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相关概念视频

Characteristics and Nomenclature of Copolymers01:24

Characteristics and Nomenclature of Copolymers

2.5K
Copolymers are the products obtained from the polymerization of multiple monomer species. So, in a polymer chain itself, there can be multiple repeating units that come from different monomers. The process of synthesizing a polymer from different monomer species is called copolymerization. When two monomers are involved, the polymer is known as a bipolymer. Polymers with three and four monomers are termed terpolymers and quaterpolymers, respectively. Figure 1 depicts the copolymerization of...
2.5K
Molecular Weight of Step-Growth Polymers01:08

Molecular Weight of Step-Growth Polymers

2.2K
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...
2.2K
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
Cationic Chain-Growth Polymerization: Mechanism00:57

Cationic Chain-Growth Polymerization: Mechanism

2.3K
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...
2.3K
Polymer Classification: Stereospecificity01:26

Polymer Classification: Stereospecificity

2.4K
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
Polymers: Molecular Weight Distribution01:10

Polymers: Molecular Weight Distribution

3.3K
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.
3.3K

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相关实验视频

Updated: Jun 20, 2025

Self-assembling Morphologies Obtained from Helical Polycarbodiimide Copolymers and Their Triazole Derivatives
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Self-assembling Morphologies Obtained from Helical Polycarbodiimide Copolymers and Their Triazole Derivatives

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统计共聚化诱导的自组装.

Meng Huo1, Ruixue Zhu1

  • 1Department of Chemistry, Zhejiang Sci-Tech University, Hangzhou 310018, China.

ACS macro letters
|July 18, 2024
PubMed
概括
此摘要是机器生成的。

统计共聚化诱导的自组合 (stat-PISA) 在一个步骤中创建稳定,高度的聚合物组合. 这些组件显示出作为优越的皮克林乳化剂的前景,适用于工业规模的自由基聚合.

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Using Polystyrene-block-polyacrylic acid-coated Metal Nanoparticles as Monomers for Their Homo- and Co-polymerization
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Synthesis of Monodisperse Cylindrical Nanoparticles via Crystallization-driven Self-assembly of Biodegradable Block Copolymers
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相关实验视频

Last Updated: Jun 20, 2025

Self-assembling Morphologies Obtained from Helical Polycarbodiimide Copolymers and Their Triazole Derivatives
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Using Polystyrene-block-polyacrylic acid-coated Metal Nanoparticles as Monomers for Their Homo- and Co-polymerization
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Synthesis of Monodisperse Cylindrical Nanoparticles via Crystallization-driven Self-assembly of Biodegradable Block Copolymers
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科学领域:

  • 聚合物化学 聚合物化学
  • 材料科学 材料科学 材料科学
  • 超分子化学 超分子化学

背景情况:

  • 统计共聚合物由于简单的合成和功能化而被广泛使用.
  • 统计共聚物的传统自组装方法存在高界面能量,不稳定性和低度的问题.
  • 现有的方法限制了统计共聚合物组件的实际应用.

研究的目的:

  • 引入统计共聚化诱导的自我组装 (stat-PISA) 作为一个一般的策略.
  • 展示一种单步方法,以制备具有高固体含量的稳定统计共聚合物组件.
  • 探索这些组件作为皮克林乳化剂的潜力.

主要方法:

  • 使用带电水友性单体和核心形成单体的分散聚合.
  • 使用与相互连接的网络中间体的旋点分解机制.
  • 调整组装属性通过不同的单体分数,聚合物长度和固体含量.

主要成果:

  • 通过stat-PISA.成功地产生了球状小粒.
  • 该过程证明了基于关键参数的鱼性.
  • 与区块共聚合物对应物相比,统计共聚合物微粒表现出优越的皮克林乳化性能.
  • 该策略在各种表面电荷和化学成分中得到了验证.

结论:

  • Stat-PISA是一种多功能的一步方法,用于创建稳定的统计共聚合物组件.
  • 这些组件作为皮克林乳化剂提供了增强的性能.
  • 传统的自由基聚合物的可行性表明了重要的工业扩展潜力.