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相关概念视频

Free-Radical Chain Reaction and Polymerization of Alkenes02:35

Free-Radical Chain Reaction and Polymerization of Alkenes

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The conversion of alkenes to macromolecules called polymers is a reaction of high commercial importance. The structure of the polymer is defined by a repeating unit, while the terminal groups are considered insignificant. The average degree of polymerization represents the number of repeating units in the polymer molecule and is denoted by the subscript n.
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Olefin Metathesis Polymerization: Acyclic Diene Metathesis (ADMET)00:53

Olefin Metathesis Polymerization: Acyclic Diene Metathesis (ADMET)

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Acyclic diene metathesis polymerization or ADMET polymerization involves cross-metathesis of terminal dienes, such as 1,8-nonadiene, to give linear unsaturated polymer and ethylene. As ADMET is a reversible process, the formed ethylene gas must be removed from the reaction mixture to complete the polymerization process.
Similar to cross-metathesis, ADMET also involves the formation of metallacyclobutane intermediate by [2+2] cycloaddition of one of the double bonds of a terminal diene with...
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Polymer Classification: Architecture01:14

Polymer Classification: Architecture

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Polymers are classified as linear or branched on the basis of their chain architecture. The polymer chains in linear polymers have a long chain-like structure with minimal to no branching at all. Even if a polymer features large substituent groups on the monomer, which appear as branches to the skeleton, it is not considered a branched polymer. A branched polymer contains secondary polymer chains that arise from the main polymer chain. The branching occurs when the polymer growth shifts from...
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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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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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Hydrolysis01:15

Hydrolysis

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Overview
Hydrolysis is a chemical reaction in which the addition of water breaks down a polymer into its simpler monomer units. For example, peptides break into amino acids, carbohydrates into simple sugars, and DNA into nucleotides. Enzymes often facilitate these processes.
Hydrolysis Reverses Dehydration Synthesis
Complex carbohydrates can be broken down by breaking the bonds between individual sugar units. The reaction breaks a glycosidic bond as water is added to the compound. The...
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相关实验视频

Updated: Jun 12, 2025

Depolymerizable Olefinic Polymers Based on Fused-Ring Cyclooctene Monomers
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功能化低分子量聚乙烯的化学酶去聚合.

Thomas Oiffer1, Friedemann Leipold2, Philipp Süss2

  • 1Institute of Biochemistry, Dept. of Biotechnology and Enzyme Catalysis, University of Greifswald, Felix-Hausdorff Str. 4, 17487, Greifswald, Germany.

Angewandte Chemie (International ed. in English)
|September 24, 2024
PubMed
概括
此摘要是机器生成的。

研究人员开发了一种新型酶级联,用于去聚合低分子量聚乙烯 (PE),一种常见的塑料. 这种基于生物的方法为回收具有挑战性的多烯废物提供了一个有希望的新途径.

关键词:
贝耶维利格尔的氧化过程酶性降解 酶性降解在PE纳米颗粒中.聚乙烯聚乙烯的使用方法拉姆诺脂类是一种脂.mCPBABA 是一个很好的方法.

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Microwave-assisted Functionalization of Polyethylene glycol and On-resin Peptides for Use in Chain Polymerizations and Hydrogel Formation
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Microwave-assisted Functionalization of Polyethylene glycol and On-resin Peptides for Use in Chain Polymerizations and Hydrogel Formation

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Designed for Molecular Recycling: A Lignin-Derived Semi-aromatic Biobased Polymer
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Microwave-assisted Functionalization of Polyethylene glycol and On-resin Peptides for Use in Chain Polymerizations and Hydrogel Formation
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Designed for Molecular Recycling: A Lignin-Derived Semi-aromatic Biobased Polymer
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科学领域:

  • 聚合物化学 聚合物化学
  • 生物催化剂是一种生物催化剂.
  • 环境科学 环境科学

背景情况:

  • 聚乙烯 (PE) 是一种普遍存在的塑料,有助于全球浪费.
  • 聚乙烯的碳骨干的惰性性质阻碍了酶降解和生物催化回收.
  • 开发有效的PE废弃物回收方法仍然是一个重大挑战.

研究的目的:

  • 为了证明低分子量聚乙烯 (LMW PE) 的酶去聚合.
  • 探索一种多酶级联方法来分解PE废物.
  • 研究一种新的生物基聚烯回收策略.

主要方法:

  • 使用m-chloroperoxybenzoic acid (mCPBA) 和超声波进行LMW PE的化学预处理.
  • 酶去聚合利用一连串的催化酶-过氧化酶,酒精脱酶,贝耶维利格尔单氧化酶和脂酶.
  • 使用气体染色学-质谱学 (GC-MS) 和体重损失测定,分析聚合物转化.
  • 使用原子力显微镜 (AFM) 进行LMWPE纳米颗粒的表征.

主要成果:

  • 在格拉姆尺度实验中实现了大约27%的聚合物转化.
  • 形成中等尺寸的功能化分子,包括 ω-基碳酸和 α,ω-碳酸.
  • 酶去聚合导致mCPBA和酶处理的LMWPE纳米颗粒的尺寸减少.

结论:

  • 一个多酶催化系统,结合化学预处理,可以去聚合LMWPE.
  • 这种方法代表了开发聚烯废物的生物循环回收方法的新起点.
  • 该研究强调了酶策略在应对塑料废物挑战方面的潜力.