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関連する概念動画

Molecular Weight of Step-Growth Polymers01:08

Molecular Weight of Step-Growth Polymers

2.1K
Step growth polymerization involves bi or multifunctional monomers. Bifunctional monomers react to form linear step growth polymers, whereas multifunctional monomers react to form non-linear or branched polymers.
As the step-growth polymerization involves step-wise condensation of monomers, the molecular weight also builds up eventually. Consequently, high molecular weight polymers are obtained at the late stages of the polymerization, where 99% of monomers have been consumed.
The extent of the...
2.1K
Polymers: Molecular Weight Distribution01:10

Polymers: Molecular Weight Distribution

3.2K
For any given polymer, the weight average molecular weight (Mw) is higher than, if not equal to, the number average molecular weight (Mn). The only situation in which the weight average molecular weight and the number average molecular weight are equal is when a polymer consists only of chains with equal molecular weight. However, this never happens in a synthetic polymer, since it is difficult to control the polymerization process up to a molecular level with accuracy to a hundred percent.
3.2K
Polymer Classification: Stereospecificity01:26

Polymer Classification: Stereospecificity

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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...
2.4K
Polymer Classification: Architecture01:14

Polymer Classification: Architecture

2.6K
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...
2.6K
Step-Growth Polymerization: Overview01:03

Step-Growth Polymerization: Overview

3.4K
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...
3.4K

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Fabricating Degradable Thermoresponsive Hydrogels on Multiple Length Scales via Reactive Extrusion, Microfluidics, Self-assembly, and Electrospinning
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ポリメタクリlate分子量分布を彫刻するための選択的脱ポリメリゼーション

Ariana M Tamura1, Kevin A Stewart1, James B Young1

  • 1George & Josephine Butler Polymer Research Laboratory, Center for Macromolecular Science & Engineering, Department of Chemistry, University of Florida, Gainesville, Florida 32611, United States.

Journal of the American Chemical Society
|January 29, 2025
PubMed
まとめ
この要約は機械生成です。

リバーシブル・デアクティベーション・ラジカル・ポリメリゼーション (RDRP) は,制御されたポリマー脱ポリメリゼーションを可能にします. この研究では,ポリブチルメタクリlate (PBMA) の選択的脱ポリメリゼーションは,材料の性質を変化させ,データを暗号化することもできます.

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科学分野:

  • ポリマー化学
  • 材料科学

背景:

  • リバーシブル・デアクティベーション・ラジカル・ポリメリゼーション (RDRP) は,制御されたポリマー合成を可能にします.
  • 鎖末再活性化により,低温でデポリメリゼーションを誘発する方法が提供されます.

研究 の 目的:

  • 鎖末活性化を用いたポリブチルメタクリlate (PBMA) の選択的脱ポリメリゼーションを調査する.
  • PBMA混合物の分子量分布 (MWD) と粘弾性特性を制御する能力を実証する.
  • ポリマー混合物を用いてデータの暗号化の可能性を調査する.

主な方法:

  • 熱活性連鎖末端によるRDRPによるPBMAの合成
  • PBMAの選択的なデポリメリゼーションは,分子量によって異なる混合物です.
  • 脱ポリマー化前後のMWDと粘弾性特性の特徴

主要な成果:

  • 選択的な脱ポリメリゼーションはPBMA混合物のMWDを効果的に歪めた.
  • デポリメリゼーションにより,粘着弾性特性の制御された変化が達成されました.
  • 概念証明は,MWDの変更内にモールスコードを符号化することによってデータの暗号化を実証した.

結論:

  • チェーンエンド再活性化は,調節可能なポリマー改変のための実行可能な戦略です.
  • この方法は,材料の性質を変えることで"破壊的な強化"を可能にします.
  • ポリマーブレンドは情報保存媒体として機能します.