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相关概念视频

Olefin Metathesis Polymerization: Overview01:13

Olefin Metathesis Polymerization: Overview

2.0K
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...
2.0K
Ziegler–Natta Chain-Growth Polymerization: Overview01:17

Ziegler–Natta Chain-Growth Polymerization: Overview

3.2K
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...
3.2K
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
Anionic Chain-Growth Polymerization: Mechanism01:04

Anionic Chain-Growth Polymerization: Mechanism

2.0K
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...
2.0K
Carboxylic Acids to Methylesters: Alkylation using Diazomethane01:33

Carboxylic Acids to Methylesters: Alkylation using Diazomethane

2.1K
Carboxylic acids react with diazomethane in an ether solvent via alkylation at the carboxylate oxygen atom to give methyl esters of the corresponding acid with excellent yields.
2.1K
Anionic Chain-Growth Polymerization: Overview01:20

Anionic Chain-Growth Polymerization: Overview

2.1K
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,...
2.1K

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A Simple and Efficient Protocol for the Catalytic Insertion Polymerization of Functional Norbornenes
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证明核心外酸催化剂在去聚合聚碳酸中的有效性.

Onofrio Losito1, Pasquale Pisani1, Alessia De Cataldo1,2

  • 1Chemistry Department, University of Bari Aldo Moro, Via E. Orabona 4, 70126 Bari, Italy.

Polymers
|November 27, 2024
PubMed
概括

这项研究引入了新的核心外二氧化催化剂,用于高效的聚碳酸 (PC) 化学回收. 这些催化剂可以实现高纯单体产量,从而实现可持续的PC材料合成.

关键词:
核心外催化剂的核心外催化剂脱聚合脱聚合的过程离子液体是有离子的液体.聚碳酸聚碳酸的使用情况石是什么意思? 石是什么意思?氧化氧化的使用方法

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Imine Metathesis by Silica-Supported Catalysts Using the Methodology of Surface Organometallic Chemistry
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科学领域:

  • 材料科学 材料科学 材料科学
  • 化学工程是化学工程的重要组成部分.
  • 聚合物化学 聚合物化学

背景情况:

  • 聚碳酸 (PC) 是一种耐用,高性能的塑料,广泛使用,但由于其稳定性,难以回收利用.
  • 当前的PC回收方法,如机械回收和热解,有其局限性.
  • 化学回收,特别是脱聚合,提供了一个回收单体的途径,但通常需要恶劣的条件或催化剂.

研究的目的:

  • 调查聚碳酸脱聚合物的异质核心外二氧化催化剂的有效性.
  • 为聚碳酸废物开发一种可持续和高效的化学回收方法.
  • 探索新的催化剂,包括核心外Si-ILs-ZnO,用于聚碳酸氨解.

主要方法:

  • 使用XRD,SEM_EDX,FT-IR和ICP-OES进行核心外二氧化催化剂 (Sc(III) 酸盐,Si-ILs,Si-ILs-ZnO) 的合成和表征.
  • 在受控条件下 (60-150°C,12-24小时) 使用氧和核友的聚碳酸通过氨解和酒解去聚合.
  • 使用GC/MS和GPC染色学监测脱聚合过程.

主要成果:

  • 核心外二氧化催化剂在聚碳酸脱聚合过程中表现出高效率.
  • 氨解反应达到高达75%的产量,产生高纯度的聚碳酸单体.
  • 新型核心外Si-ILs-ZnO催化剂在此应用中显示出显著的潜力.

结论:

  • 核心氧化催化剂为聚碳酸化学回收提供了一种可持续和高效的方法.
  • 回收的单体可以重复使用,用于合成新的聚碳酸材料,促进循环经济.
  • 该研究强调了异质催化在推进聚合物回收技术方面的潜力.