を持つ,リサイクル可能なエステル結合ポリプロピレンを生成します.

さらに関連する動画

Depolymerizable Olefinic Polymers Based on Fused-Ring Cyclooctene Monomers
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The Effect of Construction and Demolition Waste Plastic Fractions on Wood-Polymer Composite Properties
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The Effect of Construction and Demolition Waste Plastic Fractions on Wood-Polymer Composite Properties

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Depolymerizable Olefinic Polymers Based on Fused-Ring Cyclooctene Monomers
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The Effect of Construction and Demolition Waste Plastic Fractions on Wood-Polymer Composite Properties
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科学分野:

  • ポリマー化学
  • 材料科学
  • 持続可能な化学

背景:

  • ポリオレフィンは,優れた特性を持つが,リサイクルが限られた商品材料として広く使用されています.
  • ポリオレフィンの現在のリサイクル方法は不十分であり,大量廃棄につながっています.
  • ポリオレフィンの化学リサイクル経路の開発は,持続可能性にとって極めて重要です.

研究 の 目的:

  • プロピレンとブタディエンの同選択共ポリマー化のための新しい触媒を開発する.
  • エステル結合ポリプロピレンを生産するための化学的リサイクルプロセスを確立する.
  • 新しく合成されたエステル結合ポリプロピレンの再利用性を実証する.

主な方法:

  • 新しい触媒を用いたプロピレンとブタディエンの同ポリマー化.
  • オレフィンメタテシスによるテレケリックマクロモノマーへの不飽和コポリマー分解.
  • マクロモノマーを水素化し,エステル結合ポリプロピレンを形成する.

主要な成果:

  • 新しい触媒はプロピレン共聚化において1,4-ブタジエンの挿入に対して高い選択性を示した.
  • このプロセスは,線形低密度ポリエチレンに匹敵する特性を有するテレケリックマクロモノマーとエステル結合ポリプロピレンを生成した.
  • エステル結合ポリプロピレンは,テレケリックマクロノモナーにデポリメリゼーションされ,化学的リサイクルが可能です.

結論:

  • ポリオレフィンの有効な化学的リサイクル経路は,新しい触媒プロセスを通じて確立されています.
  • 開発された方法は,不飽和のポリオレフィンを望ましい性質を持つ再生可能な材料に変換します.
  • このアプローチは,ポリオレフィン廃棄物の管理に持続可能な代替手段を提供しています.