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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

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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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Polymer Classification: Architecture01:14

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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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Polymer Classification: Stereospecificity01:26

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

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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

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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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完全にリサイクル可能なバイオベースの高性能アロマティック・アリファティックポリエステル

Yi-Min Tu1, Xue-Mei Wang1, Xing Yang1

  • 1National Engineering Laboratory of Eco-Friendly Polymeric Materials (Sichuan), College of Chemistry, Sichuan University, 29 Wangjiang Road, Chengdu, 610064, People's Republic of China.

Journal of the American Chemical Society
|November 29, 2021
PubMed
まとめ

この研究は,効率的なポリメリゼーションと高分子量を達成するために,7つの環のエステルから新しいバイオベースのポリマーを導入します. これらの持続可能なポリマーは 完全にリサイクル可能で 循環型プラスチック経済が 実行可能であることを示しています

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Scalable Step-by-Step Approach of Sustainable Bioplastic Production from Food Waste
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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:

  • プラスチックの持続可能性は 世界的な課題です
  • リサイクル可能なポリマーの開発は 循環経済の鍵です
  • バイオベースのポリマーは 石油ベースのプラスチックの 持続可能な代替品です

研究 の 目的:

  • バイオベースの7つ環のエステルを設計し合成する.
  • ポリマー化行為と結果のポリマーの性質を調査する.
  • 効率的なリサイクルによってこれらのポリマーのサイクルライフサイクルを確立する.

主な方法:

  • アロマティック・グループとアリファティック・グループを持つバイオベースの7連環エステルの合成
  • 室温でのリング開封ポリメリゼーション試験
  • ポリマーの分子量,ガラス化温度 (Tg),溶解温度 (Tm),結晶化率の特徴
  • 溶液と散布のポリマー脱ポリマー化効率の評価

主要な成果:

  • モノメアは高活性 (TOF 最大2.1 × 10^5 h^-1) で容易にポリマー化され,高分子量ポリマー (Mn 最大438 kg/mol) を生成した.
  • ポリマーは,機能化によってガラス化温度 (-1 ~ 79 °C) の範囲を示した.
  • ステレオ複合ポリマーは溶解温度と結晶化率を高めました
  • ポリマーは効率的にモノマーに脱ポリマー化され,再利用性を確認しました.

結論:

  • バイオベースの新型7環エステルは高性能リサイクル可能なポリマーの有効なモノマーです.
  • 設計されたポリマーは 効率的な脱ポリマー化と再利用を通じて 循環型プラスチック経済をサポートします
  • この研究は持続可能なポリマー材料への 有望な道を示しています