Jove
Visualize
お問い合わせ
JoVE
x logofacebook logolinkedin logoyoutube logo
JoVEについて
概要リーダーシップブログJoVEヘルプセンター
著者向け
出版プロセス編集委員会範囲と方針査読よくある質問投稿
図書館員向け
推薦の声購読アクセスリソース図書館諮問委員会よくある質問
研究
JoVE JournalMethods CollectionsJoVE Encyclopedia of Experimentsアーカイブ
教育
JoVE CoreJoVE BusinessJoVE Science EducationJoVE Lab Manual教員リソースセンター教員サイト
利用規約
プライバシーポリシー
ポリシー

関連する概念動画

Olefin Metathesis Polymerization: Overview01:13

Olefin Metathesis Polymerization: Overview

2.2K
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...
2.2K
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
Types of Step-Growth Polymers: Polyesters01:20

Types of Step-Growth Polymers: Polyesters

2.3K
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...
2.3K
Olefin Metathesis Polymerization: Acyclic Diene Metathesis (ADMET)00:53

Olefin Metathesis Polymerization: Acyclic Diene Metathesis (ADMET)

2.0K
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...
2.0K
Radical Chain-Growth Polymerization: Chain Branching01:17

Radical Chain-Growth Polymerization: Chain Branching

2.0K
The skeletal structure of polymers synthesized via radical polymerization is always branched. For example, the polymerization of ethylene by radical polymerization results in a low-density grade of polyethylene with a heavily branched skeletal structure. Here, the radical site abstracts hydrogen from the growing chain, and the radical site shifts from the end (a primary carbon center) to anywhere within the growing chain (a secondary carbon center). Consequently, the part of the chain from the...
2.0K
Cationic Chain-Growth Polymerization: Mechanism00:57

Cationic Chain-Growth Polymerization: Mechanism

2.4K
The cationic polymerization mechanism consists of three steps: initiation, propagation, and termination. In the initiation step of the polymerization process, the π bond of a monomer gets protonated by the Lewis acid catalyst, which is formed from boron trifluoride and water. The protonation of the π bond generates a carbocation stabilized by the electron‐donating group. In the propagation step, the π bond of the second monomer acts as a nucleophile and attacks the...
2.4K

こちらも読む

関連記事

共著者、ジャーナル、引用グラフによってこの研究に関連する記事。

並び替え
Same author

Engineering and Application of a Thermostable MHETase for PET Depolymerization.

ACS sustainable chemistry & engineering·2026
Same author

Lignin to adipic acid in a high-yield chemical and biological redox process.

Nature·2026
Same author

Effects of Polymer Morphology on Solvent and Catalyst Accessibility during Polyethylene and Polystyrene Autoxidation.

JACS Au·2026
Same author

Alkylidene functionalization produces highly recyclable and scalable polyhydroxyalkanoates.

Science (New York, N.Y.)·2026
Same author

Catalytic Autoxidation for Depolymerization of Multilayer Plastic Films.

ChemSusChem·2026
Same author

Production and Evaluation of Fluorophore-Doped Polymer Substrates to Screen for Plastic-Degrading Enzymes.

ACS sustainable chemistry & engineering·2026

関連する実験動画

Updated: Sep 9, 2025

Laboratory Production of Biofuels and Biochemicals from a Rapeseed Oil through Catalytic Cracking Conversion
11:33

Laboratory Production of Biofuels and Biochemicals from a Rapeseed Oil through Catalytic Cracking Conversion

Published on: September 2, 2016

13.9K

ポリオレフィン水裂における炭素質量閉塞の方法

Anna E Brenner1, Griffin Drake1, Gregg T Beckham2,3

  • 1Department of Chemical Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, United States.

JACS Au
|August 29, 2025
PubMed
まとめ

ポリオレフィンヒドロクラッキングにおける正確な製品量化は非常に重要です. 流量収集などの強化された捕獲方法は,炭素バランスの閉鎖を大幅に改善し,プラスチックのリサイクルのための信頼性の高い収量と選択性データを可能にします.

キーワード:
炭素バランスガス染色法ハイドロクラッキングプラスチックの分解ポリエチレンZSM-5 について

さらに関連する動画

Biomass Conversion to Produce Hydrocarbon Liquid Fuel Via Hot-vapor Filtered Fast Pyrolysis and Catalytic Hydrotreating
11:28

Biomass Conversion to Produce Hydrocarbon Liquid Fuel Via Hot-vapor Filtered Fast Pyrolysis and Catalytic Hydrotreating

Published on: December 25, 2016

26.6K
Depolymerizable Olefinic Polymers Based on Fused-Ring Cyclooctene Monomers
08:12

Depolymerizable Olefinic Polymers Based on Fused-Ring Cyclooctene Monomers

Published on: December 16, 2022

3.4K

関連する実験動画

Last Updated: Sep 9, 2025

Laboratory Production of Biofuels and Biochemicals from a Rapeseed Oil through Catalytic Cracking Conversion
11:33

Laboratory Production of Biofuels and Biochemicals from a Rapeseed Oil through Catalytic Cracking Conversion

Published on: September 2, 2016

13.9K
Biomass Conversion to Produce Hydrocarbon Liquid Fuel Via Hot-vapor Filtered Fast Pyrolysis and Catalytic Hydrotreating
11:28

Biomass Conversion to Produce Hydrocarbon Liquid Fuel Via Hot-vapor Filtered Fast Pyrolysis and Catalytic Hydrotreating

Published on: December 25, 2016

26.6K
Depolymerizable Olefinic Polymers Based on Fused-Ring Cyclooctene Monomers
08:12

Depolymerizable Olefinic Polymers Based on Fused-Ring Cyclooctene Monomers

Published on: December 16, 2022

3.4K

科学分野:

  • 化学工学
  • 材料科学
  • カタリシス

背景:

  • ポリオレフィン水力クラッキングは プラスチックの廃棄物の再利用のルートを提示しています
  • 不一致した生産量測定方法は,精密な収穫量と選択性の決定を妨げます.
  • 重要な炭素バランス赤字 (50%以上) が,製品の損失のために報告されています.

研究 の 目的:

  • ポリオレフィン水力クラッキングにおける主要製品の損失源を特定する.
  • 定量測定の精度を高めるために,改良された製品捕獲方法を開発し,評価する.
  • 最適な捕獲方法を選択するためのガイドラインを提示します.

主な方法:

  • 蒸気回収と液相保持のための7つの補足技術を評価した.
  • 変動率の上昇,システムの容量,または変動率の減少に基づいた評価方法
  • ヘリウムスイープとガスサンプリングバッグを使った流量収集方法.

主要な成果:

  • 流量収集は最高回収 (96 ± 9.2%の炭素バランス閉鎖) を達成した.
  • 方法の有効性は,製品の分布 (凝縮可能なガスと軽いガス) に依存する.
  • 溶媒添加は凝縮性の高い製品に有効であり,混合製品にはフロー収集である.

結論:

  • ポリオレフィン水分解には,単一の製品捕獲プロトコルが普遍的に最適ではありません.
  • 正確な分析のために,方法特有の作業戦略は不可欠です.
  • 開発されたガイドラインは,強力な製品キャプチャと信頼性の高いデータ生成を促進します.