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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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Plasticizers01:31

Plasticizers

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Water-reducers, or plasticizers, are chemical admixtures used in concrete to improve strength and workability. These additives reduce the water-cement ratio without compromising workability, lower the cement content while maintaining the same workability, or increase workability to assist concrete placement in inaccessible areas.
Plasticizers function by using surface-active agents to create repulsive electrostatic forces between cement particles. This dispersion enhances the concrete's...
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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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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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Ziegler–Natta Chain-Growth Polymerization: Overview01:17

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Ziegler–Natta polymerization is another form of addition or chain‐growth polymerization used for synthesizing linear polymers over branched polymers. The catalyst used for polymerization is the Ziegler–Natta catalyst, named after Karl Ziegler and Giulio Natta, who developed it in 1953. This catalyst is an organometallic complex of titanium tetrachloride and triethyl aluminum, with the active form of the catalyst being an alkyl titanium compound. Using the Ziegler–Natta...
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Olefin Metathesis Polymerization: Acyclic Diene Metathesis (ADMET)00:53

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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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リグニン系メトキシテレフタラート 性能強化ポリマーおよび可塑剤

Gloria Rosetto1, Katherine A Chism1, Luana Cardinale2

  • 1Renewable Resources and Enabling Sciences Center, National Renewable Energy Laboratory, Golden, CO 80401, United States.

ACS sustainable chemistry & engineering
|August 26, 2025
PubMed
まとめ

リグニン製のバイオメトキシテレフタラートは ポリエステルや可塑剤の持続可能な代替品です これらの化合物は,ポリエチレンテレフタレットの性質を調節し,ポリビニル塩化物の性能を向上させ,石油化学製品への依存を軽減します.

キーワード:
バイオベースの化学物質バイオベースのポリマー電気化学カルボキシル化機能的な代替性能が優れているバイオ製品

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Extraction of Lignin with High &#946;-O-4 Content by Mild Ethanol Extraction and Its Effect on the Depolymerization Yield
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科学分野:

  • 緑の化学と持続可能な材料
  • ポリマー科学と工学
  • バイオマスの利用

背景:

  • リグニン由来のアロマティックカルボキシル酸は,価値あるバイオベースの構成要素です.
  • 現在のポリエステルと可塑剤は 石油化学の原料に依存しています
  • 調整可能な特性を有する 持続可能な代替手段が必要です

研究 の 目的:

  • 石油化学品の代替品としてのリグニン由来メトキシテレフタラートを合成し,評価する.
  • ポリエチレンテレフタラート (PET) のコモノマーとしての使用を調査する.
  • ポリビニル塩化物 (PVC) の可塑剤としての効果を評価する.

主な方法:

  • リグニンモノメアの電気化学カルボキシル化によりメトキシテレフタラートが生成される.
  • メトキシテレフタル酸とジメチルテレフタル酸の共ポリマー化により,PETの共ポリマーを形成する.
  • PVCの可塑剤としてのメトキシテレフタラートエステルの評価
  • 分子ダイナミックシミュレーションで,拡散係数と揮発性を予測する.

主要な成果:

  • 2メトキシテレフタレットと2,6ジメトキシテレフタレットを 合成しました
  • >25%のメトキシテレフタラートを含有したPETコポリマーは無形になった.
  • 10モル%の負荷では,生物由来のコモノマーがPETの結晶性と融解温度を低下させた.
  • バイオ・デリバッドの可塑化剤は,PVCの用途において,石油製の同類剤に匹敵し,またはそれを上回った.
  • ダイメトキシテレフタラートエステルは,より低い揮発性と拡散を示し,使用寿命が長くなりました.

結論:

  • リグニン由来メトキシテレフタラートは,イソフタラートとフタラートの生命力のあるバイオベースの代替物です.
  • これらの化合物は,PETの特性を調整し,PVCの性能を向上させます.
  • この研究は,より持続可能なポリエステルと可塑剤への道を示しています.