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相关概念视频

Olefin Metathesis Polymerization: Overview01:13

Olefin Metathesis Polymerization: Overview

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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...
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Ziegler–Natta Chain-Growth Polymerization: Overview01:17

Ziegler–Natta Chain-Growth Polymerization: Overview

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Ziegler–Natta polymerization is another form of addition or chain‐growth polymerization used for synthesizing linear polymers over branched polymers. The catalyst used for polymerization is the Ziegler–Natta catalyst, named after Karl Ziegler and Giulio Natta, who developed it in 1953. This catalyst is an organometallic complex of titanium tetrachloride and triethyl aluminum, with the active form of the catalyst being an alkyl titanium compound. Using the Ziegler–Natta...
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Anionic Chain-Growth Polymerization: Overview01:20

Anionic Chain-Growth Polymerization: Overview

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The polymerization process that involves carbanion as an intermediate is called anionic polymerization. It is also a type of addition or chain-growth polymerization. Anionic polymerization gets initiated by a strong nucleophile such as an organolithium or a Grignard reagent. The most commonly used initiator for anionic polymerization is butyl lithium. Monomers involved in anionic polymerization must possess a vinyl group bonded to one or two electron-withdrawing groups. For instance,...
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Anionic Chain-Growth Polymerization: Mechanism01:04

Anionic Chain-Growth Polymerization: Mechanism

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The mechanism for anionic chain-growth polymerization involves initiation, propagation, and termination steps. In the initiation step, a nucleophilic anion, such as butyl lithium, initiates the polymerization process by attacking the π bond of the vinylic monomer. As a result, a carbanion, stabilized by the electron‐withdrawing group, is generated. The resulting carbanion acts as a Michael donor in the propagation step and attacks the second vinylic monomer, which acts as a Michael...
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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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相关实验视频

Updated: Jul 16, 2025

Synthesis, Characterization, and Functionalization of Hybrid Au/CdS and Au/ZnS Core/Shell Nanoparticles
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"聚合物珠"核心-介层-外复合纳米颗粒的拨入合成

Giselle Rosetta1,2, Line Macaire1, Mike Butters3

  • 1Department of Physics, Prifysgol Aberystwyth University, Aberystwyth SY23 3BZ, UK.

Polymers
|September 9, 2023
PubMed
概括
此摘要是机器生成的。

研究人员精确地控制聚合物纳米粒子大小,使用乳液聚合,使可调节的结构颜色在聚合物中.

关键词:
核心外纳米粒子的核心外纳米粒子.乳液聚合物化的乳液.聚合物复合物的聚合物复合物.工艺工程是过程工程.在"拨号"处理中.

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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
  • 纳米技术 纳米技术

背景情况:

  • 核心-介层-外聚合物纳米粒子通过乳液聚合合成.
  • 对光子材料来说,控制纳米粒子大小和单分散性至关重要.
  • 聚合物石的结构颜色取决于颗粒的排列.

研究的目的:

  • 为精确控制聚钢 (PS) 芯尺寸和单分散性而设计乳液聚合物.
  • 开发一种"拨号"过程,用于预测核心大小和由此产生的结构颜色.
  • 为了实现光子应用的聚合物晶石的可扩展制造.

主要方法:

  • 实验参数的优化:温度,反应剂的纯度和率.
  • 核心-间层-外纳米颗粒与聚乙烯核心,聚甲基酸 (PMMA) 间层和聚乙烯酸 (PEA) 的合成.
  • 纳米颗粒尺寸的表征,单分散性 (多分散性指数<0.02),以及切割顺序到烯膜.

主要成果:

  • 确定了最佳反应温度 (60-70°C),产生高度单分散的PS核 (PDI < 0.02).
  • 证明了核心-介层-外纳米粒子的成功合成.
  • 实现了复合物颗粒的剪切排序成可预测的结构颜色的奥巴林薄膜,基于核心尺寸.

结论:

  • 乳液聚合为光子材料提供了对纳米粒子合成的精确控制.
  • 一个"拨入"过程,将反应时间与核心大小和结构颜色相关联,是可行的.
  • 开发的方法适用于工业规模的聚合物石制造.