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Step-Growth Polymerization: Overview01:03

Step-Growth Polymerization: Overview

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Step-growth or condensation polymerization is a stepwise reaction of bi or multifunctional monomers to form long-chain polymers. As all the monomers are reactive, most of the monomers are consumed at the early stages of the reaction to form small chains of reactive oligomers, which then combine to form long polymer chains in the late stages. Hence, the reaction has to proceed for a long time to achieve high molecular weight polymers.
Many natural and synthetic polymers are produced by...
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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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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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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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Synthesis of Monodisperse Cylindrical Nanoparticles via Crystallization-driven Self-assembly of Biodegradable Block Copolymers
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ポリ (メチルメタクリlate) の加速された連続フロー脱ポリマー化

Katharina S C Jäger1,2, Gayathri Dev Ammini1,3, Pieter-Jan Voorter1,4

  • 1Polymer Reaction Design Group, School of Chemistry, Monash University, 19 Rainforest Walk, Building 23, Clayton, VIC 3800, Australia.

Journal of the American Chemical Society
|December 19, 2024
PubMed
まとめ
この要約は機械生成です。

インライン透析を用いたポリメチルメタクリレート (pMMA) の連続流離脱ポリメリゼーションは,モノメアの回復を大幅に改善します. この方法は,工業用途のポリマー濃度と反応効率を高めます.

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科学分野:

  • ポリマー化学
  • 化学工学
  • 材料科学

背景:

  • ポリメチルメタクリlate (pMMA) のデポリメリゼーションはリサイクルに不可欠です.
  • 従来のバッチプロセスは,ポリマー濃度と効率の限界に直面しています.
  • リバーシブル・アディション・フラグメンテーション・チェーン・トランスファー (RAFT) ポリメリゼーションは,pMMAを合成するための制御された方法である.

研究 の 目的:

  • pMMAの脱ポリマー化のための効率的な連続フロー方法を開発する.
  • モノマー回収と反応変換率を改善する.
  • 工業的なスケールでのメタクリlateのデポリメリゼーションの可行性を評価する.

主な方法:

  • モノマーを即座に除去するためのインライン透析装置を備えた連続流量反応器を使用した.
  • RAFTポリメリゼーションで合成されたpMMAの脱ポリメリゼーションを調査した.
  • 温度,ポリマー濃度,および原子炉の改変による影響が検討された.

主要な成果:

  • 160 °Cで触媒なしで1M濃度で最大68%のモノマー回復を達成した.
  • ポリマーの濃度が 20 倍増加した.
  • インライン透析はデポリメリゼーションの均衡を効果的にシフトさせ,変換を強化しました.

結論:

  • インライン透析による連続流のアプローチは,工業的なpMMAリサイクルを大幅に促進します.
  • 溶媒の使用量の減少,動作温度範囲の拡大,ポリマー濃度の増加が重要な利点です.
  • この方法は,持続可能なメタクリlateポリマー処理のための実用的な経路を提供します.