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相关概念视频

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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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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Molecular Weight of Step-Growth Polymers01:08

Molecular Weight of Step-Growth Polymers

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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
ATP and Macromolecule Synthesis01:28

ATP and Macromolecule Synthesis

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Biological macromolecules are organic compounds, predominantly composed of carbon atoms. The carbon atoms are covalently bonded with hydrogen, oxygen, nitrogen, and other minor elements. There are four major biological macromolecule classes: carbohydrates, lipids, proteins, and nucleic acids.
Most macromolecules are composed of single subunits, or building blocks, called monomers. The monomers combine with each other using covalent bonds to form larger molecules known as polymers.
Conversion of...
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相关实验视频

Updated: Jun 17, 2025

Synthesis of Information-bearing Peptoids and their Sequence-directed Dynamic Covalent Self-assembly
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非生物化学渐变序列控制的聚合物,具有调整的动力学和自组装的形态学.

Kumar Siddharth1, Juan Pérez-Mercader1,2

  • 1Department of Earth and Planetary Sciences and Harvard Origins of Life Initiative, Harvard University, Cambridge, MA, 02138, USA.

Macromolecular rapid communications
|August 11, 2024
PubMed
概括

研究人员使用一式光诱导电子/能量转移-可逆添加-碎片化链转移-聚合诱导自组合 (PET-RAFT-PISA) 方法合成了渐变序列控制的聚合物. 不同的单体比与聚合物动力学和自组装结构相关.

关键词:
化学计算的化学计算渐变聚合物的渐变聚合物.聚合诱导的自我组装.可编程自组装的自组装器测序控制的聚合物.

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

  • 顺序控制聚合物的高效合成和特性相关性仍然是重大挑战.
  • 形聚合物中的梯度架构为高级应用提供可调节的特性.

研究的目的:

  • 合成渐变序列控制的聚合物,具有固定的水友性单元 (聚乙烯糖醇,PEG) 和渐变疏水尾.
  • 使用一种新的方法,建立单体度比率,聚合动力学和自我组装形态之间的相关性.

主要方法:

  • 实施一种单,均的PET-RAFT-PISA方法,用于合成渐变序控制的聚合物.
  • 使用具有对比反应性的单体2-基甲酸盐 (HPMA) 和二乙烯胺 (DAAM).
  • 对初始单体度比率的系统变化,以研究它们对聚合物形成和结构的影响.

主要成果:

  • 通过PET-RAFT-PISA成功合成了非生物化学渐变序列控制的聚合物.
  • 建立了单体料比率和聚合动力学,梯度特征,以及由此产生的自组合形态之间明确的相关性.
  • 使用NMR,TEM,DLS和GPC进行结果的表征和验证.

结论:

  • PET-RAFT-PISA方法为制造精确控制的渐变聚合物提供了一个强大的平台.
  • 可调节的单体比率可以对聚合物架构和自组装进行可预测的控制.
  • 这些发现对化学计算,可编程自组装和合成生物学有广泛的影响.