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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

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

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

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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...
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Olefin Metathesis Polymerization: Overview01:13

Olefin Metathesis Polymerization: Overview

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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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Olefin Metathesis Polymerization: Acyclic Diene Metathesis (ADMET)00:53

Olefin Metathesis Polymerization: Acyclic Diene Metathesis (ADMET)

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Acyclic diene metathesis polymerization or ADMET polymerization involves cross-metathesis of terminal dienes, such as 1,8-nonadiene, to give linear unsaturated polymer and ethylene. As ADMET is a reversible process, the formed ethylene gas must be removed from the reaction mixture to complete the polymerization process.
Similar to cross-metathesis, ADMET also involves the formation of metallacyclobutane intermediate by [2+2] cycloaddition of one of the double bonds of a terminal diene with...
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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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Depolymerizable Olefinic Polymers Based on Fused-Ring Cyclooctene Monomers
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化学的にリサイクル可能なサイクロアルキル置換ポリヒドロキシアルカノ酸に基づく超硬い熱可塑性エラストマー

Hao-Yi Huang1, Min Xie1, Si-Qi Wang1

  • 1National Engineering Laboratory of Eco-Friendly Polymeric Materials (Sichuan), College of Chemistry, Sichuan University, 29 Wangjiang Rd, Chengdu, 610064, P. R. China.

Journal of the American Chemical Society
|February 20, 2025
PubMed
まとめ

新しいプロピオラクトン単体であるα-スパイロ・サイクロヘキシル・プロピオラクトン (SHPL) は,ポリヒドロキシアルカノアートの効率的な化学的リサイクルを可能にします. この持続可能なモノメアは 優れた強度と弾性を持つ高性能の熱可塑性エラストマーを生成します

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Fabricating Degradable Thermoresponsive Hydrogels on Multiple Length Scales via Reactive Extrusion, Microfluidics, Self-assembly, and Electrospinning
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科学分野:

  • ポリマー化学
  • 持続可能な素材
  • 化学 リサイクル

背景:

  • ポリヒドロキシアルカノ酸 (PHAs) をプロピオラクトン単体に化学的に再利用することは,高いリングストレスと副作用により困難です.
  • PHAモノマー回収の効率的で持続可能な経路の開発は,循環経済原理にとって極めて重要です.

研究 の 目的:

  • リング開きポリメリゼーションと効率的な脱ポリメリゼーションのための強化された反応性を持つ新しいプロピオラクトンモノマーを設計する.
  • この新しいモノメアの高性能熱可塑弾性体 (TPE) の合成の可能性を調査する.

主な方法:

  • α-スパイロ・サイクロヘキシル・プロピオラクトン (SHPL) の設計と合成
  • 低触媒負荷 (<1ppm) のSHPLのリング開きポリメリゼーション
  • 結果として生成されるポリ・ヒドロキシ-2-スパイロ・サイクロヘキシルプロピオネート (P3HSHP) の脱ポリマー化.
  • SHPLと ε-カプロラクトン (CL) のワンポット共ポリメリゼーションにより,TPEが生成される.

主要な成果:

  • SHPLはリング開きポリメリゼーションにおいて高い反応性を表している.
  • P3HSHPは高熱安定性 (Td = 364 °C,Tm = 272 °C) を示し,副産物なしで86%の収量でSHPLに脱ポリマー化することができます.
  • CLとSHPLのグラデントコポリマー (P(CL2000-grad-SHPL500)) は,牽引強度 (58.8MPa),伸縮性 (1959%) 性 (600MJ/m3) 弾性回復率 (>90) の優れた特性を示しています.

結論:

  • 新型SHPLモノメアは,プロピオラクトンベースのPHAリサイクルにおける課題を克服しています.
  • SHPLは高性能で持続可能な熱可塑性エラストマーの製造を容易にする.
  • この進歩は 循環型経済のための 先進的な材料の開発を支援します