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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

2.7K
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...
2.7K
Polymers: Molecular Weight Distribution01:10

Polymers: Molecular Weight Distribution

4.7K
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.
4.7K
Polymers: Defining Molecular Weight01:01

Polymers: Defining Molecular Weight

3.7K
Unlike small molecules with definite molecular weights, polymers are a mixture of individual polymer chains of varying lengths, each with a unique molecular weight.  So, the molecular weight of a polymer is expressed as an average value based on the average size of the polymer chains. The two most common forms of averages used for polymers are the number average molecular weight and weight average molecular weight.
The number average molecular weight (Mn) is the summation of the number...
3.7K
Olefin Metathesis Polymerization: Ring-Opening Metathesis Polymerization (ROMP)01:16

Olefin Metathesis Polymerization: Ring-Opening Metathesis Polymerization (ROMP)

3.1K
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...
3.1K
Step-Growth Polymerization: Overview01:03

Step-Growth Polymerization: Overview

4.3K
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...
4.3K
Polymer Classification: Architecture01:14

Polymer Classification: Architecture

3.7K
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...
3.7K

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関連する実験動画

Updated: Jan 16, 2026

Depolymerizable Olefinic Polymers Based on Fused-Ring Cyclooctene Monomers
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Depolymerizable Olefinic Polymers Based on Fused-Ring Cyclooctene Monomers

Published on: December 16, 2022

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リング膨張ポリメリゼーションにおける温度制御サイクルポリエステル分子量

Jinxing Jiang1, Ge Yao2, Yaqin Cui1

  • 1Key Laboratory of Advanced Optoelectronic Functional Materials of Gansu Province, Key Laboratory for New Molecule Materials Design and Function of Gansu Universities, College of Chemical Engineering and Technology, Tianshui Normal University, Tianshui 741001, China.

Journal of the American Chemical Society
|October 2, 2025
PubMed
まとめ

この研究は,ポリメリゼーション温度を調整することによって,周期的なポリエステル分子量に対する正確な制御を示しています. この方法は,高温のガラス化過程で,ポリセリチルフェニルグリコリドの調節可能な合成を可能にします.

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Controlled Photoredox Ring-Opening Polymerization of O-Carboxyanhydrides Mediated by Ni/Zn Complexes
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Controlled Photoredox Ring-Opening Polymerization of O-Carboxyanhydrides Mediated by Ni/Zn Complexes

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Ethylene Polymerizations Using Parallel Pressure Reactors and a Kinetic Analysis of Chain Transfer Polymerization
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Ethylene Polymerizations Using Parallel Pressure Reactors and a Kinetic Analysis of Chain Transfer Polymerization

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関連する実験動画

Last Updated: Jan 16, 2026

Depolymerizable Olefinic Polymers Based on Fused-Ring Cyclooctene Monomers
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Depolymerizable Olefinic Polymers Based on Fused-Ring Cyclooctene Monomers

Published on: December 16, 2022

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Controlled Photoredox Ring-Opening Polymerization of O-Carboxyanhydrides Mediated by Ni/Zn Complexes
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Controlled Photoredox Ring-Opening Polymerization of O-Carboxyanhydrides Mediated by Ni/Zn Complexes

Published on: November 21, 2017

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Ethylene Polymerizations Using Parallel Pressure Reactors and a Kinetic Analysis of Chain Transfer Polymerization
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Ethylene Polymerizations Using Parallel Pressure Reactors and a Kinetic Analysis of Chain Transfer Polymerization

Published on: November 27, 2015

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科学分野:

  • ポリマー化学
  • 材料科学

背景:

  • 環膨張ポリメリゼーションによるサイクルポリエステルの合成は,特に分子量制御において困難である.
  • 正確な分子量制御はポリマーの特性を調整するために不可欠です.

研究 の 目的:

  • サイクルポリエステルの分子量を簡単に制御する方法を開発する.
  • ポリメリゼーション温度と分子量制御の関係を調べる
  • 調節可能な分子量と高温の結晶変異を伴うポリセリチルフェニルグリコリドを合成する.

主な方法:

  • サイクルエステルの鎖成長ポリメリゼーションが採用された.
  • ポリメリゼーションとサイクリングの速度を調節するためにポリメリゼーション温度が調整されました.
  • ゲル浸透クロマトグラフィー,質量スペクトロメトリー,原子力顕微鏡を用いて分子重量を特徴づけた.

主要な成果:

  • ポリセリチルフェニルグリコリドの分子量は32. 2から189. 0kg/molまで順調に制御されました.
  • 分子重量の自然対数とポリメリゼーション温度との間には逆の関係が見られた.
  • フェニル群の組み込みにより,ガラス化温度が116.6 °Cに達した.

結論:

  • ポリメリゼーション温度を調整することで,周期的なポリエステル分子量を制御する効果的な戦略が提供されます.
  • このアプローチは,望ましい熱的性質を持つ量身のサイクルポリエステルの合成を容易にする.