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Cationic Chain-Growth Polymerization: Mechanism00:57

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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...
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Anionic Chain-Growth Polymerization: Mechanism01:04

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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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Radical Chain-Growth Polymerization: Mechanism01:09

Radical Chain-Growth Polymerization: Mechanism

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The radical chain-growth polymerization mechanism consists of three steps: initiation, propagation, and termination of polymerization. The polymerization initiates when a free radical generated from the radical initiator adds to the unsaturated bond in the monomer. The unpaired electron of the free radical and one π electron in the unsaturated bond creates a σ bond between the free radical and the monomer. As a result, the other π electron in the unsaturated bond converts this...
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Polymers

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The word polymer is derived from the Greek words “poly” which means “many” and “mer” which means “parts”. Polymers are long chains of molecules composed of repeating units of smaller molecules, known as monomers. They either occur naturally, such as DNA and proteins, or can be constructed synthetically, like plastics. They have varied structural characteristics, such as linear chains, branched chains, or complex networks, that contribute to the...
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Step-Growth Polymerization: Overview01:03

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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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Anionic Chain-Growth Polymerization: Overview01:20

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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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酶反应网络驱动的聚合诱导的过渡性化.

Surbhi Sharma1, Andrea Belluati2, Mohit Kumar1

  • 1Department of Chemistry, Johannes Gutenberg University Mainz, Duesbergweg 10-14, Mainz, 55122, Germany.

Angewandte Chemie (International ed. in English)
|December 10, 2024
PubMed
概括

研究人员开发了一种由酶驱动的系统,用于控制ATP驱动的协,模仿细胞过程. 这种酶反应网络 (ERN) 能够为仿生应用和人工细胞开发提供可调节的动态.

关键词:
这就是ATPATPATP ATP.生物ATRP的生物ATRP是什么协同生活的动物 协同生活的动物酶反应网络的酶反应网络液态-液态相隔离器 液态-液态相隔离器

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科学领域:

  • 生物模拟化学是生物模拟化学.
  • 合成生物学 合成生物学
  • 聚合物化学 聚合物化学

背景情况:

  • 活细胞表现出复杂的微环境,具有高度精确和高效的酶驱动过程.
  • 在这种动态过程中实现可比的体外控制仍然是一个挑战.

研究的目的:

  • 设计一个酶反应网络 (ERN),它结合了对立和正交的酶网络.
  • 为了实现可调节的ATP驱动的短暂协的动态.
  • 为了探索生物仿真应用,对凝聚和溶解的酶控制.

主要方法:

  • 通过蜂过氧化酶 (HRP) 介导的生物催化性原子转移基聚合物 (BioATRP) 合成的聚 ((二甲基甲基甲基酸).
  • 形成了ATP-coacervates,并通过性酸酶,肌酸酸酶,酸酶,酸酶,酸酶,酸酶和尿酸酶探索了酶控制.
  • 为系统控制开发了ERN聚合诱导的短暂协 (ERN-PIC).

主要成果:

  • 通过使用对抗性和正交的酶对来证明ATP驱动的短暂协的可调节动力学.
  • 展示了以ATP为燃料的协同体的潜力,作为能够进行酶催化的细胞微反应器.
  • 使用ERN-PIC实现了对聚合,凝聚和溶解的完全控制.
  • 观察到,同化过程会影响功能性质,比如选择性货物吸收.

结论:

  • 开发的ERN战略提供了尖端的仿生应用和对细胞分隔的洞察力.
  • 这种方法弥合了合成和生物系统之间的差距.
  • 暂时编程的协化为多酶级联的空间布局和设计人工细胞提供了一个有前途的平台.